Oshkosh Corporation JLG 450AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121659 – JLG Lift – 3-1
SECTION 3. CHASSIS & TURNTABLE
3.1 TIRES AND WHEELS
Tire Damage
For pneumatic tires, JLG Industries, Inc. recommends that
when any cut, rip, or tear is discovered that exposes sidewall or
tread area cords in the tire, measures must be taken to remove
the JLG product from service immediately. Arrangements
must be made for replacement of the tire or tire assembly.
For polyurethane foam filled tires, JLG Industries, Inc. recom-
mends that when any of the following are discovered, mea-
sures must be taken to remove the JLG product from service
immediately and arrangements must be made for replace-
ment of the tire or tire assembly.
• a smooth, even cut through the cord plies which exceeds 3
inches (7.5 cm) in total length
• any tears or rips (ragged edges) in the cord plies which
exceeds 1 inch (2.5 cm) in any direction
• any punctures which exceed 1 inch in diameter
• any damage to the bead area cords of the tire
If a tire is damaged but is within the above noted criteria, the
tire must be inspected on a daily basis to insure the damage
hasn’t propagated beyond the allowable criteria.
Wheel and Tire Replacement
The rims installed on each product model have been designed
for stability requirements which consist of track width, tire
pressure, and load capacity. Size changes such as rim width,
center piece location, larger or smaller diameter, etc., without
written factory recommendations, may result in an unsafe
condition regarding stability.
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 fasten-
ers. 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-tighten-
ing 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. Fol-
lowing 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 and
torque every 3 months or 150 hours of operation.
Table 3-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
40 ft lbs (55 Nm) 95 ft lbs (130 Nm) 170 ft lbs (230 Nm)