Lit. No. 30118, Rev. 00
June 15, 2020
78
Pressure Test Port
Pressure
Gauge
Female
Connector
Hose
90° Elbow
Short Connector
TROUBLESHOOTING
PUMP PRESSURE TEST
NOTE: Reservoir will contain residual pressure.
Slowly remove, then reinstall, the breather to
release pressure before proceeding.
1. Lower the blade to the ground. Verify proper
fl
uid level before running the test.
2. Attach a 3000 psi hydraulic pressure gauge to
the pressure test port in the location shown.
3. Activate the RIGHT WING EXTEND function
until the wing is fully extended.
NOTE: Control will time out after 3.0 seconds.
Repeat the command if blade is not yet fully
extended.
4. Repeat the RIGHT WING EXTEND function
and read the pressure shown on the gauge.
5. Refer to the table to determine the necessary
corrective action. Do not adjust the pressure
setting more than 1/4 turn at a time.
Do not
adjust the relief valve while the motor is
running.
TROUBLESHOOTING
CONDITION
POSSIBLE CAUSE
CORRECTIVE ACTION
Pump pressure
is below
2000 ± 100 psi.
Pump Relief Valve
The pump relief valve may be out of adjustment. Turn the relief
valve clockwise 1/4 turn and retest the pressure. Repeat until
correct pressure (2250 ± 100 psi) is obtained.
If correct pressure is not obtained after readjustment, remove
and inspect the relief valve and its components. Check the
O-ring, stem, and ball for wear or damage. Reseat the ball
or replace the relief valve as needed. Reinstall/replace and
readjust the 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 wear or damage. Reinstall/replace the
O-ring and pump, then retest pump pressure.
Pump
Remove the pump and inspect it for wear or broken gears.
Replace the pump if needed, adjust the pump relief valve, then
retest pressure.
Motor draws
more than 190A
at pump relief.
Motor
Replace the motor.
WARNING
The tester shall keep bystanders 8' clear of
the blade during these tests. Do not stand
between vehicle and blade or within
8 feet of a moving blade. A moving or
falling blade could cause personal injury.
NOTE: See the following page
for Relief Valve Inspection and
Adjustment instructions.
