Lit. No. 41298, Rev. 01 February 15, 2019
65
PUMP PRESSURE TEST
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.
3. Attach a 3000 psi hydraulic pressure gauge to
the passenger-side 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.
TROUBLESHOOTING
CONDITION
POSSIBLE
CAUSE
CORRECTIVE ACTION
Pump pressure
is below
1650 ± 50 psi
Pump Relief Valve
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.
O-Ring
(between pump
and valve block)
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.
Pump
Remove the pump and inspect it for wear or broken gears. Replace pump
if needed, adjust pump relief valve, then retest pressure.
Motor slow/plow
functions slow
Motor draws more
than 100A at
pump relief.
Replace the motor.
Adapter
Hose
Pressure
Gauge
90° Elbow
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.
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