JLG 340AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121259 – JLG Lift – 3-1
SECTION 3. CHASSIS & TURNTABLE
3.1 TIRES AND WHEELS
Tire Replacement
JLG recommends a replacement tire be the same size, ply and
brand as originally installed on the machine. Please refer to the
JLG Parts Manual for the part number of the approved tires for
a particular machine model. If not using a JLG approved
replacement tire, we recommend that replacement tires have
the following characteristics:
• Equal or greater ply/load rating and size of original
• Tire tread contact width equal or greater than origi-
nal
• Wheel diameter, width, and offset dimensions equal
to the original
• Approved for the application by the tire manufac-
turer (including inflation pressure and maximum tire
load)
Unless specifically approved by JLG Industries Inc. do not
replace a foam filled or ballast filled tire assembly with a pneu-
matic tire. When selecting and installing a replacement tire,
ensure that all tires are inflated to the pressure recommended
by JLG. Due to size variations between tire brands, both tires
on the same axle should be the same.
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.
Following the recommended sequence, tighten nuts
per wheel torque.
4. Wheel nuts should be torqued 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)
1
2
3
4
5
6
7
8
9