SECTION 3 - CHASSIS & TURNTABLE
3-18
3121200
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 abnor-
mally scored or gouged. When replacement is necessary, it is
important to replace both shoes on each brake and both
brakes of the same axle to maintain balance in the braking sys-
tem.
After replacement of the brake shoes and linings, the brakes
must be re-burnished to seat in the new components. This
should be done by applying the brakes 20 to 30 times from an
initial speed of 40 mph, slowing the vehicle 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 sur-
face.
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 neces-
sary.
3.7
TIRES & WHEELS
Tire Inflation
Tire pressure is the most important factor in tire life. Inflation
pressure should be as recommended and stated on the side-
wall of the tire. Pressure should be checked cold before opera-
tion. 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 bubble, cut or bulge;
and replace a damaged tire before towing 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 pinpoint
the causes and solution of tire wear problems.
Table 3-2. 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 bal-
ance tires
Flat Spots
Wheel lockup and
tire
skidding
Avoid sudden stops
when possible and
adjust brakes.
Summary of Contents for T500J
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