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The information provided is intended to provide guidance how to deal with malfunctions which may occur
during use.
Some of these procedures may be carried out by skilled staff, while others have to be performed at specialised
service centres since they require the use of specific equipment as well as detailed knowledge of repair opera-
tions.
Problem
The pump does not
prime properly.
The pump does not require the
required pressure.
Pressure gauge needle wobbles,
pressure throbbing.
Uneven flow of liquid to nozzles.
Increase in noise and simultaneous
drop in oil level (pump cavitation).
(1) Operations which must be carried out at an authorised service centre
English language
TROUBLESHOOTING
Cause
Intake circuit not airtight.
Distributor switching lever on
"Pressure" setting.
Seat and plate of intake and deliv-
ery valves worn.
Nozzles worn or too large in
diameter.
Restriction in intake circuit.
Intake filter fouled.
Intake circuit not
airtight.
Residual air left inside
pump.
Valve plate stuck
to its seat.
Pressure accumulator deflated
Pressure accumulator deflated
Restriction in intake circuit.
Intake filter fouled.
Pump drawing in liquid from too
low a level.
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Remedy
Tighten, repair or replace hoses
and fittings as necessary.
Move distributor switching lever to
"By-pass" setting.
Replace the worn valves.(1)
Replace the worn nozzles.
Use nozzles of suitable diameter.
Remove the restriction from the
circuit.
Clean the filter cartridge.
Clean or replace the intake and
delivery valves. (1)
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.
Inflate accumulator to the correct
pressure.
Inflate accumulator to the correct
pressure.
Remove the restriction from the
circuit.
Clean the filter cartridge.
See "Pump Intake Conditions"
section.
Use and Installation
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