Variable Pump; Removal; Assembly/Disassembly; Installation - JLG 600SC Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS

5.4 VARIABLE PUMP

Removal

ENSURE THE PRESSURE IS PROPERLY RELIEVED FROM THE HYDRAULIC SYS-
TEM BEFORE PROCEEDING TO REMOVAL OF THE PUMP MOTOR.
1. Disconnect the hydraulic hoses from inlet and outlet
ports of the front and rear variable pumps.
CAP ALL THE HYDRAULIC HOSES TO PREVENT ENTRAPPING OF THE DUST AND
DIRT INTO IT.
2. Remove two bolts secured on the rear variable pump.
3. Carefully dislodge the rear variable pump shaft from the
front variable pump assembly.
4. Carefully place the rear variable pump on the clean
working surface.
5. Remove two bolts secured on the front variable pump.
6. Carefully dislodge the front variable pump shaft from
the front engine assembly.
7. Carefully place the front variable pump on the clean
working surface.
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Assembly/Disassembly

For detail assembly/disassembly instructions, contact local JLG
or JLG dealer for information.

Installation

DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON A CLEAN WORK
SURFACE IN A DIRT FREE WORK AREA.
VARIABLE
Figure 5-67. Variable Pump Installation
1. Check for gear teeth on shaft for scoring, pitting taper-
ing and damage. If damaged need to be replaced with a
new assembly completely.
2. Apply thin film of spline grease on the gear shaft.
3. Carefully insert the shaft of front variable pump into the
engine and secure it using two bolts. Apply JLG Thread-
locker P/N 0100011 to end of bolts. Torque bolts to
46-56 ft.lbs (62-76 Nm).
4. Carefully insert the shaft of rear variable pump into the
front piston pump and secure it using two bolts. Apply
JLG Threadlocker P/N 0100011 to end of bolts. Torque
bolts to 46-56 ft.lbs (62-76 Nm).
5. Remove cap from the hydraulic hoses and re-connect to
their original locations.
FRONT
PUMP
BOLT
REAR
VARIABLE
PUMP
MAE24960
3121776