Landoll 600B Series, Operator'S Manual

Page: 78 / 84

5-3 BRAKES
For maintenance procedures, see Section 4-8.
SYMPTOM PROBLEM: REMEDY
NO BRAKES OR BRAKES
ARE INTERMITTENT
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 re-
pair. Check ABS system function.
SINGLE BRAKE DRAGGING
OR LOCKED
Broken internal brake component: locate and replace broken
part.
Flat spot on cam roller or cam shaft: replace and lubricate.
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.
UNEVEN BRAKES See “SINGLE BRAKE DRAGGING OR LOCKED”
Restriction in hose: locate restriction and remove.
Worn brake linings: reline brakes.
Grease on linings: reline brakes.
Broken slack adjuster: replace slack adjuster.
Leaking brake chamber diaphragm: replace diaphragm.
BRAKES APPLY TOO SLOWLY Brakes need adjusting or lubrication: adjust or lubricate as
needed.
Low air pressure in brake system (below 105 PSI): check
tractor air system.
Restricted tubing or hose: locate restriction and remove.
Defective relay valve: clean or replace.
Call Factory or see qualified Trailer/Brake Technician
BRAKES RELEASE TOO SLOWLY Brakes need adjusting or lubrication: adjust or lubricate as
needed.
Brake rigging binding: align brakes or replace bent parts.
Exhaust port of relay valve restricted or plugged: clean
valve.
Tractor pressure too low: Adjust to provide 105 psi min.
5-4