Landoll 900B Series, Operator'S Manual

Page: 77 / 82

BRAKES (CONTINUED)
SYMPTOM PROBLEM: REMEDY
ALL BRAKES DO NOT RELEASE
Air system improperly connected to tractor: tighten or
adjust connections.
Brake valve on tractor is applied: release brake.
Relay emergency valve in emergency position: check line
pressure and check valve.
Restricted tubing or line: locate restriction and remove.
Defective tractor protection valve: troubleshoot tractor air
system.
Parking brakes locked: troubleshoot air system.
Moisture in air system: Check air system
Tractor pressure too low: Adjust to provide 90 psi min.
INSUFFICIENT BRAKES Brakes need adjusting: adjust brakes.
Brakes need lubricating: lubricate brakes.
Brakes need relining: reline brakes.
Low air pressure: troubleshoot air system.
Defective relay emergency valve: repair or replace.
Brakes overheated: stop and allow brakes to cool, locate
cause of overheating.
BRAKES GRABBING
Grease on brake linings: reline brakes.
Brake rigging binding: align brakes or replace bent parts.
Defective brake valve on tractor: repair or replace valve.
Defective relay emergency valve: repair or replace valve.
EXCESSIVE LEAKAGE WITH
BRAKES RELEASED Relay emergency valve leaking: repair or replace valve.
Leaking tubing or hose: replace defective part.
EXCESSIVE LEAKAGE WITH
BRAKES APPLIED Relay emergency valve leaking: repair or replace valve.
Leaking brake chamber diaphragm: replace diaphragm.
Call Factory or see qualified Trailer/Brake Technician
Leaking tubing or hose:
replace defective part.
EXCESSIVE LEAKAGE WITH
EMERGENCY SYSTEM ONLY
APPLIED - NO LEAKAGE WITH
NORMAL BRAKING Defective relay emergency valve: repair or replace valve.
EXCESSIVE WATER PRESENT IN
BRAKE SYSTEM Reservoir not drained often enough: drain reservoir daily.
EXCESSIVE OIL PRESENT IN
BRAKE SYSTEM
Compressor on tractor passing excessive oil: repair com-
pressor.
BRAKE WILL NOT APPLY
PROPERLY Flat spot on cam roller or camshaft: replace and lubricate.
5-5