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Pump
Engine
Troubleshooting
If further assistance is required, contact your local authorized Maruyama service dealer.
Problem
Cause
Action
Pump doesn't rotate
No suction or suction time is
long
Low discharge volume
Low discharge pressure
Engine Will Not Start
Engine Will Not Idle
Engine Lacks Power or Stalls
When Cutting
Engine doesn't move
Impeller rusted
Debris is stuck in Impeller.
Air is being drawn in
Priming water is not sufficient
Mechanical seal failure
Engine rpm is too low
Pump position is too high from
water source
Suction hose is damaged or folded
Strainer or hose is clogged
Air is being drawn in
Engine rpm is too low
Pump position is too high from
water source
Impeller is worm
Suction hose diameter is too small
Debris is stuck in Impeller.
Strainer or hose is clogged
STOP switch set to off position
Empty fuel tank
Primer bulb wasn't pushed enough
Engine flooded
Idle speed set incorrectly
Throttle wire has come loose
Dirty air filter
Clogged spark arrester or exhaust port.
Refer to engine troubleshooting.
Disassemble and repair
Disassemble and clean
Check all connections and tighten
them.
Fill the pump casing with priming
water until it is full
Replace mechanical seal
Increase engine rpm
Place pump near water source
Replace suction hose
Check and clean
Check all connections and tighten
them.
Increase engine rpm
Place pump near water source
Replace Impeller
Use bigger diameter suction hose
Disassemble and clean
Check and clean
Move switch to on position
Fill fuel tank
Press primer bulb until fuel flows
through fuel return line
Use warm engine starting procedure
Set idle speed
Tighten throttle wire
Clean or replace air filter
Clean spark arrester or exhaust port