Description
The ContiTech AS8774 is a reversible-sleeve trailer air spring built for Hendrickson Intraax AAT 30K (and 25K) trailer suspensions. Direct replacement for Firestone W01-358-8774, Hendrickson S-25873/S-27341, and Goodyear 1R14-172. The 1T19LF-7 bellows is paired to a 10.10″ composite piston with an 11.31″ top plate for compatibility with platforms, tankers, dumps, grain hoppers, and specialty trailers running the AAT family.
Signs You Need a New Air Spring
- Visible cracks, dry rot, or chunking in the rubber bellows
- Trailer sitting low on one side or with uneven ride height
- Audible air leaks or hissing at the suspension
- Excessive bouncing, cargo shift, or harsh ride
- Bellows separated from the top plate or piston
Specifications
| Manufacturer | Continental ContiTech |
|---|---|
| Part Number | AS8774 |
| Part Type | Air Spring – Reversible Sleeve |
| Extended Height | 20.88 in |
| Compressed Height | 6.14 in |
| Top Plate Diameter | 11.31 in |
| Piston Diameter | 10.10 in |
| Top Plate Number | 3318 |
| Piston Number | 9594 |
| Piston Material | Composite |
| Firestone Bellows | 1T19LF-7 |
| ContiTech Bellows | 11 10.5F-17 |
Cross References
This air spring replaces or is equivalent to the following part numbers:
- Firestone: W01-358-8774, 8774
- Hendrickson: S-25873, S-27341, C-25873
- Goodyear: 1R14-172, 1R14-190
- ContiTech: 11 10.5F-17 P 745, 65593, 65796, 66647, 66706, 8745
- Watson & Chalin: AS-0159, AS-0159G, AS-0144
- Triangle: AS-8745, 8745
- Meritor: FS8774, MAF8774
- Automann: AB1DK28M-8774, 566.ER8774
- Dayton: 352-8774, 452-8774L
- World American: WA01-8774C
Applications
This reversible-sleeve air spring fits the following trailer suspensions:
- Hendrickson Intraax AAT 30K top-mount trailer suspensions
- Hendrickson Intraax AAT 25K trailer suspensions
- Hendrickson Intraax Extreme Duty 30K (AAEDT) suspensions
- Watson & Chalin trailer suspensions calling for AS-0159
Representative trailer types using these suspensions:
- Flatbed and drop-deck platform trailers
- Tank trailers and bulk haulers
- Dump trailers and grain hoppers
- Specialty and heavy-haul trailers
Verify OEM part number, mounting configuration, and ride-height before ordering. Air springs must be matched by dimensions and bracketry, not by trailer model alone.
