JLG G12-55A Service Manual - Manual (Page 84)

Axles, Drive Shafts, Wheels and Tires
5-4 G10-55A, G12-55A
15. Remove axles from machine using jack, hoist or
overhead crane and sling supporting the axle. DO
NOT raise or otherwise disturb machine while
removing axle. Balance axle and prevent it from
tipping, turning or falling while removing it from
beneath machine. Place axle on a suitable support
or holding stand.
5.4.2 Axle Installation
1. Before proceeding, ensure that machine will remain
in place during axle installation. Block front and rear
of both tires on the axle that is already installed on
the machine.
2. If applicable, raise machine using a suitable jack or
hoist. Place suitable supports beneath frame and
lower machine onto supports, allowing enough room
for axle installation. Ensure that machine will remain
in place during axle installation.
3. Using a suitable jack, hoist or overhead crane and
sling, remove axle from its support or holding stand.
Balance axle and prevent it from tipping, turning or
falling while positioning it beneath machine. DO NOT
raise or otherwise disturb machine while installing
axle. Keep axle supported and balanced on jack,
hoist or overhead crane and sling throughout the
installation procedure.
4. Position axle under frame, and align axle housings
with holes in frame.
5. Install four axle bolts and nuts. Tighten and torque to
530-565 lb-ft (718-766 Nm).
6. Move cylinder into position on axle cylinder anchor.
Insert a cylinder-mount pin through cylinder and
cylinder anchor. Secure the cylinder-mount pin with
one capscrew and a new locknut.
7. Apply multi-purpose grease through the self-tapping
lube fitting to lubricate the self-align bearing and the
cylinder-mount pin.
8. Install the drive shaft assemblies. (Refer to Section
5.5.5, “Drive Shaft Installation.”)
9. If reinstalling an axle previously removed from the
machine, position driveshaft yoke on axle according
to alignment marks made earlier. If installing a new
axle, note position of driveshaft yoke at transmission.
Align driveshaft yoke on axle in same plane as yoke
on transmission.
10. Tighten axle oil drain plug, loosen and remove axle
oil fill plug (1). (Refer to Section 2.5, “Fluids and
Lubricant Capacities,” for proper oil and capacities.
11. Rotate wheel hubs 90 degrees so drain plug (2)
becomes fill plug (3). Refer to Section Note:,
“Friction Modifier required for axle differentials, see
Section 2.5.3, “Capacities.”,” for proper oil and
capacities.
12. Install the wheel and tire assemblies. Refer to
Section 5.6.2, “Wheel and Tire Assembly
Installation.”
13. Carefully remove jack, hoist or overhead crane and
sling supporting the axle.
14. Carefully raise machine using a suitable jack or
hoist. Remove supports from beneath frame and
lower the machine to ground.
15. Remove blocks from front and rear of both tires on
other axle.
Note: ALWAYS use new o-rings when servicing
the machine.
16. Install new o-rings into the fittings. Lubricate the
o-rings with clean hydraulic oil.
17. Uncap and connect the steering and brake lines at
their axle fittings.
18. Check the hydraulic reservoir oil level.
19. Start engine. Turn steering wheel several times lock
to lock, operate the frame tilt function several times
in both directions and check the function of the
brakes. Check for hydraulic leaks, and tighten or
repair as necessary.
20. Install the optional fender assembly.
21. Close and secure the engine cover.
22. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
Note: The service brake and parking brake circuits will
need to bled after axle installation. Refer to Section
8.7.4, “Service Brake Bleeding.”
MY4180
2 1 1 2
MY6940
3
LEVEL