STH 8.66 W - Snow blower Kärcher - Free user manual and instructions

Product type	Thermal snow blower
Brand	Kärcher
Model	STH 8.66 W
Engine	Briggs & Stratton, 4-stroke, 250 cc
Rated power	6.0 kW / 8.2 PS
Working width	660 mm
Max. clearing capacity	2000 m²/h
Forward speeds	6
Reverse speeds	2 (R1 slow, R2 fast)
Dimensions (L×W×H)	1213 × 730 × 800 mm
Weight	100 kg
Fuel tank capacity	3.8 L (regular unleaded gasoline)
Engine oil quantity	0.83 L (SAE 30 / 5W30 / 0W30 depending on temperature)
Sound pressure level	98 dB(A)
Guaranteed sound power level	110 dB(A)
Vibrations (overall value)	5 m/s²
Ignition	Ignition key, choke, manual and electric starter (optional)
Safety devices	Coupling levers, protective grille, ejection flap
Maintenance	Oil change after 5h then every 25h, regular cleaning
Warranty	According to distributor conditions (see manual)

Frequently Asked Questions - STH 8.66 W Kärcher

What type of fuel to use for the Kärcher STH 8.66 W?

Use regular unleaded gasoline (recommended octane rating according to engine manual). The tank has a capacity of 3.8 L.

How to start the engine when cold?

Set the fuel valve to ON, the choke to ON, actuate the cold start aid (primer bulb) 2 to 7 times, then pull the starter cord quickly. For the electric starter, press the button for a maximum of 5 seconds.

What to do if the machine does not eject snow?

First check the shear bolts (they may be sheared). Then clean the auger and discharge chute, then check the coupling adjustment and the V-belt.

What engine oil to use and when to change it?

Use SAE 30 oil above 0°C, SAE 5W30 between 0°C and -18°C, SAE 0W30 below. First oil change after 5 hours, then every 25 hours (or 50 h in normal use).

How to adjust the direction and range of the snow stream?

Turn the crank or handle of the discharge chute to direct the stream. For range, use the lever (pos. 5) or manual button to raise/lower the ejection flap.

What are the essential safety precautions?

Always wear safety glasses and hearing protection, keep people/animals away. Stop the engine and remove the key and spark plug before any maintenance. Never refuel with a hot engine.

How to transport or store the snow blower?

Drain the fuel tank, let the engine cool down. For storage, clean the machine, oil the metal parts and store in a dry place. For transport, place it horizontally and secure it.

What to do in case of excessive vibrations?

Immediately stop the engine, remove the key and spark plug. Check that all screws and nuts are tight and that the auger is not damaged. Have it repaired by an authorized workshop if necessary.

How to maintain the track (if equipped)?

For tracked models, check the tension: the track should depress by 10-12 mm under hand pressure. To adjust, turn the nut (2) clockwise to tighten, counterclockwise to loosen.

Where to find spare parts and accessories?

Only use authorized genuine Kärcher parts. Spare shear bolts are sometimes supplied with the machine. Contact your dealer or an authorized service center.

USER MANUAL STH 8.66 W Kärcher

STH 8.66 W / STH 10.71 W / 13.84 W

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STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Bild 11 A

Please read and comply with these instructions prior to the

initial operation of your appliance. Retain these operating instructions for future reference or for subsequent possessors. In case of transport damage inform vendor immediately

Contents

Environmental protection 16

Overview 16

Symbols on the machine 16

Symbols in the operating instructions 16

Safety instructions 16

Safety Devices 17

Proper use 17

Before Startup 17

Start up 17

Operation 17

Transport 19

Shutdown 19

Maintenance and care 20

Troubleshooting 21

Technical specifications 23

Warranty 23

CE declaration 23

Environmental protection

	The packaging material can be recycled. Please do not throw the packaging material into household waste; please send it for recycling.
	Old appliances contain valuable materials that can be recycled; these should be sent for recycling.. Batteries, oil, and similar substances must not enter the environment. Please dispose of your old appliances using appropriate collection systems.
Pb	Please dispose off the normal or rechargeable batteries in an environment-friendly manner. Batteries and accumulators contain substances that must not enter the environment. Please dispose them off using appropriate collection systems.

Please do not release engine oil, fuel oil, diesel and petrol into the environment. Protect the ground and dispose of used oil in an environmentally-clean manner.

Overview

Device elements

Figure 1

1 Clutch bow/clutch lever for auger drive 2 Clutch lever for driving 3 One-way clutch lever, left 4 One-way clutch lever, right 5 Adjust the throw distance 6 Switching lever

Forward: Gears 1-5 (only STH 5.56),

gears 1-6

Reverse: R1 slow/R2 fast

7 Adjust throw direction 8 Spar handle

Figure 3

1 Ignition key 2 Choke 3 Cold start help (Tupfer) 4 Rope starter 5 Mains plug for electric starter 6 Starter knob 7 Gas lever 8 Ignition plug 9 Starter type plate

10 Fuel tap

11 Engine stop switch

Symbols on the machine

	Risk of burns! Keep safe distance from hot parts of the appliance.
	Wear eye and ear protection!
	Keep others out of the hazardous area!
	Risk of injury due to snow being thrown out or solid objects.
	Touch the parts of the appliance only when they have completely come to a standstill.
	Risk of injury on account of rotating parts. Keep hands and feet away from rotating parts.

	Only clean the discharge chute with cleaning utensils..
MAX 20 PSI MAX 1,4 BAR	Risk of explosion! Never exceed the max. tyre pressure of 1.4 bar/20 PSI.
	Switch the machine off prior to any work, such as adjustments, cleaning, testing and pull the spark plug.
	Gas lever position "fast"
	Gas lever position "slow"

Note

Keep these symbols on the machine legible at all times.

Symbols in the operating instructions

#

indicates an immediate threat of danger. Failure to observe the instruction may result in death or serious injuries.

Warning

indicates a possibly dangerous situation. Failure to observe the instruction may result in light injuries or damage to property.

Note

indicates useful tips and important information.

Safety instructions

The appliance should not be operated by persons below the age of 16 years (local conditions can specify the minimum age of the operator). - Please keep children and pets away from the hazardous zones of the appliance. - Please follow the national rules and regulations while operating the machine on public streets or paths. - Do not use the appliance to transport persons. Always wear gloves, ear protectors, safety goggles, tight winter clothing and firm shoes with anti-slip soles while working.

• Never use the appliance in closed rooms; do not tank up when the engine is hot or running.
• Do not bring any parts of the body or clothing near rotating or hot parts of the appliance.
• Switch off the engine; remove the ignition key and spark plug if you are not working with the appliance or are leaving the machine. The same applies while performing setting, maintenance, or repairs.
• Let the engine cool down before storing the appliance in closed rooms.
• Store the appliance and fuel in a safe place away from sources of fire (sparks, flames) and out of children's reach.
• Have the appliance repaired only by a specialized workshop.

Safety Devices

Safety devices serve to protect the user and must not be put out of operation or bypassed with respect to their function.

Clutch bow

(only STH 953 W)

When the user releases this lever, the auger drive will turn off and the machine will stop moving.

Clutch lever for snail drive

Not STH 953 W

The snail drive switches off when the user releases this clutch lever.

This lever can be stopped in a depressed state (not STH 5.56 W) if the user presses the clutch lever for travel drive and keeps it depressed. Both levers jump back as soon as the user releases the clutch lever for the travelling drive. The auger and travel drive are switched off simultaneously.

Clutch lever for driving

Not STH 953 W

The travel drive switches off when the user releases this clutch lever.

Safety grid in the discharge shaft

The safety grid prevents intervention in the discharge shaft.

Discharge flap

Figure 9

The discharge flap (2) prevents injuries from ejected objects.

Proper use

This appliance is only to be used for clearing snow from roads and other hard surfaces according to the descriptions and safety instructions given in this Instruction Handbook.

• Any other use is in contravention of the rules! Using the appliance in contravention of the rules or making any high-handed

changes to the machine will absolve the manufacturer from any warranty liability.

• The user is responsible for damages to third parties and their property caused by using the appliance.

Before Startup

Unpack the appliance and assemble it

Check the contents of the pack before unpacking. Assemble the appliance according to the instructions given at the end of this Instructions Handbook.

Start up

Danger

Risk of injury!

Before doing any work on the machine:

Switch off engine. Pull out the ignition key and the ignition plug. Allow engine to cool down.

Check the machine

Perform a visual inspection before each use. Check and ensure that all safety equipment, operator control elements and the corresponding clutch tensions/cables and screw fittings are not damaged and are tight. Replace damaged parts before operations. Not STH 953 W: Check clutches for snail and travel drive (see "Maintenance tasks"). STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W: Check switching lever (see "Maintenance tasks").

Check oil level

Check oil level; refill engine oil if required (see "Engine Instruction Booklet").

Refuelling

Danger

Risk of explosion and fire! - Only use the fuels specified in the Operations Manual of the engine manufacturer. - Do not refuel the machine in enclosed spaces. Smoking and naked flames are strictly prohibited. - Ensure that no fuel reaches the hot open surfaces. - Fuel up only when the engine is switched off and is cold. - Never tank up the fuel tank fully. Wipe off spilled fuel. - Store fuel only in suitable containers. Fuel up (for type of fuel see "Engine Instruction Booklet"); close the lid of the tank and wipe off fuel residues.

Check the tyre pressure

Not STH 953 W For transportation, the tyres may show a higher level of air pressure. Check air pressure in the tyres; adjust it if required (approx. 1 bar).

Adjust the machine to suit the snow and ground conditions

Setting the working position

(machines with track drive) Figure 4

Choose a suitable position using the adjustment lever (1). - Position I: For heavy and icy snow. The auger is pressed to the ground. - Position II: For normal snow conditions. - Position III: To clear uneven paths or to transport the machine. The auger has a greater distance to the ground.

Adjusting the clearing plate (only STH 953 W)

Figure 10

If the machine is sitting on even ground, the auger (1), clearing plate (2) and wheels (3) must touch the ground simultaneously.

-A clearing plate that is adjusted too high will cause the snow to be thrown to the rear. - A clearing plate that is positioned too low will wear faster. Tilt the appliance rearward. Loosen nuts (5). Adjust the clearing plate higher or lower (as required) and reattach. Tilt the machine backwards, check adjustment and repeat if necessary.

Adjusting the skids

Not STH 953 W

Figure 7

The landing skids (1) can be used to adjust the distance between the ground and the clearing plate (5) in such a way that no parts of the ground (such as soil or stones) are picked up.

Machines with track drive: Set the gear lever to position II. Loosen the nuts (2) on both sides of the appliance. Adjust the landing skids according to the underground surface: Set it lower for uneven or loose paths; higher for even roads and paths. Fasten the landing skids with nuts (2) in such a way that they uniformly touch the ground from the bottom.

Operation

Safety instructions

Danger

Risk of injury!

• Keep persons, especially children, and pets away from the hazardous zones.
• Operate the machine only in a safe and perfect working condition.
• Check the area where the machine is to be used and remove all objects that can get picked up and thrown out by the machine.
• Work only with adequate lighting.
• Only use the machine in walking speed.
• Work slowly and safely especially on uneven or loose paths and while reversing.
• Adjust the distance between the snail casing and the underground floor in such a way that the appliance does not pick up any foreign bodies (such as stones).

Danger

Risk of suffocation on account of carbon monoxide! Only operate the combustion engine while out in the open.

Note

Follow the national/ local regulations for the usage times (ask the local authorities, if required).

Danger

Long hours of using the appliance can cause circulation problems in the hands on account of vibrations.

It is not possible to specify a generally valid operation time, since this depends on several factors:

• Proneness to blood circulation deficiencies (cold, numb fingers). Low ambient temperature. Wear warm gloves to protect hands. A firm grip impedes blood circulation.
• Continuous operation is worse than an operation interrupted by pauses.

In case of regular, long-term operation of the device and in case of repeated occurrence of the symptoms (e.g. cold, numb fingers) please consult a physician.

Tips for clearing the snow

• Clear up immediately after the snowfall; otherwise, the lower layer becomes ice and makes clearing difficult.
• If possible, clear the snow in the direction of the wind.
• Clear the snow in such a way that the clearing tracks overlap a little.

Working on slopes

Danger

Risk of injury! Danger of tipping if gradient is too high. - Do not use the appliance on slopes with an inclination greater than 20%. - Work slowly and cautiously, especially while changing the direction of travel. - Drive up and down the slope - never diagonally to the slope. - Pay attention to hurdles - do not work close to the inclination.

Setting the direction and distance of throw

Figure 9

Danger

Risk of injury! Do not direct the flap (2) of the discharge shaft (3) towards persons, animals, windows, cars and doors.

Adjust throw direction

Not STH 953 W:

Bring the discharge shaft (3) to the desired direction by turning the crank (figure 1, item 7). Only STH 953 W: Move the discharge chute (3) into the desired direction using the handle (4).

Note

Do not use the handle (4) to lift the machine.

Adjust the throw distance

Deeper the flap (2), so much higher and farther will be the snow discharge.

Machines with lever: Press the lever (figure 1, item 5) towards the front to set the flap (2) higher and vice-versa. Machines without lever: Loosen the hand knob (1) and adjust the flap (2) higher/ lower as required.

Start the engine

Figure 3

Read the operating instructions of the engine manufacturer before start-up and follow the safety instructions carefully. Release the clutch bow/clutch lever for auger and travel drive before starting. Check tank contents and oil level; refill oil and fuel (see "Engine Instructions Booklet").

Note

Some models do not have a gas lever, the speed is adjusted automatically. The engine always runs with optimized speed.

Starting using rope starter

Set the fuel tank tap, if there is one, to "ON/OPEN". Insert the ignition plug into the spark plug. Not STH 953 W: Turn gas lever, if there is one, to "fast". On machines without gas levers, set the engine stop switch to "ON". Set the choke for cold start to "ON/CHOKE". Insert the ignition key into the ignition lock. Press cold start help (Tupfer) once; press it twice to seven times during cold weather (depending on the engine type). Pull the rope starter slowly till you feel the resistance and then give it a quick and hard tug. Do not allow the rope starter to recoil immediately - just let it go back slowly.

Reset the choke back to "RUN/OFF" in a step-by-step manner, if the engine is running.

Starting using electrical starter (optional)

Not STH 953 W

Danger

Risk of electric shock.

• Do not use the electric starter in the rain.
• Check whether the mains are secured with a leakage current protection switch. If not, get an electrician to install a suitable switch.

To connect the electrical starter to the mains, use only extension cables (not part of standard delivery) that have been approved for use in the open and have a safety conductor.

For example: for a max. length of 50 m

-H07RN-F 3x1.5 mm² up to -25 °C -H07BQ-F 3x1.5 mm² up to -40°C

Danger

Risk of electric shock.

• Prior to each engine start, check the extension cables and the cables/connectors on the engine for damage.
• Please arrange immediately for the exchange of damaged parts by a skilled electrician.
• Never start the machine with damaged parts.

Warning

Improper connection of the electrical starter can cause damage to the machine or to property in its vicinity. Check whether the mains are being operated according to instructions on the type plate of the starter and is protected with appropriate fuses.

Set the fuel tank tap, if there is one, to "ON/OPEN". Insert the ignition plug into the spark plug. Turn gas lever, if there is one, to "fast". On machines without gas levers, set the engine stop switch to "ON". Insert the ignition key into the ignition lock, do not turn it. First connect the extension cable to the mains and then connect it to the mains socket. Set the choke for cold start to "ON/CHOKE". Press cold start help (Tupfer) once; press it twice to seven times during cold weather (depending on the engine type). Press the starter button (max. 5 seconds) till the engine starts. Wait for at least 30 seconds before making a fresh start. Reset the choke back to "RUN/OFF" in a step-by-step manner, if the engine is running. First disconnect the extension cable from the mains and then from the electrical starter.

Putting/ changing gears

Not STH 953 W

Figure 1

Warning

Release the clutch lever for snail and travel drive before putting or changing a gear. Select the gear using the switch lever:

Forward: "1" (slow) to "5/6" (fast). Reverse: R1 slow/R2 fast.

Working with the appliance

Figure 1

Warning

Risk of damage!

• If the machine comes in contact with foreign objects (e.g. stones) or if there are unusual vibrations, switch off the machine and check the damage. Rectify the damage before starting to work again with the appliance.
• Let the engine warm up prior to using the machine. Only STH 953 W: Set the direction and distance of throw. Start the motor. Press the clutch bow and hold it. The auger is driven. The machine will move forward when the auger touches the ground. Increasing the travel speed: Raise the spar handle slightly. The auger will have better ground traction and will drive the machine forward faster. If repeated frequently, this will cause a more rapid wear of the rubber lip on the auger. Decreasing the travel speed: Press the spar handle downward. Not STH 953 W: Set the direction and distance of throw. Start the motor. Select the forward gear after releasing the clutch levers for snail and travel drives. Press the clutch lever for snail drive and keep it depressed. The snail and the throwing turbine will start up. Press the clutch lever for travel drive and keep it depressed. The appliance will move and clear the snow. The clutch lever for auger drive remains locked till this lever remains depressed (not STH 5.56 W) and can now be released. To change the gears, first release the clutch lever for travel drive and then use the switching lever for changing the gears. Machines with freewheeling levers: The machine can be lowered more easily using the freewheeling levers. To the right: Pull on the right freewheeling lever. To the left: Pull on the left freewheeling lever.

Stopping the engine

Figure 3

To avoid damage to the appliance and prevent starting problems due to humidity, let the engine run for a few minutes before switching it off (so that it gets dried). Not STH 953 W: Turn gas lever, if there is one, to "slow". On machines without gas levers, set the engine stop switch to "OFF".

Pull out ignition key.

Turn fuel tap, if there is one, to "OFF/CLOSE".

Remove the blockages from the snail or the discharge shaft

Danger

Risk of injury!

Before doing any work on the machine:

• Switch off engine.
• Wait till all the moving parts have come to a stand-still.
• Pull out the ignition key and the ignition plug.

Figure 13

Remove the blockages using a plastic plunger or a shovel.

Snow chains (optional)

Snow chains can be purchased and used if the weather conditions are extreme.

Transport

Drive the machine

For maneuvering/ travelling short distances.

Start the appliance. Select a forward or reverse gear. Press the clutch lever for travel drive and keep it depressed. Drive the machine carefully.

Transport without self-drive

Danger

Risk of injury!

Before doing any work on the machine:

Switch off engine. Pull out the ignition key and the ignition plug. Allow engine to cool down. Empty fuel tank. Transport the machine on or in a vehicle in the horizontal position. Secure the machine against slippage or from rolling off.

Shutdown

Danger

Risk of explosion!

Smoking and naked flames are strictly prohibited. - Ensure that no fuel reaches the hot open surfaces.

Please follow these instructions if the machine is not to be used for more than one month:

Prepare the engine (see "Engine Instruction Booklet"). Empty fuel tank. Clean the device. Wipe all metallic parts with an oily cloth to protect them against rusting or spray some oil on them. Store the machine in a clean and dry room.

Maintenance and care

Maintenance schedule

Once in the season:

• Get the machine checked and serviced in an authorised workshop.

Every time before use:

• Check oil level; refill engine oil if required (see "Engine Instruction Booklet").
• Check whether all screw joints are tight; tighten them, if necessary.
• Check safety equipment.
• For machines without electric starter: Check the cables and connectors on the engine.

Maintenance tasks After using	for	25 h 50 h	after the	season	depending on requirements
Clean the discharge shaft, snail and snail casing. x
Oil change 3)			x 4)
Lubricate all moving and rotating parts x x
Clean the spark plugs 1)		x
Get the spark plugs replaced 2)				x
Check air pressure in the tyres; increase it, if required x x
Clean the exhaust and the air cooling system 1)	x				x
Check clutch setting; readjust, if required x
Get the carburetor settings checked 2)					x
Check clearing plate; replace worn out clearing plate x
Check landing skids; replace worn out landing skids in pairs x
Check track, adjust if necessary, replace defective track if required					x
Replace tank lock x
Get the exhaust checked 2)					x

See "Engine Instruction Booklet" 2) Get these jobs done only from an authorised workshop 3) First oil change after 5 operating hours (h) 4) Change oil every 25 operating hours (h) if the machine is operated under heavy load or if the ambient temperature is high

Maintenance Works

△ Danger

Risk of injury! Before doing any work on the machine: - Switch off engine. - Pull out the ignition key and the ignition plug. - Allow engine to cool down.

Accessories and Spare Parts

Only use accessories and spare parts which have been approved by the manufacturer. The exclusive use of original accessories and original spare parts ensures that the appliance can be operated safely and troublefree.

Cleaning the device

→ Park the machine on solid, even and horizontal ground. → Remove dirt that is stuck. → Clean the machine by letting in flowing water through the discharge shaft and let it dry. → Clean the engine using cloth and brush.

Lubricate the machine

Lubricate all rotating and moving parts with some light oil.

Adjust the air pressure in the tyres (Not STH 953 W)

△ Danger

Risk of explosion! Never exceed the max. tyre pressure of 1.4 bar/20 PSI.

Recommended air pressure is approx. 1 bar

Maintenance jobs for the engine

See "Engine Instruction Booklet".

Adjust the clutch for the snail drive (Not STH 953 W)

Figure 2

Check clutch status:

Press the left clutch lever (1) forward (direction I); at the same time press the rubber (3) downward. The clutch tension (5) must be reduced. Otherwise loosen it (see "Changing the setting of the clutch tension"). Release clutch lever (1). Clutch tension (5) must be without tolerance but should also not be too tight. Else change the setting (see "Changing the clutch tension"). It should be possible to press down the clutch lever (1) completely. Otherwise, the clutch tension is too high and must be reduced (see "Changing the clutch tension").

Addition checks (see "Working with the appliance"):

Turn the auger drive on for 10 seconds with the engine running. Release the clutch lever, the auger must stop rotating.

Adjust the clutch for the travel drive (Not STH 953 W)

Figure 1

Machines with track drive: Set the gear lever to position III. Set the switching lever to the fastest forward gear (highest number). Push the machine forward after releasing the clutch lever for travel drive. While pushing, set the switching lever to the fastest reverse gear and then to the fastest forward gear. If you feel any resistance during pushing or changing the gears, reduce the clutch tension (see "Changing the clutch tension setting"). While pushing the machine, keep the clutch lever of the travel drive depressed. The wheels/tracks must be locked. Otherwise tighten the clutch tension (see "Changing the setting of the clutch tension"). If the setting is still not complete or is doubtful, see "Check travel drive".

Changing the clutch tension setting (Not STH 953 W) Figure 2

For clutch tensions with adjustable covers (6): Tightening: Loosen nuts (7) and screw in the adjustable covers (6). Loosening: Loosen adjusting covers (6) and screw in the nuts (7) in the opposite direction. For clutch tensions with release spring (8): Before doing the setting, remove the spring and then reinsert it. The clutch tension is correct when the spring expands 2-3 cm while coupling. Tightening: Screw the safety nut (9) upward. Loosening: Screw the safety nut (9) downward. For clutch cables with adjustment plates for travel drive (10) or for auger drive (11): Tightening: Loosen screw (A) depending on the adjustment plate, slide adjustment plate down and reattach the screw (A). Loosening: Loosen screw (A) depending on the adjustment plate, slide adjustment plate up and reattach the screw (A).

Checking the travel drive (not STH 953 W)

Figure 12

Warning

Risk of damage to the machine! While tilting the machine, ensure that it retains its balance and no fuel or oil in the air filter leaks into the engine compartment or to the outside.

Loosen the screws of the frame; tilt the device forward, if required. Release the clutch lever for travel drive and shift to all gears; while doing so, the friction wheel (2) should not touch the drive disc (3). Otherwise loosen coupling tension (see "Changing the clutch tension setting"). Press the clutch lever for travel drive in each gear; the friction wheel must always touch the drive disc. Otherwise tighten the clutch tension (see "Changing the clutch tension setting"). Clean the drive disc and rubber on the friction wheel, if required; they should be grease-free. Remove ice pieces, if any.

Tensioning the V-belt of the auger (only STH 953 W)

Figure 5

If the auger runs unevenly while the engine speed remains constant, the V-belt (5) must be retensioned. If there is an additional boring (3b) on the clutch lever (1), hook the clutch cable (2) into the upper boring (3b).

If there is no additional (upper) boring or if it is already being used, visit an authorized workshop.

Setting the switching lever (STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Figure 11 A

(Machines with switching rod)

Remove spring pin (4) and underlying disc (5), remove the spindle nut (6) from the hole (7). Press the switch arm (2) downward; set the switching lever (3) to gear "6". Turn the spindle nut (6) in such a way that the pin can be inserted in the same whole (7). Secure the spindle nut with an underlying disc and spring pin.

Figure 11 B

(Machines with switching tension) Set the switching lever (3) to the fastest forward gear. Loosen screw (A) and press the holder downward till the switching tension is tight. Now tighten screw (A) again. Check correct setting.

Note

This setting is required only if the fastest gear (forward or reverse) cannot be engaged.

Adjusting the track belt (machines with track drive)

Figure 6

The track belt (1) is adjusted correctly if it can be deflected 10-12 mm by hand. Otherwise, it has to be readjusted.

Position the machine on an even and horizontal surface so that the tracks no longer touch the ground. Turn the nut (2) until the track belt has the correct tension. Clockwise direction: Tighten. Anticlockwise direction: Loosen.

Replacing the track belt (machines with track drive)

Figure 6

Position the machine on an even and horizontal surface so that the tracks no longer touch the ground. Turn the nut (2) anticlockwise until the track belt can be removed. Replace the track belt. Retension the new track belt using the nut (2) (see "Adjusting the track belt").

Replacing shearing bolts

Not STH 953 W

Figure 8

The auger (3) is fastened to the drive shaft (4) using shearing bolts (1) and locknuts or splints (2). The bolts are designed in such a way that they break (shear off) when the snail comes in contact with foreign bodies. This protects the machine against damages. These parts should only be replaced by original spare parts (Spare bolts and lock nuts or splints are included as options in standard delivery, part W).

Remove broken bolts (1) and locknut or splint (2); clean and lubricate the fastening point. Use new shearing bolt and new locknut or splint.

Replacing the clearing plate

Only STH 953 W:

Figure 10

Tilt the appliance rearward. Remove screws (4) and nuts (5). Replace the clearing plate (2). Fasten new clearing plate to the casing using screws and nuts. Tilt the machine backwards, check (see "Adjusting the clearing plate").

Not STH 953 W:

Figure 7

Remove screws (6), underlying discs (7) and nuts (8). Replace the clearing plate (5). Fasten new clearing plate to the casing using screws, underlying disc and nuts.

Replacing the landing skids (Not STH 953 W)

Figure 7

Remove nuts (2), underlying discs (3) and screws (4). Loosen the landing skids (1) on both the sides of the casing. Adjust the new landing skids (see "Adjusting the landing skids").

Troubleshooting

Danger

Risk of injury! Before doing any work on the machine: - Switch off engine. - Pull out the ignition key and the ignition plug. - Allow engine to cool down.

Note

Some of the functioning problems have simple causes and you can rectify them easily. Call up an authorised workshop in case of doubt or if mentioned explicitly.

Note

Repairs should only be done by authorized workshops using original spare parts.

Troubleshooting

Fault Possible cause	Remedy of whom
Engine does not start	Fuel tank empty. Refill the fuel tank. Operator
	Fuel idling for a long time. Remove the old fuel in a	suitable container in the open (See "Engine Instruction Booklet"). Fill up the tank with clean, fresh fuel.	Operator
	Engine in cold state; choke not set to "ON/CHoke".	Set the choke to "ON/CHoke". Operator
	Gas lever no set to "fast" (not STH 953 W).	Set the gas lever to "fast".	Operator
	Engine stop switch not set to "ON" (machines without gas levers).	Set the engine stop switch to "ON". Operator
	Ignition plug not inserted. Insert the ignition plug into the spark plug. Operator
	Spark plug is dirty. Clean the spark plug (see "Engine Instruction Booklet").	Customer	Operator
	Spark plug is defective. Replace the spark plug.	and ventilation hole. Operator
	Carburetor is overflowing.	Adjust the carburetor.	Customer Service
Engine is running erratically	Choke set to "ON/CHoke".	Choke set to "RUN/OFF".	Operator
	Ignition plug is loosely inserted.	Fix the spark-plug connector properly.	Operator
	Fuel idling for a long time. Water or dirt in the fuel system.	Remove the old fuel in a suitable container in the open (See "Engine Instruction Booklet"). Fill up the tank with clean, fresh fuel.	Operator
	Ventilation hole in tank lid blocked. Clean tank lid	and Vibration hole.	Customer Service
	Carburetor out of alignment.	Adjust the carburetor.	Customer Service
Machine does not clear snow	Shearing bolts torn off.	Replace shearing bolts (see "Replacing shear-ing bolts").	Operator
	Snail or discharge shaft is blocked.	Stop the engine, pull out the ignition plug. Remove the blockage.	Operator
	Clutch tension for snail drive is not set properly.	Set clutch tension (see "Setting clutch for snail drive").	Operator
	V-belt loose.	STH 953 W: Tension the V-belt (see "Tensioning the V-belt of the auger").	Operator
		Not STH 953 W: Tighten V-Belt.	Customer Service
	V-belt torn.	Replace V-belt.	Customer Service
Machinen does not run (not STH 953 W)	Clutch tension for travel drive is not set properly.	Adjust clutch tension (see "Setting the clutch for travel drive").	Operator
	V-Belt is loose or torn.	Tighten the loose V-Belt. Replace torn V-Belt.	Customer Service
	Travel drive is coated with ice.	Remove the ice (see "Check travel drive").	Operator
	Friction wheel rubber is torn.	Replace friction wheel rubber.	Customer Service
Excessive vibration	Loose parts or damaged snail.	Stop the engine immediately, pull out the ignition plug. Tighten loose screws and nuts. Repair damaged snail.	Customer Service
Gears can be switched with great difficulty (not STH 953 W)	Clutch tension for travel drive is not set properly.	Adjust clutch tension (see "Setting the clutch for travel drive").	Operator
	Gear lever not adjusted correctly (not STH 5.56 W).	Check switching lever (see "Setting the switching lever").	Operator
	Travel drive is coated with ice.	Remove the ice (see "Check travel drive").	Operator

Information about engine

The engine manufacturer assumes liability for all engine-related problems as regards output, output measurement, technical data, warranty and servicing. For further details, please refer to the separate holder/operator manual of the engine manufacturer.

Technical specifications

		STH 953 W	STH 5.56 W	STH 8.66 W	STH 10.66 W	Crt	STH 10.71 W	STH 13.84 W
Part no.:	--	1.332-101	1.335-101	1.335-201	1.335-302	1.335-203	1.335-204
Type -- Snow clearer		with wheels	Snow clearer with wheels	Snow clearer with wheels	Snow clearer with track belt	Snow clearer with wheels	Snow clearer with wheels
Motor -- MTD, 4-		stroke	MTD, 4- stroke	B&S, 4- stroke	B&S, 4- stroke	B&S, 4- stroke	B&S, 4- stroke
Rated power	kW/HP	2,0/2,7	3,5/4,8	6,0/8,2	7,5/10,2	7,5/10,2	9,7/13,2
Cylinder capacity	cm3	123	179	250	305	305	342
Operating speed	1/min	3600	3600	3550	3600	3550	3400
Capacity of fuel tank, normal petrol (unleaded)	I	1,9	1,9	3,8	3,8	3,8	7,6
Working width	mm	530	560	660	660	710	840
Working speed	km/h	Step speed	Step speed	Step speed	Step speed	Step speed	Step speed
Surface area, max.	m2/h	1700	1700	2000	2000	2200	2500
Length	mm	768	1111	1213	1257	1213	1492
Width	mm	578	629	730	749	781	959
Height	mm	645	800	800	851	800	864
Weight	kg	36	80	100	98	102	135
Amount of oil	I	approx. 0.6	approx. 0.6	approx. 0.83	approx. 0.83	approx. 0.83	approx. 0.83
Oil types above 0 °C	--	SAE 30	SAE 30	SAE 30	SAE 30	SAE 30	SAE 30
Oil types below 0 °C	--	SAE 5W30	SAE 5W30	SAE 5W30	SAE 5W30	SAE 5W30	SAE 5W30
Oil types below -18 °C	--	SAE 0W30	SAE 0W30	SAE 0W30	SAE 0W30	SAE 0W30	SAE 0W30
Noise emission
Sound pressure level (EN 60704-1)	dB(A)	92	92	98	98	94	98
Guaranteed sound power level (2000/14/EC)	dB(A)	104	104	110	110	106	110
Machine vibrations
Vibration total value (ISO 5349)
Upper limbs	m/s2	5	5	5	5	5	5

Warranty

The warranty terms published by our competent sales company are applicable in each country. We will repair potential failures of your appliance within the warranty period free of charge, provided that such failure is caused by faulty material or defects in fabrication. In the event of a warranty claim, please contact your dealer or the nearest authorized Customer Service center. Please submit the proof of purchase.

CE declaration

We hereby declare that the machine described below complies with the relevant basic safety and health requirements of the EU Directives, both in its basic design and construction as well as in the version put into circulation by us. This declaration shall cease to be valid if the machine is modified without our prior approval.

Product: Snow clearer

Type: 1.332-xxx, 1.335-xxx

Relevant EU Directives

98/37/EC

89/336/EEC (+91/263/EEC, 92/31/EEC,

93/68/EEC)

2000/14/EC

Applied harmonized standards

EN ISO 12100-1

EN ISO 12100-2

EN ISO 14982

ISO 8437

Applied conformity evaluation method

Appendix V

Sound power level dB(A)

STH 953 W

Measured: 102

Guaranteed: 104

STH 5.56 W

Measured: 102

Guaranteed: 104

STH 8.66 W

Measured: 108

Guaranteed: 110

STH 10.66 W Crt

Measured: 108

Guaranteed: 110

STH 10.71 W

Measured: 104

Guaranteed: 106

STH 13.84 W

Measured: 108

Guaranteed: 110

5.957-646

The undersigned act on behalf and under the power of attorney of the company management.

Type: 1332-xxx, 1335-xxx

89/336/EEC (+91/263/EEC, 92/31/EEC, 93/68/EEC)

2000/14/EC

1.332-xxx, 1.335-xxx

(STH 8.66 W, STH 10.66 W Crt, STH

10.71 W, STH 13.84 W)

Fig. 11 A

(Machine with gear lever)

Type: 1.332-xxx, 1.335-xxx

Applicable EC directives

98/37/EC

89/336/EEC (+91/263/EEC, 92/31/EEC,

93/68/EEC)

2000/14/EC

Adjusting the base plate

(Only STH 953 W)

Figure 10

When the machine is on a level surface, the auger (1), bottom plate (2), and wheels (3) should all touch the ground at the same time.

Adjust the skid shoes.

(Not STH 953 W)

Figure 7

Adjust the drive clutch

(Not STH 953 W)

Figure 1

-> Machines with tracks: Set the adjustment handle to position III. -> Set the throttle to the fastest forward (highest number). -> Push the machine forward with the drive clutch lever released.

STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Fig. 11 A

Type: 1332-xxx, 1335-xxx

89/336/EEC (+91/263/EEC, 92/31/EEC,

93/68/EEC)

2000/14/EC

Applicable standards

EN ISO 12100-1

EN ISO 12100-2

EN ISO 14982

ISO 8437

Method used for conformity assessment

Annex V

Lydeffektnivà dB(A)
STH 953 W
Målt:	102
Garanteret:	104
STH 5.56 W
Målt:	102
Garanteret:	104
STH 8.66 W
Målt:	108
Garanteret:	110
STH 10.66 W
Crt
Målt:	108
Garanteret:	110
STH 10,71 W
Målt:	104
Garanteret:	106

STH 13,84 W
Malt:	108
Garanteret:	110

5.957-646

(STH 8.66 W, STH 10.66 W Crt, STH 10.71

W, STH 13.84 W)

Figure 11 A

(Unit with coupling rod)

Forward: 1" (slow) - 5/6" (fast) Backward: R1-slow/R2-fast

(STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Figure 11 A

Danger of injury from jets of ejected solid objects.

Approach the apparatus only when it has completely stopped.

Danger of injury from rotating parts. Do not keep hands near rotating parts.

Clean the ejection chute only with the use of cleaning tools.

Explosion hazard! The maximum air pressure must not exceed 1.4 bar.

Switch off the device after all work, such as installation, cleaning, inspection, etc., and remove the spark plug connector.

Position of the throttle lever "fast"

Position of the throttle lever "slow"

Note

Hold the symbol device in disassembled state.

Symbols in the operating manual

Danger

Indicates an imminent dangerous situation. Failure to follow the instructions can lead to death or the most serious injuries.

Warning

Indicates a potentially dangerous situation. Failure to follow the instructions can cause minor injuries or damage to material assets.

Instruction

Read the safety information before use.

Safety instructions

- The device must not be operated by persons under 16 years of age (local rules may set a minimum user age). Do not allow children, especially small children, or animals into the danger zone. - Observe applicable national regulations when the device is used in public places and roads. - Transporting persons on the device is prohibited. During work, wear gloves, hearing protection, safety glasses, snug-fitting work clothing, and sturdy boots with non-slip soles. - Never operate the device in an enclosed space while the engine is running or hot. Never bring any part of the body or clothing close to rotating parts of the device. Stop the engine, remove the spark plug cap, and remove the spark plug cap when not working with the device or when leaving it. The same applies to adjustment, maintenance, and repair work. - Before placing the device in an enclosed space, let the engine cool down. Place the device and fuel in a safe place, away from sources of ignition (sparks, flames) and out of reach of children. - Repair of the device must only be carried out by a specialized service center.

Safety devices

Safety devices serve to protect the user and must not be removed from operation or bypassed in their function.

Clutch lever

(Only for STH 953 W)

When the operator releases the clutch lever, the drive clutch engages and the device stops.

Clutch lever for drive

(Not for STH 953 W)

The drive disengages when the user releases this clutch lever.

This lever can be locked in the engaged position (except for STH 5.56 W) when the user presses and holds the drive clutch lever. As soon as the user releases the drive clutch lever, both levers spring back. The drive and blade are disengaged simultaneously.

Clutch lever for blade

(Not for STH 953 W)

The lever locks automatically when the user releases this lever.

Protective grille in the ejection chute

The protective grille prevents penetration into the ejection chute.

Ejector valve

Fig. 9

The ejector valve (2) protects against damage that may occur during the ejection of materials.

Intended use

This device is intended exclusively for use as a snow blower, for removing snow from roads and hard surfaces, in accordance with the descriptions and safety rules given in this operating manual.

Any other use is considered improper! - Use of the device not in accordance with its intended purpose, unauthorized modifications to the device, exclude the manufacturer's liability. - The user is liable for damages that occur to third parties or their property as a result of using the device.

Preparations for work

Unpacking and assembling the device

When unpacking, check the contents of the packaging. Assemble the device as shown in the chapter of this manual.

Starting work

Danger

Danger of injury! Before all work with the device:

Turn off the device. Pull out the key. Remove the cap. Turn it off. → Give the device to the operator to rest.

Device check

→ Perform a visual check of the switching operation. Check for damage and tightness of the protective devices, control elements, and their cables/cables, as well as all screw connections. → Before operation, replace all damaged parts. Do not use the device if...

Check the engagement of the worm and idle drive (see "Maintenance work").

→STH8.66W, STH10.66WCrT, STH 10.71W, STH13.84W: Check the switch lever (see "Maintenance work").

Oil level check

→ Check the oil level, top up if necessary (see "Engine Manual").

Refueling

Danger

Explosion and fire hazard!

• Only use the fuel specified by the manufacturer in the engine operating manual.
• Refueling in closed rooms is not permitted.
• Ensure ventilation and avoid open flames. Make sure that fuel does not spill onto hot surfaces.
• Only refuel with the engine switched off and cold. Never refuel with the engine running. Do not spill fuel. Store fuel only in approved containers intended for fuel. Refuel (fuel type see Engine Manual), close the cap and wipe off any fuel residue.

Check tire pressure

(He STH 953 W)

During transport, the air pressure in the tires may be higher. → Check the tire pressure and adjust if necessary (approx. 1 bar).

Adjust the device according to the snow and surface conditions.

Set the working position (lever to caterpillar track)

Fig. 4

Select the working position using the adjusting lever (1). Position I: for hard and frozen snow. Press the skid to the ground. - Position II: for normal snow conditions. - Position III: for uneven surfaces or for transporting the device. Greater distance from skid to ground.

Install the scraper blade (only STH 953 W)

Fig. 10

When the device stands on a level surface, the skid (1), scraper blade (2) and wheels (3) must all touch the ground at the same time.

- If the scraper blade is set too high, it may throw snow backwards. - If the scraper blade is set too low, it will wear out quickly. Tilt the device backwards. → Loosen the nuts (5). → Set the scraper blade higher or lower and retighten. Tilt the device back, check the setting and repeat if necessary.

Adjusting the skids (not STH 953 W)

Fig. 7

With the skids (1), the distance between the ground and the scraper blade (5) can be set so that parts of the ground (e.g., soil or stones) are not picked up.

→ Devices with caterpillar track: set the adjusting lever to position II. Loosen the nuts (2) on both sides of the device. → Set the skids depending on the ground surface: lower for uneven or loose surfaces, higher for even surfaces. → Tighten the skids with the nuts (2) so that the skids just touch the ground surface from below.

Control

Safety instructions

Danger

Danger of injury!

Do not allow people, especially children, and animals into the working area. - Operate the device only in perfect and safe condition. - Check the area where the device will be used and remove all objects that could be caught up and thrown by the device. Work only in sufficient lighting. - Move the device only at walking speed. - Work slowly and carefully, especially on uneven or unsecured ground or when reversing. - Maintain a distance between the housing of the transmission and

the ground surface so that no foreign objects (e.g., stones) are thrown out of the device.

Danger

Danger of suffocation from exhaust gas! The internal combustion engine may only be used in the open air.

Note

Observe national/community regulations regarding operating times (otherwise check with the competent authority).

Danger

Prolonged use of the device may lead to circulatory disorders in the hands caused by vibration.

It is impossible to specify the exact duration of use of the device, as this depends on several factors:

- Personal predisposition to poor blood circulation (cold fingers, tingling in the fingers). Low ambient temperature. Wear warm gloves to protect your hands. - Poor grip strength. - Continuous work is worse than work with breaks.

If the device is used repeatedly and the corresponding signs appear (e.g., tingling in the fingers, cold fingers), we recommend a medical examination.

Snow removal tips

• Remove snow immediately after it falls; later, layers of snow will make removal work more difficult.
• If possible, remove snow in the direction of the wind.
• Remove snow in such a way that the cleared strips overlap slightly.

Working on slopes

Danger

Danger of injury! Danger of the device tipping over on slopes that are too steep.

Do not use the device on slopes with an incline of more than 20%. Work with increased caution, especially when changing direction of movement. Move the device up or down the slope, not across it. Pay attention to obstacles, do not work near edges.

Setting the throwing distance and direction

Fig. 9

Danger

Danger of injury! Do not set the deflector (2) of the ejection chute (3) in the direction of people, animals, windows, machines, and trees.

Setting the ejection direction

Only for STH 953 W:

→ Set the ejection chute (3) to the desired direction by turning the handle (Fig. 1, item 7). Only for STH 953 W: → Set the ejection chute (3) to the desired direction by turning the handle (4).

Note

Do not use the device for lifting.

Setting the ejection distance

The higher the cover (2) is set, the farther the snow will be thrown.

With handle:

→ Press the lever forward (Fig. 1, item 5) to set the cover (2) higher and vice versa. Without handle: → Release the button (1) and set the cover (2) to the desired height.

Starting the engine

Fig. 3

→ Before operating, read the engine manufacturer's manual for use and pay particular attention to safety rules. → Before starting, release the clutch lever for the drive and the clutch lever for the auger. → Check the fuel tank contents and oil level, add oil and fuel if necessary (see "Engine Manual").

Note

On some models, the throttle lever speed is set automatically. The engine always runs at optimal speed.

Starting with the recoil starter

→ Turn the fuel valve to the "ON/OPEN" position if available. Install the spark plug cap on the spark plug. Do not touch the spark plug.

Set the throttle lever, if available, to "FAST". For units without a throttle lever, set the engine stop switch to "ON".

→ With the recoil starter, set the choke to "ON/CHOKE". Insert the key into the ignition switch. Press the primer bulb once for a cold start, or up to seven times for a cold engine (depending on engine type). → Slowly pull the starter rope until resistance is felt, then pull it quickly and firmly. Do not let the starter rope snap back; guide it back slowly. → When the engine starts, gradually move the choke to the original position, "RUN/OFF".

Starting with the electric starter (optional) (not for 953 W)

Danger of poisoning.

Do not use the electric starter during rain. Check that the electrical circuit is protected by an automatic circuit breaker. Otherwise, call an electrician so that the installation meets the automatic circuit breakers.

To connect the electric starter to the mains, use only extension cords (not included) that are suitable for outdoor use and have a protected connection.

For example, up to a maximum length of 50 m: - H07RN-F 3x1.5 mm² up to 25 °C - H07BQ-F 3x1.5 mm² up to 40 °C

Danger

Danger of poisoning.

• Before starting the engine, check the starter cable and the starter housing for damage. Damaged parts must be replaced immediately by a qualified electrician. Never start the device with damaged parts.

Prevention

If the electric starter is connected improperly, damage may occur to the device or its surroundings. Check that the electrical circuit is operated according to the specifications on the starter's nameplate and is protected by the appropriate fuse.

→ Turn the fuel tap to the "ON/OPEN" position if available. → Install the spark plug cap on the spark plug. → Set the throttle lever, if present, to the "fast" position. For devices without a throttle lever

Set the stop switch to the "ON" position. Insert the key into the ignition lock, but do not turn it. → Connect the extension cord first to the device's connector, then to the wall outlet. → On the way to the start, set the air choke to the "ON/CHOKE" position. Press the auxiliary start aid (primer) once, for a cold engine from one to three times (depending on engine type). → Hold the starter button pressed for as long as necessary (max. 5 seconds) until the engine starts. Before a repeated start attempt, wait at least 30 seconds. → When the engine is running, gradually move the air choke to the original position, "RUN/OFF". → Disconnect the extension cord from the mains first, then from the electric starter.

Engaging/disengaging the drive

(Not for model 953 W)

Fig. 1

The machine is designed for forward and reverse movement before engaging or disengaging the transmission.

Select the gear ratio for the transmission:

Forward: 1" (slow) to 5/6" (fast) Reverse: R1-slow/R2-fast

Working with the machine

Fig.1

Danger of damage!

When the machine is tilted and foreign objects (for example, stones) or when there are strong vibrations, it should be turned off and checked for damage. Before continuing to work with the machine, eliminate any detected damage. - Before starting operation of the device, the engine must be checked. Only these 953 W: Setting the throw distance and direction. Start the engine. Press and hold the clutch lever. The lever is activated by the ground contact. The lever brings the device into motion. → Increase in movement speed

Press the handle down. The lever improves ground contact and allows the device to move faster. This, with more frequent repetition, leads to accelerated wear of the rubber gasket of the lever.

Switching the machine

Maneuvering/overcoming short sections.

Start the device. Select forward or reverse gear. Press and hold the clutch lever of the drive. → Slowly move the device.

Transport without its own drive

Danger

Danger! Before operating the device:

Turn off the engine. Remove the ignition key and remove the spark plug cap. → Let the engine cool down. Drain the fuel tank. → Transport the device on a transport vehicle, in a horizontal position. Secure the device against slipping or tipping.

Decommissioning

Danger

Explosion hazard!

• Do not tilt or turn the device over with the fuel tank open. Make sure that fuel does not spill onto hot surfaces.

If the device is not used for more than one month, perform the following steps:

→ Prepare the engine (see engine manual). Drain the fuel tank. Clean the device. → Protect against rust: wipe all metal parts with an oil-soaked cloth and apply oil to them. → Store the device in a dry and clean room.

Maintenance and technical service

Motor oil (4) during operation with

high load or high

ambient temperature

Technical service

maintenance work

Danger

Before starting the device:

- Turn off the engine.

Remove the ignition key and then the spark plug caps.

- Let the engine cool down.

Accessories and spare parts

Only use accessories and spare parts that have been approved by the manufacturer. Using original accessories and spare parts guarantees you reliable and trouble-free operation of the device.

Place the device on a hard, flat, and horizontal surface. Remove any dirt. Rinse the device with running water through the exhaust outlet and let it dry. Clean the motor with a damp cloth.

Lubricating the device

Lubricate all

rotating parts with oil.

Setting the pressure in the covers

(not for model 953 W)

Danger

The maximum air pressure must not exceed 1.4 bar.

The recommended air pressure in the covers is approximately 1 bar.

Engine maintenance

See "Engine Manual".

Adjusting the servo clutch

drive

(not ETH 953 W)

Fig. 2

Checking the clutch condition:

Press the clutch lever (1) forward (direction I), while pressing the rubber (3). The clutch play (5) should loosen slightly. If not, loosen it (see "Changing the clutch play"). Release the clutch lever (1). The clutch play (5) should have no play, but should not be too tight. If not, adjust the setting (see "Changing the clutch play"). →The clutch lever (1) must be pressed all the way down. Otherwise, the clutch play is too tight and must be loosened (see "Changing the clutch play").

Additional control (see

"Working with the device"):

→With the engine running, engage the servo drive for 10 seconds. Release the clutch lever; the reserve shaft can no longer rotate.

Adjusting the travel drive clutch

(not ETH 953 W)

→ With the engine running: set the lever to position III. → Switch the lever to a higher forward gear (higher number). Push the machine forward with the clutch lever released. While pushing, move the lever to the fastest forward gear, then to the fastest reverse gear. → If resistance is felt when pushing or shifting, reduce the track tension (see "Adjusting track tension"). Push the machine, press the clutch lever. The wheels/tracks should lock. If not, increase the track tension (see "Adjusting track tension"). → If adjustment is still not satisfactory or raises doubts, see "Checking the drive".

Adjusting track tension

(not these 953 W)

For the tension mechanisms with a coupling (6): → Tightening: pull the lever (7) and turn the coupling (6) in the opposite direction. Loosening: pull the coupling (6) and turn the lever (7) in the opposite direction. For the tension mechanisms with a release spring (8): → Before installing the spring, it must be unhooked, then hooked again. The tension mechanism is correctly set if, when the spring is released, it extends by 2-3 cm. → Tightening: turn the locknut (9) upward. Loosening: turn the locknut (9) downward. For the tension mechanisms with a threaded rod for the drive shaft (10) or for the final drive shaft (11): → Tightening: loosen (A) depending on the threaded rod, move downward

Set the adjusting plate and retighten screw (A). → Loosening: Loosen screw (A) depending on the adjustment, flip the adjusting plate up and retighten screw (A). (Not for STH 953 W) Danger of damage to the device! When tilting the device, pay attention that it maintains balance and that no oil or fuel leaks into the environment or outside. Tighten the screws on the frame housing, otherwise the device may tip over forward. → When the clutch lever is released, switch to all gears; the friction wheel (2) must not touch the drive disc (3). Otherwise, loosen the clutch tension mechanism (see "Adjusting the clutch tension" → On each gear, press the clutch lever; the friction wheel must be in contact with the drive disc. Otherwise, increase the clutch tension (see "Adjusting the clutch tension"). → If necessary, clean the drive disc and the friction wheel. In this case, free the front parts from dirt. (Only for STH 953 W) If the engine runs unevenly at idle speed, tighten the V-belt (5). → If the clutch lever (1) has an additional hole (3b), insert the clutch tension (2) into the hole located above (3b). → If the additional hole (located above) is absent or already in use, contact a specialized service. (STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W) (Devices with gear shift) → Remove the spring washer (4) and the flat washer (5), pull out the sliding pin (6) from the hole (7). → Press down the switch lever (2), set the shift lever (3) forward, "b".

Checking the sliding drive

Fig. 12

Warning

Tighten the V-belt of the milling disc

Fig. 5

Setting the shift lever

Fig. 11 A

→Turn the sliding pin (6) so that the hole (7) can be inserted. Secure the sliding pin with the flat washer and spring washer.

Fig. 11 B

(Devices with cable adjustment)

→ Set the shift lever (3) to the fastest forward gear. Loosen screw (A) and press down the holder until the cable is taut. Retighten screw (A). → Check the correct setting.

Note

This adjustment is necessary only if it is impossible to engage the highest gear (forward or reverse).

Adjust the track belt

The track tension is set correctly; it can be extended by 10-12 mm. Otherwise, it must be adjusted.

→ Install the device on a solid, horizontal surface so that the tracks do not touch the ground. → Turn the nut (2) until the track belt has the correct tension. Clockwise: Tension. Counterclockwise: Loosening.

Replace the track belt

Power, power measurement,

Technical data, warranty service.

More detailed information can be

found in the separately supplied

operator's manual for the

engine.

Technical data

Type: 1.332-xxx, 1.335-xxx

Essential directives EC 98/37/EC 89/336/EEC (+91/263/EEC, 92/31/EEC, 93/68/EEC) 2000/14/EC

Applied harmonized standards

EN ISO 12100-1

EN ISO 12100-2

EN ISO 14982

ISO 8437

Applied evaluation procedure

Annex V

Sound power level dB(A) STH 953 W

STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Fig. 11 A

(STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Fig. 11 A

89/336/EEC (+91 / 263 / EEC 92/31/EEC, 93/68/EEC)

2000/14/EC

Harmonized standards used

EN ISO 12100-1

EN ISO 12100-2

EN ISO 14982

ISO 8437

STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Figure 11 A

(machines with gear shift frame) → Remove the spring pin (4) and washer (5), take the spindle nut (6) out of the bore (7).

→ Press the shift arm (2) downwards, switch the shift lever (3) to gear "6". Turn the spindle nut (6) so that the pin can be inserted into the same bore (7). Secure the spindle nut with the washer and spring pin.

Figure 11 B

(machines with shift cable)

→ Switch the shift lever (3) to the fastest forward gear. → Loosen screw (A) and press the bracket downwards to tension the shift cable. → Retighten screw (A). Check the correct adjustment.

Warning

Type: 1.332-xxx, 1.335-xxx

Subject of EC directive:

98/37/EC

89/336/EEC (+91 / 263 / EEC 92/31/EEC, 93/68/EEC

2000/14/EC

STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Fig. 11 A

89/336/EEC (+91/263/EEC, 92/31/

EEC, 93/68/EEC)

2000/14/EC

(STH 8.66 W, STH 10.66 W Crt, STH

10.71 W, STH 13.84 W)

Fig. 11 A

(machines with levers)

-> Remove the locking plug (4) and the washer (5), and take the spindle nut (6) out of the bore (7). -> Press the lever (2) downwards and set the gear (3) to speed "6". Turn the spindle nut (6) until the extension can be inserted into the same bore (7). -> Secure the spindle nut with the washer and the spring plug.

Fig. 11 B

(machines with rope) Put the gearbox (3) into the highest forward speed.

-> Loosen screw (A) and press the holder downwards until the rope is tensioned. -> Retighten screw (A). -> Check that the adjustment is correct.

Note

This adjustment is only necessary if the highest speed (forward or reverse) cannot be engaged.

Type: 1.332-xxx, 1.335-xxx

STH 8.66 W, STH 10.66 W Crt, STH 10.71 W, STH 13.84 W)

Figure 11 A

STH 8.66 W/STH 10.71 W/STH 13.84 W

07.08.2007