Description
HD Value HDV8709 is a rolling-lobe trailer air spring that replaces Firestone W01-358-8709 (1T17CA-5), Hendrickson S-21800 / S-20900 / C-21800, Goodyear 1R13-159, and ContiTech AS8709 on Hendrickson Intraax and Vantraax 23K trailer suspensions. Built for the AAT 23K platform, the bag carries 9,250 lb at 100 psi at a 10″ design height with a parallel two-bolt top and single-stud bottom mount.
Signs You Need a New Air Spring
- Trailer riding low, sagging on one side, or sitting unevenly across the axles
- Excessive bounce or harsh impacts at highway speed
- Trailer ABS / height-control system cycling more frequently to hold ride height
- Visible bellows cracking, dry rot, or audible leak from the air port
Specifications
| Manufacturer | HD Value |
|---|---|
| Part Number | HDV8709 |
| Part Type | Trailer Air Spring (Rolling Lobe) |
| Spring Type | Rolling Lobe |
| Design Height | 10.0″ |
| Maximum Height | 19.3″ |
| Minimum Height | 4.9″ |
| Maximum Diameter | 13.9″ |
| Top Plate Diameter | 10.2″ (2-bolt, 5.5″ CTC) |
| Bottom Plate Diameter | 9.17″ (1-bolt, 2.25″ CTC, parallel) |
| Load Rating @ 80 PSI | 7,400 lbs |
| Load Rating @ 100 PSI | 9,250 lbs |
| Suspension | Hendrickson Intraax / Vantraax AAT 23K |
Cross References
This trailer air spring replaces or is equivalent to the following part numbers:
- Hendrickson: S-21800, S-20900, C-21800
- Firestone: W01-358-8709, 8709, 8751, 1T17CA-5
- Goodyear: 1R13-159, 566-26-3-073
- ContiTech: AS8709
- Triangle: AS-8453, AS-8460
- Automann: AB1DK25A-8709, AB1DK25B-8751
- Sampa: SP558709-KP
Applications
This rolling-lobe air spring fits the following Hendrickson trailer suspensions:
- Hendrickson Intraax AAT 23K
- Hendrickson Vantraax AAT 23K
- Other Hendrickson trailer applications using the AAT 23K air-ride suspension
Replace trailer air springs in pairs to keep the suspension level. Verify your existing air spring number stamped on the bottom plate before ordering — Hendrickson uses several similar bags across the AAT family with different load ratings.
