Landoll 330C, Руководство оператора

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MAINTENANCE AND LUBRICATION
4-19
Brake Adjustment
Slack adjusters provide 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 4-11.)
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.
6. To adjust, release brakes.
7. Place a 9/16” box end or socket wrench on the slack
adjuster adjusting nut
(See Figure 4-11) , and push in
on the locking sleeve.
8. Adjust by rotating the adjusting nut counterclockwise
to loosen the brake and clockwise to tighten the
brake.
9. Remeasure air chamber push rod travel from release
to full brake application. If the adjustment is not within
the “IN-SERVICE” criteria readjust. If the adjustment
has brought the travel to within specifications,
proceed to the next step.
10. Remove wrench from slack adjuster. Check locking
sleeve to verify that it has sprung back out and is
locking the adjusting nut. If not, the adjuster will have
to be rotated slightly.
Disassembly
1. Release brakes and back off slack adjuster.
2. Remove slack adjuster lock ring and slack adjuster.
3. Remove drum assembly (See Figure 4-9.)
4. Disengage the roller retainers from the rollers.
5. Press down on the bottom brake shoe and remove
the lower cam roller. Lift the top shoe and take out
the top cam roller.
6. Lift out the shoe retractor spring, which is now free of
tension.
7. Swing the lower shoe back approximately 180° to
relieve the tension on the shoe keeper springs.
Remove the springs and slip the shoes off the anchor
pins.
8. Remove camshaft lock ring, spacer washer(s) and
camshaft.
9. After removing the shoes, completely inspect all
brake components, servicing as necessary.
Reassembly
1. Install new anchor pin bushings, camshaft bushing,
and camshaft seals into the spider.
IMPORTANT
When installing camshaft seals, the seal on the slack
adjuster side is installed facing into the spider. This
allows grease to purge outside the brake assembly
when greasing the camshaft bushing.
2. Install cam roller, retainer clip and retractor spring
retainers onto the brake shoes.
3. Install 1/8” thick camshaft washer onto the camshaft.
4. Install the cam shaft 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 the brake keeper springs onto the shoes.
Install shoes onto the spider by placing shoes in
place on the anchor pins, then “wrap” the two shoes
into place about the spider.
6. Install the shoe retractor spring onto the shoes.
7. Connect the slack adjuster to the brake chamber
pushrod.
8. Adjust brakes as outlined in brake adjustment
procedures.