Landoll 325C, Operator'S Manual

Page: 56 / 80

4-9 BRAKE SYSTEM MAINTENANCE
WARNING
1. WHEN CRAWLING UNDER THE
SEMITRAILER IS NECESSARY, CHOCK
ALL WHEELS OF THE TRAILER AND
TRACTOR. WHEN JACKING IS NECES-
SARY, CHOCK ALL WHEELS AND
SUPPORT THE SEMITRAILER UNDER-
CARRIAGE WITH JACK STANDS SUF-
FICIENT TO WITHSTAND THE WEIGHT
OF THE SEMITRAILER AND LOAD.
F A I L U R E T O T A K E A D E Q U A T E
SAFETY MEASURES MAY RESULT IN
SERIOUS PERSONAL INJURY OR
DEATH.
2. USE GREAT CARE IF WHEELS OR
BRAKE DRUMS MUST BE HANDLED.
THEY MAY BE VERY HOT AND CAN
CAUSE SERIOUS BURNS.
4-9.1 General
A daily general inspection will reveal the most
common problems found in the spring brake sys-
tem. This inspection should include the following:
a. Check air hoses for chafing, bends, kinks,
or damaged fittings. Replace defective hoses.
b. Check the brake system for loose, missing,
deformed, or corroded fasteners. Replace
and tighten defective hardware.
c. Check brake linings for excessive wear or
distortion.
d. Drain air reservoir daily. A drain cock on the
bottom of each air reservoir vents the tank to
drain collected water and oil. If held open, air
pressure in the tanks is relieved, causing the
emergency or parking brakes to be applied
(See Figure 4-15).
4-9.2
Spring Air Brake Chambers
Check for faulty units. Check the condensation
holes on the underside of the brake chambers to
make sure they are open. The spring brake has
two brake chambers, a service chamber and an
emergency chamber or spring chamber. Service
brake chambers should be disassembled and
cleaned at 50,000 miles or yearly. The diaphragm
and any marginal parts should be replaced. When
replacing the service diaphragm, replace the corre-
sponding parts for the other chamber on the same
axle (to aid in even brake application and release).
Examine yoke pin for wear and replace as neces-
sary. The spring chamber should not be serviced.
Replace entire unit (both service and spring cham-
ber) if spring chamber becomes faulty.
WARNING
THE SPRING BRAKE CHAMBER EM-
P L O Y S
A S P R I N G W I T H H I G H
FORCES. SERVICE SHOULD NOT BE
ATTEMPTED. SERIOUS INJURY OR
DEATH MAY RESULT.
4-20
Figure 4-15 Drain Cock Locations