September 2016
Service Manual
Hydraulic Power Unit
Part No. 38139
AWP Super Series • IWP Super Series
87
3-
6 H ydr aulic Pump
3-6
Hydraulic Pump
How to Remove the Hydraulic
Pump
Note: When removing a hose assembly or fitting,
the O
-
ring (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications,
Hydraulic Hose and Fitting Torque
Specifications.
1
Fully lower the platform.
2 Turn
the key switch off and disconnect the
power supply.
3
IWPS models
: Pull the base lowering handle
to fully lower the base.
4
Remove the power unit cover.
5
Remove the power unit. See 3
-
4,
How to
Remove the Power Unit.
6
Support the hydraulic tank with a lifting device.
7
Remove the mounting fasteners from the tank.
Remove the tank from the power unit. Do not
allow the hydraulic oil to spill.
Note: It may be necessary to tap the side of the
tank with a soft rubber mallet to loosen it.
8
Remove the mounting fastener from the
suction cover assembly on the pump. Then
remove the suction cover.
9
Remove the mounting fasteners from the
pump. Then remove the pump from the power
unit.
Note: When installing the tank, be sure not to
damage the o
-ring.
3-
7 Valve Adjustment
3-7
Valve Adjustment
How to Adjust the Platform Lift
Relief Valve
Note: Be sure the hydraulic oil level is between the
FULL
and
ADD
marks on the oil level indicator.
1
Remove the power unit cover.
2
Loosen the locknut on the relief valve located
on the right side of the motor.
3
Follow the appropriate operator's manual to
set up the machine for operation.
4
Place maximum rated load into the platform.
Secure the load to the platform. Refer to
Specifications,
Machine Specifications.
5
Hold the relief valve screw and loosen the lock
nut.
6
While activating the platform up function, turn
the relief valve screw clockwise, just until the
platform begins to raise.
7
Fully lower the platform.
8
Add additional weight to the platform that is
equal to, but does not exceed 20% of the
maximum rated load. Secure the additional
weight. Refer to the machine serial plate.
