Q: What fuel to use for the DOLMAR HT2360D hedge trimmer?

Unleaded gasoline 91 ROZ minimum is mandatory for the DOLMAR HT2360D. The high-efficiency 2-stroke engine is designed to operate with this fuel. You can use gasoline with a higher octane rating without risking engine damage. Mandatory mixture with 2-stroke engine oil: The engine only operates when diluted in a fuel-oil mixture. Use a quality TSC-3 2-stroke oil according to the following ratio: Ratio 50:1 with specified DOLMAR 2-stroke engine oil (1 liter gasoline + 20 ml oil) — MANDATORY ratio to ensure engine reliability Ratio 25:1 with professional quality 2-stroke oil from other manufacturers (1 liter gasoline + 40 ml oil) — strongly recommended if DOLMAR oil is unavailable Fuel preparation: In an approved container that meets local standards, first pour in all the oil with half of the required gasoline. Then add the remaining fuel. Shake the mixture vigorously before pouring it into the hedge trimmer's tank. Critical warning: Never use pure gasoline. Never improvise the proportions. An excessive amount of oil produces more combustion residues, clogs the exhaust channel and the catalytic converter, increases gasoline consumption, and reduces performance. An insufficient amount severely compromises the lifespan of the 2-stroke engine.

Q: How to adjust the carburetion of the DOLMAR PS-5105 chainsaw?

Before you begin , ensure that the engine is clean and free of debris. Wear appropriate protective equipment (gloves, safety glasses). The carburetion adjustment should be performed on a flat and stable surface. Most importantly, check that the chain does not rotate at idle: this is a crucial safety requirement. Your DOLMAR PS-5105 has three main adjustment screws: the S screw for idle, the L screw for low-speed acceleration, and the H screw for maximum speed. For optimal adjustment, start the engine and let it warm up for 3 to 5 minutes before beginning. Once the engine is warm, you can proceed with the adjustments. Idle adjustment (S screw) : Turn the S screw clockwise to increase the idle speed, or counterclockwise to decrease it. The engine should run smoothly and steadily. Important: the chain must absolutely not rotate at idle. If it does, reduce the idle with the S screw until it stops completely. Maximum speed adjustment (H screw) : Turn the H screw clockwise to increase the maximum speed. Adjust the H screw to the minimum according to the engine's technical specifications. Never exceed the maximum allowed speed. Once the maximum speed is reached, you will notice ignition interruptions: this indicates that the limit speed has been reached. Acceleration adjustment (L screw) : As soon as you operate the throttle, the engine should accelerate from idle to high speed without hesitation. Gradually unscrew the adjustment screw (L) by turning it counterclockwise until the engine accelerates well. After each adjustment, repeat the adjustment operations until you achieve a stable idle without chain rotation, smooth acceleration, and the correct maximum allowed speed. If you encounter difficulties or if the carburetor is clogged, consult an authorized DOLMAR dealer.

Question 1

How to troubleshoot if the hedge trimmer blades do not move?

Accepted Answer

Immediately stop the engine and wait for the blades to come to a complete stop before any intervention.

Checks to perform

Check the cutting angle lock - The DOLMAR MH246.4DF has a cutting angle adjustment (45° upwards, 90° downwards). Ensure that the lock engages properly and that the cutting unit is correctly positioned in its notches. If the lock is not properly engaged, the blades will not be able to turn.
Clean the blades of any debris - Check for twigs, grass, or foreign materials stuck between the blades or in the cutting mechanism. Even a small obstruction can completely immobilize the system.
Check the blade play - According to the manual, the play should be adequate. Loosen the nut with a wrench, then tighten the hex bolt until it locks. Re-tighten between ¼ and ½ turn for correct spacing. Too tight a play can block the blades.
Check the grease in the gearbox - The gearbox should be greased every 25 hours of use. Insufficient lubrication can prevent the transmission of movement to the blades.

If none of these checks resolve the issue, it may indicate a problem with the drive system or the motor itself. Contact an authorized DOLMAR service center for a professional diagnosis.

Question 2

How to change the drive belt of the DOLMAR TM-92.14 H?

Accepted Answer

Replacing the drive belt of the DOLMAR TM-92.14 H is a complex task that requires disassembly and delicate adjustments.

According to the official manual, this operation should be entrusted to an authorized DOLMAR service center. These centers have the expertise and specialized tools necessary to carry out the replacement properly.

Important points

Always use original DOLMAR belts to ensure the reliability and performance of your machine
Replace the belt only when it shows obvious signs of wear (cracks, fraying, visible wear)
Replacing the belt requires complex disassembly and adjustments not recommended for DIY

Contact a DOLMAR authorized dealer or service center to obtain the exact references for the belt and have the replacement done in accordance with the manufacturer's standards.

Question 3

What oil to use in the CS246.4C and what is the oil change interval?

Accepted Answer

For the DOLMAR CS246.4C, you must use an SAE 10W-30 oil of API SF class or higher (4-stroke engine oil for automobiles).

Key points:

Tank capacity: approximately 0.08 liters
First oil change: after 20 hours of use
Subsequent oil changes: every 50 hours of operation
Seasonal replacement: every 6 months, even without use (oil deteriorates over time)
Filling: keep the engine horizontal and never fill beyond the upper limit, to avoid contamination or white smoke
Daily check: check the oil level before each use

Important: Since this is a 4-stroke engine, never use a fuel mixture with engine oil.

Question 4

What fuel to use for the DOLMAR HT2360D hedge trimmer?

Accepted Answer

Unleaded gasoline 91 ROZ minimum is mandatory for the DOLMAR HT2360D. The high-efficiency 2-stroke engine is designed to operate with this fuel. You can use gasoline with a higher octane rating without risking engine damage.

Mandatory mixture with 2-stroke engine oil: The engine only operates when diluted in a fuel-oil mixture. Use a quality TSC-3 2-stroke oil according to the following ratio:

Ratio 50:1 with specified DOLMAR 2-stroke engine oil (1 liter gasoline + 20 ml oil) — MANDATORY ratio to ensure engine reliability
Ratio 25:1 with professional quality 2-stroke oil from other manufacturers (1 liter gasoline + 40 ml oil) — strongly recommended if DOLMAR oil is unavailable

Fuel preparation: In an approved container that meets local standards, first pour in all the oil with half of the required gasoline. Then add the remaining fuel. Shake the mixture vigorously before pouring it into the hedge trimmer's tank.

Critical warning: Never use pure gasoline. Never improvise the proportions. An excessive amount of oil produces more combustion residues, clogs the exhaust channel and the catalytic converter, increases gasoline consumption, and reduces performance. An insufficient amount severely compromises the lifespan of the 2-stroke engine.

Question 5

How to adjust the carburetor of a DOLMAR PS-7900 chainsaw?

Accepted Answer

The adjustment of the carburetor of your DOLMAR PS-7900 must follow a strict procedure to maintain engine performance and avoid damage.

Preparation

Before any adjustment, ensure that:

The engine is warm (after a few minutes of operation)
The air filter is clean
You have a tachometer (reference 950 233 210, required to measure the exact RPM)

The three adjustment screws

Your carburetor has three main screws:

Screw (S): Idle adjustment
Screw (L): Low-speed circuit adjustment (acceleration)
Screw (H): High-speed circuit adjustment (maximum RPM)

These screws are limited in rotation (about 180°) to comply with emission standards.

Adjustment procedure

Proceed in this order:

Step 1 - Idle: Turn the screw (S) to maintain a stable idle speed without chain movement
Step 2 - Acceleration: Gradually unscrew the screw (L) until achieving smooth and responsive acceleration
Step 3 - Maximum RPM: Adjust the screw (H) according to technical specifications without exceeding the allowed limits
Step 4 - Verification: Check the stability of the idle after adjustments

Important: Risks and recommendations

An incorrect adjustment risks engine overheating and insufficient lubrication, causing serious damage. The manual strongly recommends entrusting this adjustment to a specialized DOLMAR workshop to avoid mistakes and ensure compliance with standards.

Question 6

What should I do if my DOLMAR HT2360D hedge trimmer won't start?

Accepted Answer

If your DOLMAR HT2360D hedge trimmer won't start, first check that you are following the correct procedure. Place the device on a clean surface, then push the I-O switch to the "I" position. Next, press the primer bulb gently 7 to 10 times until fuel enters the system. Then, set the choke lever to the closed position (important for a cold engine), hold the hedge trimmer firmly, and pull the starter handle slowly 10 to 15 cm until you feel resistance. Finally, pull the handle firmly despite the resistance to start the engine.

A common cause of failure to start is flooding the engine. If you have pulled the starter handle several times with the choke closed, the carburetor is flooded with fuel and the engine will not start easily. In this case, remove the spark plug (NGK CMR6A for the HT2360D) and gently pull the starter handle several times to remove the excess fuel. Make sure to dry the spark plug electrode well before reinserting it.

Also check the condition of the air filter. A clogged filter can prevent the engine from receiving enough air to operate correctly. Clean or replace the filter if necessary. Additionally, ensure that the fuel is correct: the HT2360D requires unleaded gasoline with a minimum octane rating of 91 RON, mixed with oil in a 50:1 ratio using original DOLMAR oil. An improper mixture or contaminated gasoline will prevent starting.

Check the sealing of the spark plug. Remove it and check that it is not dirty, wet, or defective. If the electrode is black and covered with deposits, clean it with a fine wire brush. The gap between the electrodes should be 0.7 to 0.8 mm. If the spark plug is worn or damaged, replace it with a new NGK CMR6A.

If the engine remains without spark (no attempt to ignite), the problem lies with the ignition system. Check that the I-O switch is functioning correctly, that the spark plug connector is not loose, and that there is no damaged wiring. A defective ignition module will require professional intervention. If the engine starts but immediately stalls, the problem often comes from a contaminated WALBRO WYL type carburetor that needs cleaning or an incorrect idle adjustment.

After several unsuccessful attempts, let the engine rest for a few minutes to avoid overheating. For a hot start (immediate restart after stopping), use steps 1, 2, 4, 5, and 6 of the usual procedure but with the choke lever in the open position. If the problem persists despite these checks, consult an authorized DOLMAR professional for a complete diagnosis of the ignition or compression system.

Question 7

How to adjust the carburetion of the DOLMAR PS-5105 chainsaw?

Accepted Answer

Before you begin, ensure that the engine is clean and free of debris. Wear appropriate protective equipment (gloves, safety glasses). The carburetion adjustment should be performed on a flat and stable surface. Most importantly, check that the chain does not rotate at idle: this is a crucial safety requirement.

Your DOLMAR PS-5105 has three main adjustment screws: the S screw for idle, the L screw for low-speed acceleration, and the H screw for maximum speed. For optimal adjustment, start the engine and let it warm up for 3 to 5 minutes before beginning. Once the engine is warm, you can proceed with the adjustments.

Idle adjustment (S screw): Turn the S screw clockwise to increase the idle speed, or counterclockwise to decrease it. The engine should run smoothly and steadily. Important: the chain must absolutely not rotate at idle. If it does, reduce the idle with the S screw until it stops completely.

Maximum speed adjustment (H screw): Turn the H screw clockwise to increase the maximum speed. Adjust the H screw to the minimum according to the engine's technical specifications. Never exceed the maximum allowed speed. Once the maximum speed is reached, you will notice ignition interruptions: this indicates that the limit speed has been reached.

Acceleration adjustment (L screw): As soon as you operate the throttle, the engine should accelerate from idle to high speed without hesitation. Gradually unscrew the adjustment screw (L) by turning it counterclockwise until the engine accelerates well.

After each adjustment, repeat the adjustment operations until you achieve a stable idle without chain rotation, smooth acceleration, and the correct maximum allowed speed. If you encounter difficulties or if the carburetor is clogged, consult an authorized DOLMAR dealer.

Question 8

Where is the start button on the DOLMAR PS-6400 chainsaw?

Accepted Answer

On the DOLMAR PS-6400 chainsaw, there is no single start button but rather a starting system made up of several elements located on the side and top of the device. The I/STOP ignition switch (16) is located on the side of the machine and must first be toggled to activate the ignition. The choke lever (17) is located right next to it and is pulled manually until it audibly clicks into place. The start handle (14) that operates the starting cable is also located on the side of the chainsaw.

To start cold, follow this precise procedure:

Place the chainsaw on stable ground and ensure that the chain does not come into contact with any objects.
Push the I/STOP switch from the OFF position to ON to activate the ignition system.
Pull the choke lever until you hear a click confirming it is engaged. This simultaneously activates the semi-automatic throttle governor.
Press the decompression valve (13) if your model is equipped with one to facilitate starting.
Pull firmly on the start handle until you feel resistance, then continue to pull slowly and gradually. Do not pull the cable out more than 50 cm and always gently return it by hand to avoid damaging the mechanism.
As soon as the engine starts, push the choke lever down and hold the rear handle (which releases the governor and allows the engine to run at idle).

For a hot restart, use the same procedure but briefly pull the choke lever (back and forth once) before pulling the start handle, as the engine only needs minimal enrichment of the mixture.

Refer to the complete user manual for more details on carburetor adjustments and essential safety procedures before starting your DOLMAR PS-6400.

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