Hino 600, Руководство по ремонту, Страница: 352 / 451

SERVICE BRAKE (FULL AIR BRAKE) BR02–74
(3) Automatic Slack Adjuster onto the Camshaft
a.
Check the camshaft and bushings and seals for wear and corro-
sion. Turn the camshaft by hand to check for smooth operation.
Repair or replace parts as required.
b. Apply the service brake and spring brake several times. Check
that the chamber return spring retracts the push rod quickly and
completely. If necessary, replace the return spring or the air
chamber.
c. Verify that the new automatic slack adjuster is the same length as
the one you are replacing. Refer to Table below.
Chamber and Automatic Slack Adjuster Sizes
! WARNING
Before you service a spring chamber, carefully follow the manufac-
turer's instructions to compress and lock the spring to completely
release the brake. Verify that no air pressure remains in the service
chamber before you proceed. Sudden release of compressed air can
cause serious personal injury and damage to components.
d. If the vehicle has spring brakes, follow the chamber manufac-
turer's instructions to compress and lock springs to completely
release the brakes. Verify that no air pressure remains in the ser-
vice chambers.
! CAUTION
Most Meritor automatic slack adjusters manufactured after January
1990 have lubrication holes in the gear splines. Do not operate the
actuator rod before you install the slack adjuster. Lubricant can pump
through the holes and onto the splines. Damage to components can
result.
e. If the automatic slack adjuster gear has a 10-tooth spline, apply
Meritor specification O-637 (part number 2297-U-4571) anti-seize
compound, or equivalent. This specification is a corrosion-control
grease. Do not mix this grease with other greases.
NOTICE
Install the slack adjuster so that you can remove a conventional pawl
or disengage a pull pawl when you adjust the brake.
f. Install the slack adjuster onto the camshaft. Position the slack
adjuster so that you can access the pawl when you adjust the
brake.
g. Verify that camshaft axial end play is 0.005-0.060-inch (0.127-
1.52 mm).
• If axial end play exceeds 0.060-inch (1.52 mm): Remove the snap
ring. Add an appropriate number of spacing washers to achieve the
correct specification.
h.
Install the clevis onto the push rod.
Length of Slack Adjuster
(Inches) Size of Chamber (Square Inches)
5 9*, 12*, 16, 20, 24, 30
5-1/2 9*, 12*, 16, 20, 24, 30, 36
6 24, 30, 36
6-1/2 30, 36
* Use an auxiliary spring on slack adjusters used with these size cham-
bers. A size 9 or 12 chamber return spring cannot supply enough spring
tension to completely retract the slack adjuster.