BENDIX SLACK ADJUSTERS Manual - Página 3

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SLACK ADJUSTERS MOUNTED IN TENSION OR COMPRESSION

SLACK

ADJUSTER

PROVIDED THE MAXIMUM TORQUE RATING IS NOT EXCEEDED, BENDIX SLACKS CAN BE MOUNTED IN EITHER DIRECTION AND

STILL MEET THE ENGINEERING TEST SPECIFICATION (50K CYCLES AT MAXIMUM RATED LOAD). COMPRESSION MOUNTING IS

NOTE: Some Bendix slack adjusters were manufactured

without a lubrication provision in the body; however,

the slack adjuster may be lubricated through the

cover as follows:

1. Remove rubber plugs from both covers and discard.

2. Determine which side of slack adjuster is accessible for

lubrication and install washer (Pc. No. 230156) and

grease fitting (BW Pc. No. 244017) Alemite #1625 using

Alemite tool #5254 to press grease fitting firmly in place

in cover.

3. Install steel plug (Pc. No. 244400) in other cover, making

certain it is firmly in place.

4. Lubricate slack adjuster. Apply a sufficient amount of

grease to completely fill body cavity.

SERVICE TESTS

1. Apply brakes and check that slack adjusters rotate freely

and without binding.

2. Release brakes and check that slack adjusters return

to the released position without binding.

3. With brakes released, check that the angle formed by

the slack adjuster arm and actuator push rod is greater

than 90 degrees. All slack adjusters should be set at

this same angle.

4. With brakes applied, check that the angle formed by

the slack adjuster arm and actuator push rod is still

slightly greater than 90 degrees. All slack adjusters

should be set at this same angle.

REMOVAL AND INSTALLATION

CAUTION: Before attempting to remove slack adjusters,

proper precautions should be taken so that an automatic

application of the actuators does not occur while removing

or installing slack adjusters, thus causing possible injury.

Decreasing air pressure can cause a sudden full brake

application without warning. Depending on type of system

on vehicle, it maybe necessary to drain all air reservoirs or

mechanically back off spring brake chambers.

BRAKE

CHAMBER

ADJUSTING

SCREW

TENSION

RECOMMENDED AND WILL YIELD A LONGER SERVICE LIFE.

BRAKE

CHAMBER

SLACK

ADJUSTER

ADJUSTING

SCREW

A. REMOVAL

1. Remove the chamber push rod yoke pin.

2. Remove the retaining mechanism from end of brake

cam shaft.

3. Rotate the slack adjuster by turning the adjusting nut.

4. Slide the slack adjuster off of the spline end of the brake

cam shaft.

B. INSTALLATION

1. Install slack adjuster on brake cam shaft so the

adjustment screw and grease fitting (if so equipped) are

accessible for servicing.

2. Install retaining mechanism on end of brake cam shaft

to hold slack adjuster in place.

3. Turn adjusting nut to line up yoke pin hole with arm

hole. Install yoke pin and cotter pin.

4. Refer to steps 3 and 4 under "Service Tests" and make

sure the proper adjustments are made after installing a

slack adjuster.

SLACK ADJUSTER REPLACEMENT

When replacing one type of slack adjuster with another type,

it is necessary to match or exceed the torque rating and

match the arm length, yoke pin diameter, offset spline

diameter and width. It is also necessary to make certain

that there is adequate clearance at release and full stroke.

DISASSEMBLY AND ASSEMBLY

NOTE: Disassembly and assembly instructions apply only

to assemblies with riveted covers. Assemblies with

welded covers are considered non-serviceable and

are replaced as an assembly.

TYPE 20 TO 30 WITH POSITIVE LOCK MECHANISM AND

RIVETED COVER DISASSEMBLY

1. Remove rivets holding covers.

2. Remove welch plug.

COMPRESSION