MSD51 - Pump Maruyama - Free user manual and instructions

Product Type	Power Sprayer (Pump)
Brand	Maruyama
Model	MSD51
Overall Length	235 mm
Overall Width	337 mm
Overall Height	176 mm
Weight	7.8 kg
Revolving Speed	3600 rpm
Suction Capacity	40 L/min
Maximum Pressure	40 kgf/cm²
Required Power	5.0 PS
Inlet Tap Thread	G1
Outlet Tap Thread	G1/2
Lubricating Oil	SC GRADE SAE10W-30
Lubricating Oil Capacity	0.4 L
Intended Use	Agricultural and irrigation (not industrial)
Precautions	Avoid chemicals, seawater, hot water; follow chemical manual
Maintenance	Replace crankcase oil after 50 hours of operation
Inspection	Check discharge valve and piston packing for wear

Frequently Asked Questions - MSD51 Maruyama

What type of oil should I use for the Maruyama MSD51 pump?

Use SC GRADE SAE10W-30 lubricating oil. The crankcase capacity is 0.4 L.

How do I prime the pump if it fails to suck liquid?

Open the main cock, let the pump suck liquid, then close the main cock. If the problem persists, lift the suction strainer to let it suck air for about 10 seconds, then plunge it back into water.

How do I adjust the pressure on the MSD51?

Use the pressure regulator knob. Turn it to increase or decrease pressure. The maximum pressure is 40 kgf/cm².

Why does the hose vibrate during operation?

Hose vibration is caused by air trapped in the air-chamber. To stop it, release the pressure, then lift the suction strainer to let it suck air for about 10 seconds, and plunge it back into water. Also ensure the pressure regulator is set correctly.

How should I store the pump in winter to prevent freezing?

Drain all water completely from the pump and hoses during winter storage. Follow the operation procedure steps 11-18 to ensure no water remains inside.

What is the maximum pressure and required power for the MSD51?

The maximum pressure is 40 kgf/cm² at a revolving speed of 3600 rpm. The required power is 5.0 PS at that pressure.

Can I use the Maruyama MSD51 for industrial applications?

No, this pump is designed only for agricultural and irrigation use. Do not use it with chemicals, seawater, hot water, or for industrial purposes.

How often should I change the crankcase oil?

Replace the crankcase oil after the first 50 hours of operation, and then regularly according to the maintenance schedule.

How do I inspect the discharge valve?

Check the discharge valve and valve seat for wear or damage on the contact surface. Replace worn or spoiled parts as needed. Also inspect the piston and its vicinity for damage.

What should I do if the nozzle orifice is too big or spray is voluminous?

Choose a smaller nozzle orifice to reduce spray volume. The spray volume should be about 80% of the suction volume (but not more than 80%).

USER MANUAL MSD51 Maruyama

OWNER'S/OPERATOR'S MANUAL

POWER SPRAYER MSD51

Main parts nomenclature

Specifications

Model		MSD51
Overall height	Overall length(mm)	235
	Overall width(mm)	337
	Overall height(mm)	176
Weight(kg)		7.8
Specifications	Revolving speed(rpm)	3600
	Suction capacity(1/min)	40
	Pressure(kgf/cm2)	40
	Required power(PS)	5.0
Inlet tap thread		G1
Outlet tap thread		G1/2
Lubricating oil		SC GRADESAE10W-30
Lubricating oil capacity(L)		0.4

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.

1. Installing the suction hose and overflow hose.

Be sure to be equipped packing.

1. Attaching the strainer for the hose coupling.

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

1. Coincide knob of pressure regulator with START.

Technical line drawing of a mechanical component with no visible text or symbols

1. Close the valve.

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1. Starting

1. Pressure regulation.

1. Spraying

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.

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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Diagram of a heat exchanger or cooling unit with no visible text or symbols

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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 smaller

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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.

Illustration of a bucket being inserted into a container with a tool, showing fluid flow (no text or symbols)

Illustration of a medical procedure showing a tool interacting with a patient's mouth and cup (no text or symbols present)

1. ¡Cuidado!

Technical line drawing of a heat exchanger or cooling unit with a black arrow pointing to the outlet (no text or symbols present)

Pure mechanical component diagram without any text, numbers, or symbols

②Librar la presión.

Illustration of a mechanical device being inserted into a container with a tool (no text or symbols visible)

Mechanical component diagram showing a valve assembly with a curved arrow indicating direction (no text or symbols)

⑤

Alta presión

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Technical line drawings of two electrical connectors (no text or symbols)