5-2 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 check-
ing the following guide.
SYMPTOM
PROBLEM: REMEDY
VIBRATIONS WHILE DRIVING
Improper tire inflation:
inflate to proper pressure.
Tires cupped or have flat spots:
replace tires.
Wheels bent or loose:
replace or tighten.
Tires incorrectly mounted:
remount.
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.
SHOULDER TREAD WEAR - BOTH
SHOULDERS
Under inflation:
increase inflation to correct PSI. Check axle
alignment.
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.
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.
Front and rear axle suspension air bags not inflated:
Adjust
front and rear axle ride height control valves to proper settings.
TIRE FLAT SPOTS
Quick stops:
adjust braking practices.
Grabbing brakes:
adjust brakes properly.
Worn or loose wheel bearings:
adjust or replace as needed.
Out of balance wheels and tire:
balance wheels and tires.
Check ABS system function.
Front and rear axle suspension air bags not inflated:
Adjust
front and rear axle ride height control valves to proper settings.
UNEVEN WEAR
Suspension bushings worn:
replace bushings.
Worn or loose wheel bearings:
adjust or replace as needed.
Out of balance wheels and tires:
balance wheels and tires.
5-2
Summary of Contents for 825A
Page 8: ......
Page 12: ......
Page 14: ...3 2 Figure 3 1 Model 825 Trailer Terminology Figure 3 2 Service Hookups...
Page 18: ...3 6 Figure 3 3 Hydraulic Controls...
Page 22: ...3 10 Figure 3 5 Swingout Outrigger Platform Extension...
Page 24: ...3 12 Figure 3 6 Gooseneck Attachment to Frame...
Page 34: ......
Page 36: ...4 2 Figure 4 1 Lubrication Points...
Page 40: ...4 6 Figure 4 2 Model 825A Wiring Diagram...
Page 43: ...4 9 Figure 4 4 Tandem Axle Air Ride Suspension System...
Page 44: ...4 10 Figure 4 5 Tandem Axle W Flip Air Ride Suspension System...
Page 47: ...4 13 Figure 4 8 Checking Axle Alignment Figure 4 9 Examples of Camber...
Page 52: ...4 18 Figure 4 12 Axle and Brake Assembly...
Page 59: ...4 25 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence...
Page 69: ...NOTES 5 9...
Page 70: ......
