5-2 F-1005-1018
TROUBLESHOOTING GUIDE
TABLE OF CONTENTS
Tires - Wheels - Suspension
Most tire, wheel, and suspension related problems are
due to excessive loads, extreme conditions, and
improper maintenance. Tire, wheel, and suspension
problems can be easily detected and solved by checking
the following guide. For maintenance procedures, refer to
the following sections:
• “Hydraulic System” on page 4-7
• “Alignment” on page 4-13
• “Hub and Drum Maintenance” on page 4-23
• “Wheel Bearing Lubrication and Adjustment” on
page 4-25
• “Tire Maintenance” on page 4-25
PROBLEM PROBABLE CAUSE SOLUTION
VIBRATIONS WHILE DRIVING Improper tire inflation Inflate to proper pressure (See “Tire
Inflation” on page 4-25.)
Tires cupped or have flat spots Replace tires.
Wheels bent or loose Replace or tighten.
Tires incorrectly mounted Remount
(See “Mounting Tire and
Wheel” on page 4-27.)
Mud in wheels Clean wheels.
Tire(s) out of balance Balance tires.
Brakes dragging Locate cause and repair.
Object(s) stuck between duals Remove object(s).
RAPID TIRE WEAR/DETERIORATION:
CENTER TREAD WEAR Over inflation Deflate to correct inflation
(See “Tire
Inflation” on page 4-25.)
SHOULDER TREAD WEAR - BOTH
SHOULDERS
Under inflation Increase inflation to correct PSI. Check
axle alignment
(See “Tire
Inflation” on page 4-25.)
Overload Loads are above rated tire capacity. DO
NOT load above rated tire capacity.
SHOULDER TREAD WEAR - ONE
SHOULDER
Axle damage Straighten or replace axle (See “Axle
Alignment” on page 4-15.)
Axles not parallel Check axle alignment.
OVERALL TREAD WEAR Overloading Check tire load rating.
High speeds Adjust speed according to road and load
conditions.
Incorrect dual matching Properly match dual tires (See “Tire
Matching” on page 4-26.)
TIRE FLAT SPOTS Quick stops Adjust braking practices.
Grabbing brakes Adjust brakes properly
(See “Brake
Adjustment” on page 4-18.)
Worn or loose wheel bearings Adjust or replace as needed (See
“Hub and Drum Maintenance”
on page 4-23.)
Out of balance wheels and tire Balance wheels and tires.
Check ABS system function.
UNEVEN WEAR Suspension bushings worn Replace bushings (See “Hub and
Drum Maintenance” on
page 4-23.)
Worn or loose wheel bearings Adjust or replace as needed.
Out of balance wheels and tires Balance wheels and tires.
RIM FAILURE*:
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