BENDIX MC-12 MODULATOR CONTROLLER ASSY Anleitung zur Fehlerbehebung PDF herunterladen (Seite 20)

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Slack Adjusters

The slack adjuster is the link between a brake chamber

or actuator and the S-Cam brake camshaft. Its arm

is fastened to the push rod with a yoke and its spline

is installed on the foundation brake cam shaft. It

transforms and multiplies the force developed by the

chamber into a torque which applies the brakes via

the brake camshaft.

Manual Slack Adjusters

To compensate for the gradual wear on the brake

block lining, slack adjusters are equipped with an

adjusting mechanism, which provides a means of

adjusting for brake lining wear. Slack adjuster models

are designated by a number which represents its

maximum torque rating (e.g. a type 20 unit is rated for

a maximum of 20,000 inch-pounds of torque). Slack

adjusters are available in various arm conﬁ gurations,

lengths and spline types.

The entire slack adjuster operates as a unit, rotating

as a lever with the brake cam shaft as the brakes

are applied or released. The most efﬁ cient braking

action is obtained when the slack adjuster arm travel

is approximately 90 degrees and in the recommended

range of the chamber. Therefore, it is important that

brake adjustments are made as often as necessary.

Automatic Slack Adjusters

Automatic slack adjusters perform the same function

as the standard unit, except that it automatically

adjusts for lining wear. The Bendix design monitors

brake lining to brake drum clearance, thus eliminating

the possibility of over adjustment.

The automatic slack adjuster does not require periodic

manual adjustment, however, the unit does provide

for manual adjustment. All Bendix slack adjusters

incorporate a grease ﬁ tting and/or a tapped hole for

a lube ﬁ tting.

Manual Slack

Adjuster

ASA-5

Automatic

Slack Adjuster

Examples of

Off-set and

Straight Arm

Styles

Adjustment

Mechanism

Lube

Fitting

Spline

Yoke

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 69 70

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