Landoll 345E, Operator'S Manual

Page: 57 / 62

TROUBLESHOOTING
5-5
Brake Drums
For maintenance procedures, refer to the following
sections:
• “Suspension Maintenance” on page 4-9
• “Alignment” on page 4-10
• “Brake System Maintenance” on page 4-13
• “Hub and Drum Maintenance” on page 4-19
• “Wheel Bearing Lubrication and Adjustment” on
page 4-21
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
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 compressor
BRAKE WILL NOT APPLY PROPERLY Flat spot on cam roller or camshaft Replace and lubricate
BRAKE WILL NOT APPLY WHEN
EMERGENCY LINE IS DISCONNECTED Initial air pressure too low Allow air system to build up to minimum 90
PSI and stabilize
Defective relay valve Repair or replace valve
Air line leak Locate leak and repair
Brake chamber leak Locate leak and repair or replace
ABS WARNING LIGHT STAYS ON Refer to Rockwell WABCO ABS maintenance manual supplied with trailer for system
function and use of blink code diagnostics.
PROBLEM PROBABLE CAUSE SOLUTION
PROBLEM PROBABLE CAUSE SOLUTION
EXCESSIVE LOSS OF BRAKES OR
FADING Overheated brake drums Check for defective or misadjusted brake
linings, distorted or over-machined
drums. Also check for operating
conditions or loads that create severe
or excessive brake applications.
BRAKES PULL TO EITHER SIDE Drums of different diameters Replace with drums of same diameter.
Foreign matter in drums Clean drums out
ROUGH OR NOISY BRAKING ACTION Defective drums Pull drums and inspect for any of the
following. Heat spotted drums, grease
spotting, blue drums, scored drums,
excessive wear at rivet holes or edges,
polished drums, out of round drums,
unbalanced drums, worn/damaged
brake components, foreign matter in
drums. Correct situation or replace
defective part(s).
VIBRATION IN RIDE Defective drums or out-of-round Replace drums
Out-of-balance drums Balance drums