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IMPORTANT
Be sure the service line is on the service chamber
port and the emergency line is on the spring brake
port.
4. Check for leakage by charging the air system 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.
5. Insure that the clamp band is properly seated and
tight before uncaging the power spring.
6. Uncage the power spring according to "Uncaging
the Power Spring in the Spring Chamber" on
page 4-14.
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.
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.
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 showing 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.)
Do not allow grease to contact brake linings as
this could result in reduced braking performance.
Brake Adjustment
This trailer 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.
WARNING
WARNING
MAINTENANCE AND LUBRICATION
Disassembly for 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.
Reassembly for Brakes
1. Install new camshaft bushing and seals into the
spider.
IMPORTANT
When installing camshaft seals, the seal on the slack
adjuster side is installed facing into spider. This
allows 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
"Adjusting Slack Adjuster" on page 4-18.
4-15
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