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Installation

To avoid possible injury, proper precautions must be taken to prevent automatic actuation of the brake chambers while removing or installing slack adjusters. Always block the wheels or mechanically secure the vehicle. Spring brakes must be mechanically caged or released with air. All the brakes should be released.


A. Manual Brake Adjuster Removal
1. Remove the brake chamber push rod clevis pin.
2. Remove the retaining mechanism from the end of the brake camshaft.
3. Rotate the adjusting hex to back the brake adjuster out of the clevis.
4. Remove the brake adjuster from the spline end of the brake cam shaft.


B. Manual Brake Adjuster Installation
Install the brake adjuster on the cam shaft so the adjustment hex and grease fitting (if so equipped) are accessible for servicing.


Align the brake adjuster arm with centre of the push rod clevis. Install the clevis pin and secure it with a new cotter pin.


Check to be sure the angle formed by the brake adjuster arm and the brake chamber push rod is greater than 90 Deg. when the brake adjuster is in the released position.


Install the brake adjuster retaining mechanism on the end of the brake camshaft, being sure to shim it to less tan 0.060 inch of end play.


Tighten the jam nut on the push-rod-to-clevis attachment (1/2-20 300-400 in.lbs.5/8-18-400 in.lbs)


After installation, make certain there is adequate clearance in both the fully applied and fully released positions. Check to ensure that all the brake adjusters rotate freely and without binding. Adjust the brakes by following the procedure in the next section entitled Brake Adjustment Procedure.


NOTE: All adjustments should be made with cold brake drums and brakes fully released.


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