JLG 4394RT Service Manual - Manual (Page 38)

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3-2 – JLG Lift – 3121249
• 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 ensure the
damage has not propagated beyond the allowable crite-
ria.
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 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 pneumatic tire. When selecting and installing a replace-
ment 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 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 diam-
eter, 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 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 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 chart.
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.
Table 3-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
40 lb-ft
(55 Nm)
100 lb-ft
(136 Nm)
170 lb-ft
(230 Nm)