JLG T350 Service Manual - Manual (Page 43)

SECTION 3 - CHASSIS & TURNTABLE
3121198 – JLG Lift – 3-7
WHEEL CYLINDERS
Inspect for leaks and smooth operation. Clean with brake
cleaner and flush with fresh brake fluid. Hone or replace
as necessary.
BRAKE LINES
Check for cracks, kinks, or blockage. Flush with fresh
brake fluid. Bleed system to remove all air. Replace as
necessary.
SHOES AND LININGS
Inspect visually. Replace if the lining is worn to within 1/16"
(1.6 mm) or less, contaminated with grease or oil, or
abnormally scored or gouged. When replacement is nec-
essary, it is important to replace both shoes on each brake
and both brakes of the same axle to maintain balance in
the braking system.
After replacement of the brake shoes and linings, the
brakes must be re-burnished to seat in the new compo-
nents. This should be done by applying the brakes 20 to
30 times from an initial speed of 40 mph, slowing the vehi-
cle to 20 mph. Allow ample time for the brakes to cool
between applications. This procedure allows the brake
shoes to seat in to the drum surface.
HARDWARE
Check all hardware. Check shoe retractor spring, hold
down springs, and adjuster springs for stretch or wear.
Replace as required.
DRUMS
Check drums for scoring, cracking, or uneven wear. Turn
drum smooth only if under maximum diameter. Replace
as necessary.
3.6 TIRES & WHEELS
Tire Inflation
Tire pressure is the most important factor in tire life. Infla-
tion pressure should be as recommended and stated on
the sidewall of the tire. Pressure should be checked cold
before operation. Do not bleed air from tires when they are
hot. Check inflation pressure weekly during use to insure
the maximum tire life and tread wear.
Tire Wear
Inspect tires periodically for wear or damage. Tires with
less than 1/16" (2 mm) tread depth or visible wear bands
require replacement.
A bubble, cut or bulge in a sidewall can result in a tire
blowout. Inspect both sidewalls of each tire for any bub-
ble, cut or bulge; and replace a damaged tire before tow-
ing the trailer.
WORN, DAMAGED OR UNDER-INFLATED TIRES CAN CAUSE LOSS
OF CONTROL, RESULTING IN DAMAGE, SERIOUS INJURY OR
DEATH. INSPECT TIRES BEFORE EACH TOW.
The following tire wear diagnostic chart will help you pin-
point the causes and solution of tire wear problems.
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
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 and Tire Replacement
Replacement wheels must have the same diameter, width,
and profile as the original. Replacement tires must be the
same size, ply rating, and load range as the tire being
replaced. Refer to the Vehicle Identification plate on the
chassis for wheel and tire specifications.
Table 3-1. Tire Wear
Wear Pattern Cause Action
Center
Wear
Over Inflation Adjust Pressure
to value specified
in Section 7
Edge Wear Under Inflation Adjust Pressure
to value specified
in Section 7
Cupping Out of balance Check bearing
adjustment and
balance tires
Flat Spots Wheel lockup
and tire
skidding
Avoid sudden
stops when possi-
ble and adjust
brakes.