JLG 4394RT Service Manual - Manual (Page 140)

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3-104 – JLG Lift – 3121249
Pumps
ALLOW ENGINE AND COMPONENTS TO COOL DOWN BEFORE
SERVICING.
REMOVAL:
1. Disable machine operation. Disconnect, cap and
label all hydraulic hoses connected to pumps (1, 4).
Disconnect and label all wiring connected to pumps.
2. Remove the two bolts (2) and washers (3) attaching
the gear pump (1) to the axial pump (4). Carefully
remove the gear pump.
3. Remove and discard the o-ring (4).
4. Remove the two bolts (5) and washers (6) attaching
the axial pump to the flange (7) of the coupling.
Carefully remove the axial pump.
INSTALLATION:
1. Follow Removal Steps in reverse.
NOTE: Apply Loctite® #242 to bolts (2, 5).
Apply grease to internal splines of pump coupling
and external splines of axial pump (4) shaft prior to
installing pump.
Install a new o-ring (4) during installation.
NOTE: Refer to Section 4.9, Gear Pump and Section 4.10,
Axial HI 45 Pump for more information on pumps.
7
6
2
3
1
5 8 4
1. Gear Pump
2. Bolt, 3/8"-16NC x 1"
3. Washer
4. O-ring
5. Axial HI 45 Pump
6. Bolt, 1/2"-13NC x 1 1/2"
7. Washer
8. Coupling Flange
Figure 3-76. Pump Assemblies (GM Engine)