5.
CLOSING THE WATER
PRESSURE LINE DOES
NOT DROP PRESSURE
TO FREE
CIRCULATION MODE.
Hydraulic system
starts to run through
the pressure relief
valve, emitting
excessive heat.
Models with water
pressure unloader
valve
.
5.1
Insufficient hydraulic
pressure in relation to
pumping fluid pressure,
adjusted with water pressure
unloader valve.
5.2
Defective water pressure
unloader valve.
5.1
Adjust the hydraulic pressure up as much as
necessary to enable proper operation of
water pressure unloader valve.
Note that the maximum hydraulic pressure
should not be overrun !
If boosting the hydraulic pressure is not
possible, the water unloader pressure setting
should be dropped.
5.2
Repair or replace water pressure unloader
valve.
6.
LEAKAGES
6.1
Hydraulic oil leakages.
6.2
Pumping fluid leakages.
6.3
Hydraulic-pumping fluid
commixture dropping from
leakage detecting bores.
6.1
Check the tightness of component mating,
tighten screws.
Replace when necessary sealings of pump’s
mated surfaces.
Check and tighten/replace couplings.
6.2
Check the tightness of component mating,
tighten screws.
Replace when necessary sealings of pump’s
mated surfaces.
Check and tighten/replace couplings.
6.3
If the draining from leakage detectors exceeds
rate of 10 drops per minute, pump’s sealings
should be replaced.
The rule applies to dropping of hydraulic fluid,
pumping fluid and their commixture.
HPW TROUBLESHOOTING
MAY CHANGE WITHOUT PRIOR NOTICE
High pressure pump HPW 200/30-45-ST
22/26
May 2012