MAINTENANCE AND LUBRICATION
3-17
TABLE OF CONTENTS
Removal
1. Chock all tractor and trailer wheels and drain the air
system.
2. Mark the brake chamber for proper air line port
alignment for reassembly.
3. CAGE THE POWER SPRING following the steps
outlined in “Caging the Power Spring” on
page 4-16.
4. Disconnect the slack adjuster from the connecting
rod by removing the clevis pin (See Figure 4-12.)
5. Mark all air service lines for proper reinstallation and
disconnect from the brake chamber.
6. Remove the brake chamber from the axle brackets.
Installation
1. CAGE THE POWER SPRING following the steps
outlined in “Caging the Power Spring” on
page 4-16.
2. Position the inlet ports by loosening the service
chamber clamp bands and rotating center housing
such that ports are located according to alignment
marks made during disassembly, then retighten the
clamp bands.
3. Position the breather hole in the downward facing
position by loosening the clamp bands on the spring
brake chamber and rotating the chamber housing
until the breather hold faces downward. Retighten
the clamp bands.
4. Remount the brake chamber on the axle brackets
and reconnect the air service hoses and the slack
adjuster connecting rod (See Figure 4-12.)
IMPORTANT
Be sure the service line on the service chamber port
and the emergency line is on the spring brake port.
5. 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.
6. Ensure that the clamp band is properly seated and
tight before uncaging the power spring.
Figure 4-12: Slack Adjuster
SLACK ADJUSTER
CLEVIS
PUSHROD
JAM NUT
COTTER PIN
1/2” CLEVIS PIN
COTTER PIN
1/4” CLEVIS PIN
INSTALLATION
GUIDE
CAMSHAFT
ADJUSTMENT HEX
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