JLG 9MP Service Manual - Manual (Page 36)

SECTION 4 - CONTROL COMPONENTS
4-6 – JLG Lift – 3121163
4.6 PUMP-MOTOR ASSEMBLY -
SERVICE PROCEDURE
General
The following is a complete tear-down/re-assembly of the
machines’ pump/motor assembly. No internal parts to the
hydraulic pump are serviced by JLG except for a pump
installation seal kit. Also the only parts serviceable internal
to the pump electric motor is the motor brush kit.
NOTE: During reassembly of the pump/motor assembly,
apply a liberal coat of JLG recommended hydraulic
fluid to all seals and o-rings.
Also keep all internal metal parts clean and coated
with hydraulic fluid to prevent surface corrosion.
JLG recommends replacing all seals and o-rings
when disassembling and reassembling the pump/
motor unit.
Pump/Motor/Reservoir - Remove/Install
BE CERTAIN THE MAST IS FULLY LOWERED BEFORE REMOVING
ANY HYDRAULIC LINES FROM THE PUMP UNIT. WEAR PROTEC-
TIVE GEAR WHEN WORKING AROUND PRESSURIZED HYDRAULIC
LINES. REMOVE CONNECTIONS CAREFULLY AND CAP ALL
LINES AND PORTS WHEN DISCONNECTED.
• Remove the ground control station cover, see Section 4.2.
• Remove the extend/return hydraulic lines.
• Remove all electrical connections from pump assembly.
1. Pump Assembly 3. Pump Mount
2. Mounting Screws (a)
Notes: (a) Apply Loctite #242 to mounting screw threads before
tightening.
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