Landoll 317D, Operator'S Manual

Page: 58 / 88

4-18 F-486-1011 Edition
MAINTENANCE AND LUBRICATION
Air Brake Chambers (Type 30)

DANGER

DANGER
The air brake chamber may be serviced while still on the
semitrailer. The following steps describe the procedure
for servicing the air brake chamber.
1. Chock semitrailer wheels.
2. Drain the semitrailer air system of all air and moisture
(See Figure 4-8.)
IMPORTANT
Draining the air system will allow the trailer to roll if
the wheels are not properly chocked.
3. Mark the chamber for proper reassembly alignment,
loosen the clamp bands around chamber, and
remove the chamber head.
4. Remove and replace diaphragm. Check all fasteners
for defects. If defects are found, the defective part
must be replaced.
5. Replace the chamber head and tighten the clamp
band.

WARNING
6. Recharge the semitrailer air system and check the air
chamber for leaks by applying soap suds to the
chamber. A growing bubble or suds being blown
away indicates a leak. Locate the source of the leak
and repair before using the semitrailer.
Tandem Relay Valve Maintenance
Every 3600 operating hours, 100,000 miles, or yearly, the
Relay Emergency Valve should be disassembled,
cleaned, and lubricated by a trained technician
(See
Table 4-2.)

WARNING
Do not use this procedure for trailers with spring
brakes. The force released by dismantling spring
brake chambers can cause a reaction that can
result in serious injury or death.
Completely draining the air reservoir will release
the trailer brakes. Always chock wheels before
releasing brakes. Failure to chock wheels prior to
releasing trailer brakes can result in serious
personal injury or death
.
Repair or replacement of the relay/emergency
valve is a complex operation and should be
performed by trained service personnel. If the
relay or emergency valve needs repair, contact a
landoll authorized service center for servicing.
Repair or replacement of the relay/emergency
valve is a complex operation and should be
performed by trained service personnel. Contact
a Landoll authorized service center for servicing.