JLG 800S Service Manual - Manual (Page 80)

SECTION 3 - CHASSIS & TURNTABLE
3-34 – JLG Lift – 3121139
3.6 WHEEL DRIVE ASSEMBLY, 4WD
Removal and Disassembly
NOTE: The drive motor can be removed through the axle
flange as part of the wheel drive assembly or they
can be removed separately through the bottom of
the frame while leaving the torque hub bolted to the
axle.
1. Use a jack to lift the frame enough so the tire and
wheel assembly is off of the ground. Place blocking
strong enough to support the weight of the machine
under the frame and remove the jack.
NOTE: The pneumatic tire & wheel assembly weighs
approximately 269 lbs. (122 kg). The foam-filled tire
& wheel assembly weighs approximately 544 lbs.
(247.25 kg).
2. Remove the tire and wheel assembly.
3. Through the access holes in the axle, tag and dis-
connect the hydraulic lines running to the drive
motor. Cap or plug all openings to ensure no dirt
enters the hydraulic system.
NOTE: The torque hub and drive motor assembly weighs
approximately 270 lbs. (122 kg).
4. Use a supporting device capable of handling the
weight of the torque hub and drive motor and unbolt
the torque hub from the frame. Remove the entire
assembly from the machine.
5. Remove the bolts and washers that secure the drive
motor to the torque hub and remove the drive motor.
Remove and discard the o-ring between the drive
motor and torque hub.
Assembly and Installation
1. Install a new o-ring between the drive motor and
torque hub. Install the bolts and washers to secure
them together and torque to 110 ft. lbs. (149 Nm).
2. Place the torque hub flange against the mounting
flange on the axle and fasten it in place with the bolts
and washers. Torque the bolts to 220 ft. lbs. (298
Nm).
3. Install the tire and wheel assembly.
Figure 3-27. Torque Hub Installation - 4WD