SECTION 8
HYDRAULIC SYSTEM SERVICING
8-1. LINES AND FITTINGS
WARNING: When the platform is raised, pressure
exists in the hydraulic system lines and
fitt
ings. To ensure release of pressure,
platform must be fully lowered and the
batteries disconnected before
performing any maintenance on the
hydraulic system.
NOTE: Leaking hydraulic fittings may be remedied by
simply tightening fittings. If this does not
rem
edy the leak, the fittings or line must
be replaced.
1. Fully lower the platform.
2. Engage the emergency power disconnect switch
and turn off key switch.
3. Remove the compartment cover as described in
paragraph 4-2.1.
WARNING: Relieve pressure off the system prior to
opening any lines.
CAUTION: Hydraulic oil can damage parts. Wipe off
any oil immediately. Provide a container
under the line or fitting before
disconnecting.
4. Refer to Figure 8-1 and remove leaking line or fit-
ting and replace it with a new line or fitting.
5. Check level of hydraulic oil. If required, add
hydraulic oil to bring to proper level. Use hydraulic
oil listed in Table 2-2.
6. Disengage the emergency power disconnect
switch and turn on key switch.
7. Operate the lift and lower buttons to refill the
cylinder and lines with hydraulic oil.
8. Check level of hydraulic oil. If required, add
hydraulic oil to bring to proper level. Use hydraulic
oil listed in Table 2-2.
9. Install the compartment cover as described in
paragraph 4-3.2.
8-2. HYDRAULIC PUMP, MOTOR, AND RESER-
VOIR ASSY
The hydraulic pump/motor assembly can be
disas
sembled and repaired. However, a defective
pump, valve or motor requires replacement of that
component.
WARNING: When the platform is raised, pressure
exists in the hydraulic system lines and
fit
tings. To ensure release of pressure,
platform must be fully lowered and the
batteries disconnected before
performing any maintenance on the
hydraulic system.
8-2.1. Removal
1. Fully lower the platform.
2. Engage the emergency power disconnect switch
and turn off key switch.
3. Remove the compartment cover as described in
paragraph 4-2.1.
4. Tag and disconnect electrical leads from motor
and solenoid of pump/motor assembly.
NOTE: The reservoir and tube will be filled with
hydraulic oil. Place a container under the
pump assembly to catch any hydraulic oil.
5. Disconnect hose from pump/motor assembly.
6. While supporting pump/motor assembly, remove
two
screws and two lock washers.
7. Remove the pump/motor assembly.
8. Remove the bracket from the pump/motor
assembly.
9. Install pump/motor assembly in reverse order of
removal.
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