BRAKES (CONTINUED)
SYMPTOM
PROBLEM: REMEDY
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.
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.
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.
Tractor pressure too low:
Adjust to provide 105 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.EX-
CESSIVE 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.
5-4
Summary of Contents for 345B
Page 3: ...MODEL 345B TRAILER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO ...
Page 8: ......
Page 12: ......
Page 22: ...3 10 Figure 3 4 Steps for Loading and Unloading ...
Page 26: ...3 14 Figure 3 7 Rear Impact Guard and Antilock Brake System ...
Page 30: ......
Page 35: ...4 5 Figure 4 2 345B Wiring Diagram ...
Page 36: ...4 6 Figure 4 3 Remote Wiring Diagram ...
Page 41: ...4 11 Figure 4 5 Examples of Camber Figure 4 6 Checking Axle for Bend ...
Page 46: ...4 16 Figure 4 10 Axle and Brake Assembly ...
Page 50: ...4 20 Figure 4 13 Outboard Mount Hub and Drum Figure 4 14 Inboard Mount Hub and Drum ...
Page 54: ...4 24 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence ...
Page 65: ...5 9 NOTES ...