Description
HD Value HDV9978 rolling-lobe air spring for Hendrickson trailer air-ride suspensions. Direct-fit replacement for Firestone W01-358-9978, Goodyear 1R12-668, and Hendrickson S-28929 / C-28929 — the air spring used across most Hendrickson dry van, refrigerated, flatbed, and heavy-haul trailer suspensions. HD Value parts are aftermarket, manufactured to meet OEM dimensional and load-rating specs.
Signs You Need a New Air Spring
- Trailer sags or sits unevenly when loaded
- Visible cracks, dry-rot, or weather-checking on the bellows
- Air leak audible at the top or bottom plate
- Excessive trailer bounce or hop when empty
- Uneven tire wear from suspension imbalance
Specifications
| Manufacturer | HD Value |
|---|---|
| Part Number | HDV9978 |
| Part Type | Trailer Air Spring (Rolling Lobe) |
| Extended Height | 18.00 in (19.60 in max) |
| Design Height | 11.50 in |
| Compressed Height | 7.80 in |
| Maximum Diameter | 12.60 in |
| Top Plate Diameter | 9.00 in |
| Top Plate Holes | 2 (5.50 in C-to-C) |
| Piston Diameter | 10.16-10.25 in |
| Weight | 15.10 lb |
Cross References
This part replaces or is equivalent to the following part numbers:
- Firestone: W01-358-9978, 9978, 8465, 1T15M-4
- Goodyear: 1R12-668, 1R12-1179
- Hendrickson: S-28929, C-28929, S-29928, C-29928
- Mack: 8446-S28929
- ContiTech: 67588, 67589, 69744
- Meritor: FS9978, MAF9978
- World American: WA01-9978C
Applications
This air spring fits the following suspensions:
- Hendrickson trailer air-ride suspensions using the S-28929 / W01-358-9978 spec
Representative trailers using this air spring:
- Dry van trailers (Wabash, Great Dane, Utility, Stoughton, Hyundai Translead, Vanguard) on Hendrickson air-ride
- Refrigerated trailers (Utility, Great Dane, Wabash) on Hendrickson air-ride
- Flatbed and heavy-haul trailers on Hendrickson trailer suspensions
Verify your suspension model and configuration against the cross-reference list before ordering — Hendrickson uses several similar air-spring SKUs.
