Landoll 345B, Operator'S Manual

Page: 45 / 66

d. Installation of Brake Unit
1. CAGE THE POWER SPRING following the
steps outlined in Section 4-8.3 a.
2. Position the inlet ports by loosening the
service chamber clamp bands and rotating
the center housing so the ports align with
marks made during disassembly. Then
re-tighten the clamp bands.
3. Remount the brake unit on the axle brackets
and reconnect the air service hoses and the
slack adjuster connecting rod (See Figure
4-11).
IMPORTANT
BE SURE THE SERVICE LINE IS ON THE SERV-
ICE CHAMBER PORT AND THE EMERGENCY
LINE IS ON THE SPRING BRAKE PORT.
e. 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.
f. Insure that the clamp band is properly
seated and tight before uncaging the power
spring.
g. Uncage the power spring according to Sec-
tion 4-8.3 b.
4-8.4 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 COM-
PLEX OPERATION AND SHOULD BE
PERFORMED BY TRAINED SERVICE
PERSONNEL. CONTACT A LANDOLL
AUTHORIZED SERVICE CENTER FOR
SERVICING.
4-8.5 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 4-9) .
WARNING
DO NOT ALLOW GREASE TO CON-
TACT BRAKE LININGS AS THIS
COULD RESULT IN REDUCED BRAK-
ING PERFORMANCE.
a. Brake Adjustment : This trailer is equipped
with automatic slack adjusters which compen-
sate for brake lining wear and keep brakes
adjusted. Brakes should not be adjusted
manually except when relining brakes.
b. Disassembly for 12-1/4" X 7-1/2" Brakes
(See Figure 4-10)
1. Release brakes and back off slack
adjuster.
2. Remove slack adjuster lock ring and slack
adjuster.
3. Remove drum assembly (See Figure
4-10) .
4. Remove anchor pin retainers, washers,
and bushings.
5. Remove anchor pins and brake shoes.
6. Remove brake return springs.
7. Remove camshaft lock ring, spacer washer
and camshaft
8. Remove roller pin retainers.
9. Remove roller pins and rollers from shoes.
10. Remove camshaft bushings and seals from
spider.
11. After removing the shoes, completely
inspect all brake components, servicing
as necessary.
c. Reassembly for 12-1/4" X 7-1/2" Brakes
1. Install new camshaft bushing and seals
into the spider.
IMPORTANT
WHEN INSTALLING CAMSHAFT SEALS, THE
SEAL ON THE SLACK ADJUSTER SIDE IS IN-
STALLED FACING INTO SPIDER. THIS AL-
LOWS GREASE TO PURGE OUTSIDE THE
BRAKE ASSEMBLY WHEN GREASING THE
CAMSHAFT BUSHING.
2. Install cam roller assemblies onto the brake
shoes.
3. Install “D” shaped camshaft washer onto
the camshaft.
4. Install the camshaft into the spider. Install
spacer washer and lock ring retainer on
camshaft before sliding the camshaft
through the camshaft support bracket.
Install the slack adjuster, washer and lock
ring retainer.
4-15