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| Illustration 1 | g03734072 |
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View of the rear slack adjuster | |
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| Illustration 2 | g03734073 |
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View of the front slack adjuster | |
Operation of the slack adjusters keeps the timing constant between the brake application and the stopping of the machine. Because of the slack adjuster, the same brake application will work with new brakes or with worn brakes. A slack adjuster is in the brake system for the front brakes and for the rear brakes. The slack adjuster is full of oil.
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| Illustration 3 | g01948838 |
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Components of slack adjuster (3) Outlet to a brake (4) Piston (5) Inlet from control valve (brake) (6) Piston (7) Outlet to a brake (8) Oil chamber (9) Oil passage (10) Small piston (11) Small piston (12) Oil passage (13) Oil chamber (14) Passage for makeup oil (15) Passage for makeup oil | |
When the service brakes are used or when the retarder is used, the control valve (brake) sends oil through inlet (5) of the slack adjuster. The oil pressure in the slack adjuster pushes pistons (4) and (6) away from the center of the slack adjuster. Pistons (4) and (6) push the oil in oil chambers (8) and (13) through outlets (3) and (7) to the brakes in each wheel. This oil initiates the brake application.