Hendrickson — HN
Description
This walking beam suspension features bar pin end bushings with no center bushings for the beams to pivot on. The traditional center bushing is replaced by 2 large bolster springs (4 per vehicle.).
Hendrickson HN
Fast Facts
| Hendrickson — HN | |
|---|---|
| Type | Walking beam suspension with bar pin end bushings. |
| Features | |
| Problem Areas | No center bushings for the beams to pivot on. The transverse rod is critical, especially in high center of gravity applications like dump trucks, and concrete mixers. |
| ATRO Solutions | |
Tech Tips and Additional Resources
The proper number of shims for the auxiliary spring can vary according to application and unladen tandem weight. Refer to ATRO Technical Bulletin TB001-012418.
Wear Items
- The transverse rod is critical, especially in high center of gravity applications like dump trucks, concrete mixers. Check periodically for wear.
- Check bolsters for cracks/debonds
- Replace if material is cut 1" length or 3/8" in depth
- Replace if bond separation is >1/2" deep
- Auxiliary spring should be replaced if the spring itself measures less than 3 1/2" in height when the truck is unloaded.
Failure Analysis:
| Location | Possible Primary Failure Point |
|---|---|
| Debond at top plate | Check torque rods for bushing failure |
| Debond at lower plate | Check bar pin end bushing for failure |
Key Parts
Details
Hendrickson HN
Auxillary load spring, LP50-2400 Bolster Spring, "V" bracket, equalizing beam.