JLG 20VP (3120728) Service Manual - Manual (Page 28)

SECTION 2 - SERVICE PROCEDURES
2-10 – JLG Lift – 3120728
IF REMOVING THE COMPLETE DRIVE ASSEMBLY, IT WEIGHS
APPROXIMATELY XX LB. AND WILL REQUIRE ASSISTANCE TO
LOWER. PREFERABLY USE A MOVABLE TRANSMISSSION OR
OTHER HYDRAULIC JACK TO CAREFULLY LOWER ASSEMBLY
FROM UNDER MACHINE.
11. Carefully remove the four (4) nuts and washers
(outer most holes on the drive assembly weldment)
from the carriage bolts attaching the drive motor
assembly to the base frame. Be aware of the weight
of the assembly before completely removing the fas-
teners, see the CAUTION above.
12. Lower the drive assembly and place on a suitable
work surface.
Gear Box Disassembly/Assembly
(See Figure 2-8.)
The drive motor gear box is mounted on the rear of each
drive motor transferring power from the electric drive
motor to the rear drive wheels. It is a right angle worm
gear type box with a 50:1 reduction drive ratio. The inter-
nal gears and bearings of the gear box are lubricated by
175cc’s of gear oil in an unvented aluminum alloy hous-
ing. Early VP machines included a oil drain plug on the
rear surface of the gear box housing, later model
machines do not. The following procedures disassemble
and assemble the gear box housing internal components.
Gear Box Disassembly (See Figure 2-8.)
1. Remove the drive motor/gear box/brake assembly
from the machine using the procedure outlined pre-
viously in this section of the manual.
Figure 2-8. Drive Motor Gear Box Assembly.