JLG 1230ES, Service And Maintenance Manual

Page: 41 / 204

SECTION 4 - BASE COMPONENTS
3121222 – JLG Lift – 4-3
4.3 WHEELS AND TIRES - DRIVE AND REAR
Tire Wear and Damage
Inspect tires periodically for wear or damage. Tires with
worn edges or distorted profiles require replacement.
Tires with significant damage in the tread area or side wall,
require immediate evaluation before replacing the
machine into service.
Wheel and Tire Replacement
Replacement wheels must have the same diameter and
profile as the original. Replacement tires must be the same
size and rating as the tire being replaced.
Wheel Installation
It is extremely important to apply and maintain proper
wheel mounting torque.
WHEEL LUG NUTS MUST BE INSTALLED AND MAINTAINED AT THE
PROPER TORQUE TO PREVENT LOOSE WHEELS, BROKEN LUG NUTS,
AND POSSIBLE SEPARATION OF WHEEL FROM THE AXLE. BE SURE TO
USE ONLY THE LUG 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 lug nuts
or permanently deforming the mounting holes in the
wheels. The proper procedure for attaching wheels is as
follows:
1. Start all lug nuts by hand to prevent cross
threading. DO NOT use a lubricant on threads or
nuts.
2. Tighten lug nuts in the following sequence.
3. The tightening of the lug nuts should be done in
stages. Following the recommended sequence,
tighten lug nuts per wheel torque.
4. Wheel lug nuts should be torqued after the first
50 hours of operation and after each wheel
removal. Check torque every 3 months or 150
hours of operation.
Figure 4-2. Wheel Lug Nut Tightening Sequence
Table 4-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
20-30 ft lbs
(28 - 42 Nm)
65-80 ft lbs
(91 - 112 Nm)
105 -120 ft lbs
(142 - 163 Nm)