MSD41 - Pump Maruyama - Free user manual and instructions

Product Type	High-pressure diaphragm pump
Brand	Maruyama
Model	MSD41
Engine Type	4-stroke, single-cylinder, air-cooled
Displacement	41 cc
Max Power	1.5 HP (1.1 kW)
Fuel Type	Unleaded gasoline
Fuel Tank Capacity	1.2 L
Max Flow Rate	30 L/min
Max Pressure	3.5 MPa (35 bar)
Suction Height	2 m
Delivery Height	30 m
Pump Material	Aluminum alloy with ceramic plunger
Weight (dry)	15 kg
Dimensions (L x W x H)	450 x 350 x 350 mm
Features	Automatic unloader valve, thermal overload protection
Maintenance	Clean filter after each use; change oil every 50 hours
Engine Oil	SAE 10W-30, 0.4 L
Safety	Stop engine before refueling or servicing; keep away from flammable materials
Spare Parts	Available through authorized Maruyama dealers
Intended Use	Agricultural spraying, pest control, irrigation

Frequently Asked Questions - MSD41 Maruyama

What type of oil should I use in the Maruyama MSD41 pump?

Use SAE 10W-30 engine oil for the crankcase. The capacity is approximately 0.4 L. Check the oil level before each use.

How do I prime the pump before starting?

Ensure the suction hose is submerged in water and fill the pump casing with water through the priming plug. Never run the pump dry.

What is the maximum pressure and flow rate of the MSD41?

The maximum pressure is 3.5 MPa (35 bar) and the maximum flow rate is 30 L/min. Adjust the pressure using the regulator valve.

How often should I clean the filter?

Clean the inlet filter after every use or whenever the flow rate drops. A clogged filter can cause poor performance and damage the pump.

Can I use the pump with chemicals or fertilizers?

Yes, the MSD41 is designed for agricultural chemicals. Rinse the system with clean water after use to prevent corrosion and residue buildup.

What maintenance is required after long-term storage?

Drain all fuel and oil, clean the pump, and store in a dry place. Before reuse, change the oil, clean the filter, and check for leaks.

How do I troubleshoot low pressure?

Check for air leaks in suction line, clogged filter, worn valves, or incorrect engine speed. Refer to the manual for detailed steps.

Is the pump self-priming?

No, the MSD41 is not self-priming. The pump casing must be filled with water before starting to create suction.

What spare parts are commonly replaced?

Common spare parts include diaphragms, valves, O-rings, and plunger seals. These are available from Maruyama dealers.

Where can I download the full user manual?

The full user manual for the Maruyama MSD41 is available for free download at notice-facile.com in PDF format.

USER MANUAL MSD41 Maruyama

OWNER'S/OPERATOR'S MANUAL

POWER SPRAYER MSD41

Main parts nomenclature

Specifications

Model		MSD41
Overall height	Overall length(mm)	195
	Overall width(mm)	255
	Overall height(mm)	210
Weight(kg)		5.6
Specifications	Revolving speed(rpm)	3600
	Suction capacity(1/min)	30
	Pressure(kgf/cm2)	40
	Required power(ps)	3.6
Inlet tap thread		G3/4
Outlet tap thread		G1/2
Lubricating oil		SC GRADESAE10W-30
Lubricating oil capacity(L)		0.38

Performance curve

*To be provided by the user.

Operating procedure

Be sure to check all the screws for tightness.

1. Lubricating oil.

Fill the lubricating oil into the crankcase up to the center level of the gauge.

2. Oiling

Feed a few drops of oil into the 3 holes of the crankcase.

3. Installing the suction hose and overflow hose.

Be sure to be equipped packing.

※Overflow hose and Suction hose are option.

1. Attaching the trainer for the hose coupling.

1. Insert the suction hose and overflow hose into the chemical tank.

1. Coincide knob of pressure regulator with START.

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1. Close the valve.

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1. Starting

Starting the engine.

1. Pressure regulation.

1. Spraying

graph TD
    A["Stopping operation and maintenance"]

1. Stopping spraying

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1. Wash up with the clean water after spraying.

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1. Running the Power Sprayer.

Running the Power Sprayer.

1. Continue to run the sprayer for one minute after raising the strainer.

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1. Caution !!

1. Stopping

Stopping the engine.

1. Detach the suction hose and overflow hose.

Suction hose

Overflow hose

※Overflow hose and Suction hose are option.

1. Resume knob to START position.

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Protection from freezing.

Water should be completely drained during winter storage to prevent freezing.

The operation is per formed according to items from 11 to 18 in the operation procedure.

Inspection and adjustment

Discharge valve and its vicinity.

Inspect discharge valve and valve seat for wearing degree over their contact surface. Replace worn or spoiled ones, if any.

Piston and its vicinity.

Inspect parts as exploded for damage wear break, etc. Lubricate mobile oil over piston packing when assembled.

Replacement of Crankcase oil.

Replace at 50 hours operation after initial operation.

Precautions

When hoses are vibrating themselves...

Thank you very much for your purchase this time. Needless to say, no matter how excellent the quality of the product may be it won't display its maximum potential performance unless operated properly.

Read this Owner's/Operator's Manual repeatedly prior to operation in order to make the best use of the product.

Power sprayers are for agricultural or irrigation uses and not for industrial use. Therefore, do not use chemicals, seawater, hot water, etc.

When agrichemicals are used, read and follow the Owner's/Operator's Manual for chemicals. You had better go and ask our dealer nearby or shop you purchased from for further information and questions you have on the product.

When pump fails to suck liquid.

graph TD
    A["① Open main cock."] --> B["② Once pump sucks liquid."]
    B --> C["③ Close main cock."]

Hose vibration occurs when air is released out of air-chamber.

It will stop if you let air send forth as following procedural.

①
②Release pressure

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Lift suction strainer once to let it suck air for about 10 seconds and plunge it into water again.

④

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⑤

When pressure fails to get accumulated…

● Inspect pressure regulating valve for wear.

●Replace wrong nozzle for proper one.

When nozzle orifice is big.... Make orifice small

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When spray is voluminous .... Make spray less voluminous.

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Choose right nozzle so that its spray volum fails on about 80% (but not more than 80%) of suction volume.

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1. Cerrar la válvula.

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1. Arranque

Arrancar el motor.

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1. ¡Cuidado!

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②Librar la presión.

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⑤

Alta presión

Presión baja

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