SECTION 3 - CHASSIS & TURNTABLE
31215031
3-1
SECTION 3. CHASSIS & TURNTABLE
3.1
TIRES AND WHEELS
Tire Damage
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.
• Smooth, even cut through cord plies which exceeds
3 inches (7.5 cm) in total length.
• Tears or rips (ragged edges) in cord plies which
exceeds 1inch (2.5 cm) in any direction.
• Any punctures which exceed 1inch in diameter.
• Any damage to the bead area cords of the tire.
If a tire is damaged but within above criteria, it must be
inspected daily to ensure damage does not exceed allowable
criteria.
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 part number of approved tires for a par-
ticular machine model. If not using a JLG approved replace-
ment 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 original
• Wheel diameter, width, and offset dimensions equal to the
original
• Approved for the application by the tire manufacturer
(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. Due to size variations between tire brands, both
tires on the same axle should be the same.
Wheel Replacement
Rims installed on each product model have been designed for
stability requirements which consist of track width and load
capacity. Size changes such as rim width, center piece loca-
tion, larger or smaller diameter, etc., without written factory
recommendations, may result in unsafe stability conditions.
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 lug nuts to proper torque to prevent wheels from
coming loose. Use a torque wrench to tighten fasteners. If you
do not have a torque wrench, tighten fasteners with a lug
wrench, then immediately have a service garage or dealer
tighten lug nuts to proper torque. Over-tightening will break
studs or permanently deform mounting stud holes in 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.
Figure 3-1. Wheel Lug Nut Tightening Sequence
3.
The tightening of the nuts should be done in stages. Fol-
lowing the recommended sequence, tighten nuts per
wheel torque chart.
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)
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.
Go to
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