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)
. Lubricate brake assembly per
Figure
4-1, Lubrication Points
and
Table 4-2, Mainte-
nance Schedule.
WARNING
DO NOT ALLOW GREASE TO CON-
TACT BRAKE LININGS AS THIS
COULD RESULT IN REDUCED BRAK-
ING PERFORMANCE.
a. Brake Adjustment
This semitrailer is equipped with automatic
slack adjusters which compensate 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.
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
(See Figure 4-10)
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.
5.
Install shoes, anchor pin bushings, anchor
pins, and spacers onto spider. Install
anchor lock rings.
IMPORTANT
ALWAYS USE ALL NEW SPRINGS WHEN
SERVICING BRAKES.
6.
Install brake return spring.
7.
Connect slack adjuster to brake chamber
pushrod.
8.
Adjust automatic slack adjuster as outlined
in
Section 4-8.6b.
d. Disassembly for 16-1/2" x 7" 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.
Disengage the roller retainers from the
rollers.
4-19
Summary of Contents for 317C
Page 8: ......
Page 14: ...3 2 Figure 3 1 Front Trailer Terminology Figure 3 2 Rear Trailer Terminology...
Page 18: ......
Page 24: ...3 12 Figure 3 5 Steps for Loading and Unloading...
Page 30: ...3 18 Figure 3 10 Dock Leveler Operation...
Page 34: ...3 22 Figure 3 12 Front Extension Bulkhead...
Page 36: ...3 24 Figure 3 13 Rear Impact Guard and Antilock Brake System...
Page 40: ...4 2 Figure 4 1 Lubrication Points...
Page 45: ...4 7 Figure 4 2 317C 318C 319C Wiring Diagram...
Page 46: ...4 8 Figure 4 3 Remote Wiring Diagram...
Page 52: ...4 14 Figure 4 6 Checking Axle Alignment Figure 4 7 Examples of Camber...
Page 56: ...4 18 Figure 4 10 Axle and Brake Assembly...
Page 64: ...4 26 Figure 4 16 Mounting Tires and Wheels Figure 4 17 Stud Tightening Sequence...
Page 67: ...4 29 Figure 4 18 Dock Leveler Leg Assembly...
Page 68: ......
Page 78: ...5 10 NOTES...
