JLG 660SJ Service Manual - Manual (Page 45)

SECTION 3 - CHASSIS & TURNTABLE
3121298 – JLG Lift – 3-1
SECTION 3. CHASSIS & TURNTABLE
3.1 TIRES & WHEELS
Tire Inflation
Pneumatic tire air pressure must be equal to air pressure sten-
ciled on side of JLG product or rim decal for safe and proper
machine operation.
Tire Damage
PNEUMATIC TIRES
JLG Industries, Inc. recommends when any cut, rip, or tear is
discovered that exposes sidewall or tread area cords in the tire,
measures must be taken to remove the JLG product from ser-
vice immediately. Arrangements must be made for replace-
ment of the tire or tire assembly.
POLYURETHANE FOAM FILLED TIRES
JLG Industries, Inc. recommends when any of the following are
discovered, measures must be taken to remove the JLG prod-
uct from service immediately and arrangements made for
replacement of tire or tire assembly:
• Smooth, even cut through cord plies which exceeds
3" (7.5 cm) in total length.
• Tears or rips (ragged edges) in cord plies which
exceeds 1" (2.5 cm) in any direction.
• Punctures which exceed 1" in diameter.
• Damage to bead area cords.
NOTE: If a tire is damaged but within above criteria, it must be
inspected daily to ensure damage does not exceed allow-
able 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 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. When selecting and installing a replacement tire,
ensure all tires are inflated to pressure recommended by JLG.
Due to size variations between tire brands, both tires on the
same axle should be identical.
Wheel Replacement
Rims installed on each product model are designed for stabil-
ity 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 unsafe stability condi-
tions.
Wheel Installation
WHEEL NUTS MUST BE INSTALLED AND MAINTAINED AT PROPER TORQUE TO
PREVENT LOOSE WHEELS, BROKEN STUDS, AND DANGEROUS SEPARATION OF
WHEEL FROM AXLE. USE ONLY NUTS MATCHED TO CONE ANGLE OF 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.
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