JLG 15/20MSP Service Manual - Manual (Page 37)

SECTION 3 - BASE COMPONENTS
3121231 – JLG Lift – 3-3
3.4 DRIVE AND CASTER WHEELS
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 opera-
tion.
Caster Wheels - Installation
Figure 3-2. Wheel Lug Nut Tightening Sequence
Table 3-1. 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)
Caster Wheel - Installation
1. Caster Wheel Assembly
2. Attach Screws and Wash-
ers (Qty. 4) (a)
3. Caster Shim (b)
NOTE: (a) On assembly, apply Loctite 242 to threads.
(b) As required; Place unit on a flat surface, shim a
caster wheel that is consistently more than .015" off of
flat surface.
3
2
1