WHEELS/RIMS & TIRES
BODY AND CHASSIS
REAR IMPACT GUARDS (RIG)
ELECTRICAL & CONSPICUITY
9.0 SAFETY DEFECT REPORTING
The leaf springs in a trailer suspension flex and work while assisting the transfer of the trailer and the cargo weight to the ground. Periodic inspections and checks are required to insure achieving satisfactory performance. These inspections should be made on a regular scheduled basis. The checks should be scheduled at least every 12 months or at once whenever any abnormality, poor operation or unusual wear on parts is noted. The frequency of servicing required depends on the severity of the operating conditions. After a short initial break-in period of 1000 to 2000 miles check the suspension components and verify the alignment and torque on the spring, axle and wheel nuts per the table of recommended bolt torques at the end of this section.
Check axle alignment. Also check after replacing any suspension parts or if the trailer does not track behind the tractor or if unusual tire wear is noted. Move trailer forward onto a flat level surface. Inflate tires to rated pressure and check the kingpin to the front axle end dimensions. They must be within plus or minus “0” to expect maximum tire mileage. The front axle to the rear axle end dimensions must be within plus or minus “0” to expect maximum tire mileage.
Check all bushings for wear. Replace any worn bushings and re-torque the mounting bolts and nuts to the manufacturer’s recommended specifications or refer to the table at the end of this section.
Check the equalizer for obstructions that can limit movement and cause damage or limit load transfer between axles.