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TIRES - WHEELS - SUSPENSION (CONTINUED)
SYMPTOMS
BROKEN STUDS*
*REPLACE BROKEN STUDS BEFORE USING THE SEMITRAILER!
TRAILER TRACKING PROBLEMS:
TRACKS TO ONE SIDE
TRACKS TO EITHER SIDE
AIR RIDE HEIGHT PROBLEMS:
TOO HIGH
TOO LOW
UNEVEN FROM SIDE TO SIDE
5-3 BRAKES
SYMPTOM
NO BRAKES OR BRAKES
ARE INTERMITTENT
SINGLE BRAKE DRAGGING
OR LOCKED
Over tightening: use correct torque when mounting.
Axle alignment: re-align axle.
Broken or bent springs or equalizers: replace defective
parts.
Axles not parallel: realign axles
Axle to control valve linkage: readjust linkage.
Height Control Valve internal leak: repair or replace Valve.
Axle to control valve linkage: readjust linkage.
Height Control Valve filter plugged: clean or replace valve.
Pressure Protection Valve filter plugged: clean or replace
valve.
System air pressure low (65 PSI minimum required): trou-
bleshoot air supply.
Linkage adjustment: readjust linkage.
Exhaust port plugged: clean or replace valve(s).
Height control valve internal leak: repair or replace valve.
Supply line to one height control valve pinched, restricted,
or plugged: repair or replace line.
Sections 4-8.
Brake air system improperly connected: reconnect hand
valves properly.
Relay/Emergency valve plugged: clean valve.
Defective tractor protection valve: repair or replace.
Restricted tubing or hose line: locate and eliminate restric-
tion.
Broken line: locate break and repair.
Tractor air system failure: troubleshoot tractor air system and
repair.
Broken internal brake component: locate and replace broken
part. Flat spot on cam roller or cam shaft: replace and lubri-
cate.
Improper adjustment: adjust slack adjusters.
Spider bushing or cam bracket bushing binding: lubricate or
replace bushing.
Improper lubrication: lubricate per Figure 4-1.
Worn brake shoe bushing: replace bushing.
Brake drum distortion: replace drum.
Broken brake chamber spring: replace spring.
Brake chamber pushrod binding: re-align brake chamber
bracket.
Air brake line loose or broken: tighten or repair.
PROBLEM: REMEDY
PROBLEM: REMEDY
5-3
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