Bendix Automatic Slack Adjusters
How a Bendix Automatic Slack Adjuster Operates
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When the brakes are applied, the linear travel of the brake actuator’s push rod causes the ASA-5 slack adjuster to rotate the foundation brake camshaft which in turn begins to force the brake shoes into contact with the drum. When the ASA-5 slack adjuster rotates, the yoke assembly pivots on the yoke pin causing the link to be pulled upward.
The teeth on the link mesh with the adjuster mechanism pinion. As the link is pulled it travels first through its free play and then causes the pinion to rotate. Rotation of the pinion is transmitted through the clutch spring to the worm and shaft. Worm and shaft rotation results in worm gear rotation which in turn adjusts (or repositions) the brake camshaft.
When the foundation brake shoes contact the drum, the camshaft begins to resist rotation and friction between the worm gear and worm builds, preventing further rotation of the worm. Brake adjustment ceases at this point and further rotation of the ASA-5 slack adjuster will cause the pinion and clutch spring to slip. The free play between the link teeth and pinion results in a predetermined lining to drum clearance.
Bendix ASA-5 Service Data Sheet with Installation Instructions
How do I measure my air brake slack adjuster? The first step to determining which air brake slack adjuster you need is to measure the diameter of the camshaft at the splines. You will then need to count the splines. Finally, measure the distance from the center of the camshaft hole to the center of the clevis pin hole. This measurement is referred to as the span in the chart below.
You'll also need to be aware of any offset from the center line of the slack adjuster arm to the center of the brake chamber push rod. Most of the slack adjusters listed below are not offset. Offsets will be listed in the notes under the part.
| 1-1/4" Diameter, 10 Spline Camshaft - 5-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065164 | $70.40 | |
| 1-1/4" Diameter, 24 Spline Camshaft - 5-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065167 | $70.40 | |
| 1-1/2" Diameter, 10 Spline Camshaft - 5-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065170 | $70.40 | |
| 1-1/2" Diameter, 10 Spline Camshaft - 6" Span | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065172 | $70.40 | |
| 1-1/2" Diameter, 10 Spline Camshaft - 6-1/2" Span | |||
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No slack adjusters of this brand are available in this size. |
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| 1-1/2" Diameter, 28 Spline Camshaft - 5" Span | |||
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No slack adjusters of this brand are available in this size. |
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| 1-1/2" Diameter, 28 Spline Camshaft - 5-1/2" Span - Offset | |||
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No slack adjusters of this brand are available in this size. |
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| 1-1/2" Diameter, 28 Spline Camshaft - 5-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065174 | $70.40 | |
| 1-1/2" Diameter, 28 Spline Camshaft - 6" Span | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065176 | $70.40 | |
| 1-5/8" Diameter, 37 Spline Camshaft - 5-1/2" Span - Fruehauf | |||
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No slack adjusters of this brand are available in this size. |
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| 1-5/8" Diameter, 37 Spline Camshaft - 6" Span - Fruehauf | |||
| Manufacturer | Part Number | Price | |
| Bendix | 060-065177 | $70.40 | |