Pump Pressure Test - Western HTS Mechanic's Manual

TROUBLESHOOTING GUIDE

PUMP PRESSURE TEST

WARNING
Keep 8' clear of the blade when
it is being raised, lowered, or
angled. Do not stand between
the vehicle and blade or
directly in front of the blade. If
the blade hits or drops on you,
you could be seriously injured.
NOTE: Reservoir will contain
residual pressure. Slowly remove,
then reinstall, breather to release
pressure before proceeding.
1. Verify proper fl uid level before
beginning test.
2. Relieve pressure in system using
test harness and operating all
snowplow functions.
Lit. No. 41467, Rev. 01
3. Attach a 3000 psi hydraulic
pressure gauge to the PS ram by
teeing into the line.
4. Activate the left angle function
until blade is fully angled.
NOTE: Control will time out after
9.6 seconds. Repeat command if
blade is not fully angled.
5. Repeat the left angle function,
and read the pressure shown on
the gauge.
6. Refer to the following table.
Pressure
Gauge
90° Elbow
Adapter
Hose
POSSIBLE
CONDITION
CAUSE
Pump Relief Valve
Pump pressure
is below
1650 ± 50 psi
O-Ring
(between pump
and valve block)
Pump
Motor draws more
Motor slow/plow
than 100A at
functions slow
pump relief
CORRECTIVE ACTION
Pump relief valve may be out of
adjustment. Turn relief valve clockwise
1/4 turn and retest pressure. Repeat
until correct pressure (1650 ± 50 psi) is
obtained.
If correct pressure is not obtained after
readjustment, remove and inspect the
relief valve and its components. Check
O-ring, stem and ball for wear or damage.
Reseat ball or replace relief valve as
needed. Reinstall/replace and readjust
valve, then retest pump pressure.
Remove the pump and inspect the
O-ring between the pump and the valve
block for damage. Reinstall/replace
O-ring and pump, then retest pump
pressure.
Remove the pump and inspect it for
wear or broken gears. Replace pump if
needed, adjust pump relief valve, then
retest pressure.
Replace the motor.
April 15, 2021
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