Lit. No. 27366, Rev. 01 February 15, 2008
81
PUMP PRESSURE TEST
NOTE: Reservoir will contain
residual pressure. Remove, then
reinstall, breather to release
pressure before proceeding.
1. Verify proper fluid level before
beginning test.
2. Attach a 3000 psi hydraulic
pressure gauge to pressure test
port as shown in the illustration.
3. Activate the right retract function
until blade is fully retracted.
NOTE: Control will time out after
3 seconds. Repeat command if
blade is not fully retracted.
4. Repeat the right retract function,
and read the pressure shown on
the gauge.
5. Refer to the following table.
MOVEMENT
BLADE
RIGHT
RETRACT
MOTOR M ON
Pump Pressure
Test Port
Pump Relief
Adjustment Valve
Adapter*
Hose
Pressure
Gauge
90° Elbow**
(if required)
NOTE: See the following page for Relief Valve Inspection and
Adjustment instructions.
CONDITION
POSSIBLE
CAUSE
CORRECTIVE ACTION
• Pump relief valve may be out of
adjustment. Turn relief valve
clockwise 1/4 turn and retest
pressure. Repeat until correct
pressure (2250 ± 50 psi) is obtained.
Pump Relief
Valve
• 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 wear or damage.
Reinstall/replace O-ring and pump,
then retest pump pressure.
Pump pressure
is below
2250 ± 50 psi.
Pump
• Remove the pump and inspect it for
wear or broken gears. Replace pump
if needed, adjust pump relief valve,
then retest pressure.
Motor draws
more than
265 Amps at
pump relief.
Motor • Replace the motor.
* Straight Adapter (-6 JIC 37° Male Flare to -4 SAE O-Ring Boss Port) not included in 56679 Pressure Test Kit. (Parker PN 6-4 F50X)
** 90° Elbow (-6 JIC 37° Female Swivel to -6 JIC 37° Male Flare) not included in 56679 Pressure Test Kit. (Parker PN 6 C6X)
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