Description
The OTR 22153CR is a curved-arm automatic slack adjuster for trailer air brake systems, supplied as a direct replacement for Stemco / Crewson MK22153S. 1.5 in × 28-spline shaft engagement, 5 in and 6 in arm lengths combined into one casting, automatic clearance adjustment with each brake apply. Crosses to Haldex 40010305 / CS52343 and Meritor R806006.
Signs You Need a New Slack Adjuster
- Brake stroke at the chamber exceeds CVSA limits during a stroke check
- Slack adjuster will not turn freely with the manual adjustment hex
- Audible internal clutch / pawl wear at the brake apply
- Brakes drag or fail to release fully after apply
- Visual cracks or impact damage at the arm or splined boss
Specifications
| Manufacturer | OTR |
|---|---|
| Part Number | 22153CR |
| Part Type | Automatic Slack Adjuster (Crewson-style) |
| Spline Size | 1.5 in — 28 spline |
| Arm Length | 5 in and 6 in (combined) |
| Arm Style | Curved |
| Adjustment | Automatic (clearance-sensing) |
| Application | Trailer air brake |
Cross References
This automatic slack adjuster replaces or is equivalent to the following part numbers:
- OTR: 22153CR
- Stemco / Crewson: MK22153S
- Haldex: 40010305, 40910157, CS52343
- Meritor: R806006
- Gunite: AS1149
- Midland: CS52343
- Also known as: E10949A, E10949B, SA22953, L3161
Applications
Curved-arm automatic slack adjuster for trailer S-cam air brake systems:
- Tandem and tri-axle dry van and reefer trailers with 1.5 in × 28-spline cams
- Flatbed, dump, and tank trailers using Crewson-style ASAs
- Replacement for trailers spec’d with Stemco / Crewson MK22153S
Verify spline size, arm length, and pull rod orientation against the existing slack adjuster before ordering. Always perform a brake stroke check after installation per FMCSA / CVSA procedure.
