Description
Genuine Hendrickson OEM C-24488 SureLok air spring actuator — the small auxiliary air bag that operates the height-lock arm on Hendrickson SureLok trailer suspension systems. Locks trailer ride height during dock loading so the chassis cannot drop or rise as cargo weight changes, protecting the dock plate and the trailer body. Direct replacement for service numbers S-24488 and S-25593.
Signs You Need a New SureLok Actuator
- Trailer drops or rises at the dock while loading even with the air dump valve closed
- Height-lock arm will not extend when SureLok is engaged
- Audible air leak at the actuator body or 1/8″ NPT inlet fitting
- Cracked or torn actuator bag visible during inspection
Specifications
| Manufacturer | Hendrickson (OEM) |
|---|---|
| Part Number | C-24488 |
| Part Type | SureLok Air Spring / Height-Lock Actuator |
| Body Height | 6-1/2 in |
| Piston Diameter | 2-5/8 in |
| Locating Pin | 1/2 in diameter, 1/2 in height |
| Air Inlet | 1/8 in NPT |
| System | Hendrickson SureLok suspension height-lock |
Cross References
This SureLok actuator replaces or is equivalent to the following part numbers:
- Hendrickson: C-24488, C24488, C-25593, C25593, S-24488, S24488, S-25593, S25593
- Firestone: 5593
- Automann: ABSZ70-5593
- TORQUE: TR25593
- Universal Air / Truckspring: HT-S25593, HTS25593, HT263
- Also known as: SC26-WC12, 77550
Applications
This actuator fits Hendrickson SureLok trailer suspensions used in dock-loading service on:
- Dry van trailers, reefer trailers, and intermodal chassis equipped with Hendrickson SureLok height-lock
- Hendrickson HKA, HKAT, INTRAAX, and ZMD-equipped trailer suspensions where SureLok is a factory or dealer-installed option
Verify the SureLok kit version on your trailer before ordering — some dock-stabilization systems use a larger actuator. Confirm body height (6-1/2″), piston diameter (2-5/8″), and 1/8″ NPT inlet match the original.
