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Problem
Cause
Remedy
Intake filter fouled.
Clean the filter cartridge.
Intake filter fouled.
Clean the filter cartridge.
Oil seal on pump shaft worn.
Replace the worn oil seal.
Oil pressure inside pump too high. Restore correct oil level in tank.
Pump using too much oil(oil
flowing from delivery port) or
oil whitish in color (water/oil
emulsion in tank).
One or more disphragms ruptured.
Stop the pump at once.
Replace the diaphragm.
Pump Troubleshooting
Tighten, repair or replace
hose and fittings as necessary.
Inflate accumulator to the
correct pressure.
Inflate accumulator to the
correct pressure.
Remove the restriction from
the circuit.
See "Pump Intake Conditions"
section in Pump Manual.
Discharge the air by opening a
ball valve/central unit connected
to the delivery side with the
pump in operation.
Tighten, repair or replace
hoses and fittings,
as necessary.
Move control switching lever to
"By-pass" setting.
Replace the worn valves.
Replace the worn nozzles. Use
nozzles of suitable diameter.
Remove the restriction from
the circuit.
Clean or replace the intake
and delivery valves.
Valve plate stuck to it's seat.
Pressure accumulator
deflated.
Residual air left inside pump.
Pressure accumulator
deflated.
Restriction in intake circuit.
Pump drawing in liquid
from too low a level.
Intake circuit not airtight.
Control unit switching lever
on "Pressure" setting.
Seat and plate of intake and
delivery valves worn.
Nozzle worn or too large in
diameter.
Restriction in intake circuit.
Intake circuit not airtight.
Pump does not
prime properly.
Pump does not require the
required pressure.
Pressure gauge needle
wobbles, pressure pulsating.
Uneven flow of liquid to
nozzles.
Increase in noise and
simultaneous drop in oil
level (pump cavitation).
Oil on pump body or base.
