JLG 800S Service Manual - Manual (Page 48)

SECTION 3 - CHASSIS & TURNTABLE
3-2 – JLG Lift – 3121139
Wheel Installation
It is extremely important to apply and maintain proper
wheel mounting torque.
WHEEL NUTS MUST BE INSTALLED AND MAINTAINED AT THE
PROPER TORQUE TO PREVENT LOOSE WHEELS, BROKEN STUDS,
AND POSSIBLE DANGEROUS SEPARATION OF WHEEL FROM THE
AXLE. BE SURE TO USE ONLY THE NUTS MATCHED TO THE CONE
ANGLE OF THE WHEEL.
Tighten the lug nuts to the proper torque to prevent
wheels from coming loose. Use a torque wrench to tighten
the fasteners. If you do not have a torque wrench, tighten
the fasteners with a lug wrench, then immediately have a
service garage or dealer tighten the lug nuts to the proper
torque. Over-tightening will result in breaking the studs or
permanently deforming the mounting stud holes in the
wheels. The proper procedure for attaching wheels is as
follows:
1. Start all nuts by hand to prevent cross threading. DO
NOT use a lubricant on threads or nuts.
2. Tighten nuts in the following sequence:
3. The tightening of the nuts should be done in stages.
Following the recommended sequence, tighten nuts
per wheel torque chart.
4. Wheel nuts should be torqued after first 50 hours of
operation and after each wheel removal. Check
torque every 3 months or 150 hours of operation.
3.2 WHEEL DRIVE ASSEMBLY, 2WD
Removal and Disassembly
NOTE: The drive motor and/or drive brake 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 and drive brake. Cap or plug all openings to
ensure no dirt enters the hydraulic system.
NOTE: The torque hub, drive brake, and drive motor assem-
bly weighs approximately 275 lbs. (125 kg).
4. Use a supporting device capable of handling the
weight of the torque hub, drive brake, and drive
motor and unbolt the torque hub from the frame.
Remove the entire assembly from the machine.
5. Remove the nuts and washers that secure the drive
motor to the torque hub and drive brake and remove
the drive motor. Remove and discard the o-ring
between the drive motor and drive brake.
6. Remove the drive brake from the torque hub.
Remove and discard the o-ring between the drive
brake and torque hub.
7. If necessary, remove the studs from the torque hub.
Table 3-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
70 ft. lbs.
(95 Nm)
170 ft. lbs.
(225 Nm)
300 ft. lbs.
(405 Nm)