Rockwell Automatic Slack Adjusters
Important Rockwell Automatic Slack Adjuster Information
Rockwell Type 3 Unhanded Auto Slack
Rockwell / Meritor automatic slack adjusters (ASAs) should not need to be manually adjusted in service. ASAs should not have to be adjusted to correct excessive push rod stroke. The excessive stroke may be an indication that a problem exists with the foundation brake, ASA, brake actuator or other system components.
In the event that a manual adjustment must be made (although not a common practice), a service appointment and full foundation brake, ASA, and other system component inspection should be conducted as soon as possible to ensure integrity of the overall air brake system.
Never mix automatic slack adjusters on the same axle. Always use replacement parts that were originally designed for the brake system to help ensure maximum brake performance.
How a Rockwell Automatic Slack Adjuster Works
During installation of a Rockwell / Meritor stroke sensing automatic slack adjuster, you set the brake chamber stroke measurement, which is the correct shoe-to-drum clearance. When linings wear, this clearance increases, and the air brake chamber push rod must travel farther to apply the brakes.
When this happens, the slack adjuster will automatically adjust during the return stroke to maintain the correct shoe-to-drum clearance. If the air brake chamber push rod stroke is within limits during operation, no adjustment occurs.
Handed and Unhanded Rockwell Slack Adjusters
There are two Rockwell automatic slack adjuster designs: handed and unhanded. Handing refers only to the location of the pawl, which is used for clearance issues on the vehicle. For most applications, install a handed automatic slack adjuster so that the pawl faces INBOARD on the vehicle.
Unless otherwise noted, the slack adjusters listed below are of the Type 3 Unhanded variety.
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 | |
| Rockwell | 650-R801001 | $82.85 | |
| 1-1/4" Diameter, 24 Spline Camshaft - 5-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801003 | $81.80 | |
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802656 | $99.75 | |
| Note: Type 1 Handed Slack Adjuster | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802657 | $99.75 | |
| Note: Type 2 Handed Slack Adjuster | |||
| 1-1/2" Diameter, 10 Spline Camshaft - 5-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801041 | $75.50 | |
| 1-1/2" Diameter, 10 Spline Camshaft - 6" Span | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801042 | $75.50 | |
| 1-1/2" Diameter, 10 Spline Camshaft - 6-1/2" Span | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801048 | $82.85 | |
| Note: Type 1 Handed Slack Adjuster | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802361 | $82.85 | |
| Note: Type 2 Handed Slack Adjuster | |||
| 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 | |
| Rockwell | 650-R801073 | $75.50 | |
| Note: Type 3 Unhanded Slack Adjuster for drum brakes with type 24 and type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802446 | $91.65 | |
| Note: Type 1 Handed Slack Adjuster for drum brakes with type 24 and type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802447 | $91.65 | |
| Note: Type 2 Handed Slack Adjuster for drum brakes with type 24 and type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802462 | $82.85 | |
| Note: Type 2 Handed Slack Adjuster for disc brakes with type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802463 | $82.85 | |
| Note: Type 1 Handed Slack Adjuster for disc brakes with type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801070 | $82.85 | |
| Note: Type 3 Unhanded Slack Adjuster for brakes with type 16 brake chambers, 1/2" - 20 clevis thread | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801079 | $82.85 | |
| Note: Type 3 Unhanded Slack Adjuster for brakes with type 20 brake chambers, 5/8" - 18 clevis thread | |||
| 1-1/2" Diameter, 28 Spline Camshaft - 6" Span | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R801074 | $75.50 | |
| Note: Type 3 Unhanded Slack Adjuster for drum brakes with type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802486 | $82.85 | |
| Note: Type 1 Handed Slack Adjuster for drum brakes with type 30 brake chambers | |||
| Manufacturer | Part Number | Price | |
| Rockwell | 650-R802487 | $82.85 | |
| Note: Type 2 Handed Slack Adjuster for drum brakes with type 30 brake chambers | |||
| 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 | |
| Rockwell | 650-R801102 | $75.50 | |