Landoll 330B, Operator'S Manual

Page: 45 / 64

IMPORTANT
BE SURE THE SERVICE LINE IS ON THE SERV-
ICE CHAMBER PORT AND THE EMERGENCY
LINE IS ON THE SPRING BRAKE PORT.
d. Check for leakage by charging the air sys-
tem to a minimum of 90 psi and applying soap
suds to the brake chamber and connections.
If a growing bubble is detected or bubbles are
blown away, locate the source of the leak and
repair.
e. Insure that the clamp band is properly
seated and tight before uncaging the power
spring.
4-8.3 Tandem Relay Valve Maintenance
Every 3600 operating hours, 100,000 miles, or
yearly, the Relay Emergency Valve should be dis-
assembled, cleaned, and lubricated by a trained
technician.
WARNING
REPAIR OR REPLACEMENT OF THE
RELAY/EMERGENCY VALVE IS A
COMPLEX OPERATION AND SHOULD
BE PERFORMED BY TRAINED SERV-
ICE PERSONNEL. CONTACT A LAN-
DOLL AUTHORIZED SERVICE CENTER
FOR SERVICING.
4-8.4 Brake Assembly Maintenance
The brake assemblies should be inspected and
adjusted every 2,000 miles or monthly. Examine
the brake linings visually to locate the lining show-
ing the greatest amount of wear. The wheel and
drum should be removed and the linings replaced
if the thinnest portion of the lining is 3/8 in. (9.5
mm) or less. Do not allow the linings to wear thin
enough that the lining rivet contacts the drum. (See
Figure 4-10) .
WARNING
DO NOT ALLOW GREASE TO CON-
TACT BRAKE LININGS AS THIS
COULD RESULT IN REDUCED BRAK-
ING PERFORMANCE.
a. Brake Adjustment . Slack adjusters pro-
vide the means for routine brake adjustment
to compensate for lining wear. Inspect and
adjust slack adjusters weekly or at 2,000 mile
intervals.
1. To check adjustment release brakes.
2. Measure the distance (D1) from the face of
the brake air chamber to the center of the
slack adjuster linkage pin (See Figure
4-12).
3. Apply brakes.
4. Repeat step 2 to measure the distance
(D2).
5. Subtract the two distances to find the air
chamber push rod travel. The total travel of
the brake push rod must be less than 1-3/4"
to meet Federal “IN-SERVICE” criteria. It is
advisable to adjust all brakes on the same
axle to within 1/2" of each other to prevent
unbalanced braking.
4-17
Figure 4-12 Checking Brake Adjustment