Chalmers — 800 Series
Description
The Chalmers 800 Series suspension is a walking beam-style tandem axle rear suspension that uses two large elastomeric load springs and eight large torque rods, 4 upper and 4 lower. This design allows for a large degree of articulation so the load is equalized while keeping the tires in contact with the ground.
Fast Facts
| Chalmers — 800 Series | |
|---|---|
| Type | Walking beam-style tandem axle rear suspension |
| Features | Uses two large elastomeric load springs and eight large torque rods, 4 upper and 4 lower. |
| Problem Areas | Rubber load springs and torque rod bushings. Rubber load springs, subject to chemical attack will take a compression set over time. |
| ATRO Solutions | ATRO 2-piece torque rod bushings. ATRO load springs. |
Tech Tips and Additional Resources
ATRO’s 2-piece torque rod bushings make installation easier and faster. With limited installation clearance, 2-piece bushings are placed on each dowel pin on opposite sides and ends. Then the rod with the other halves loaded are positioned on the dowels. Finish the repair by placing and tightening the spigot cap.
Change one rod at a time! Otherwise, axles will slide and make re-installation of rods very difficult.
ATRO load springs provide key benefits over rubber
- Resistant to chemicals (lime, corrosive solvents, road wash)
- Better load handling and ride characteristics than OE rubber and other polyurethane brands
- Will not take a permanent compression set like rubber springs, keeping ride height accurate and driveline angles in spec
ATRO torque rod bushing options:
- 2-piece design – 32/suspension (PL1046, PL1047); oversized option is PL1049
- 1-piece design – 16/suspension (TH19-22010, TH19-22128); oversized option in TH19-22129
| Part Number | OE Part Number | Axle Rating |
|---|---|---|
| LP19-24002 | OE #15002 | 20,000 lbs |
| LP19-24015 | OE #15015 | 15,000 lbs |
| LP19-24026 | OE #15026 | 26,000 lbs |
| Bolt Size | Assembly Torque Ft. Lbs. |
|---|---|
| 3/8" | 35 |
| 1/2" | 65 |
| 5/8" | 135 |
| 3/4" | 250-280* |
Wear Items
- Rubber load springs, subject to chemical attack will take a compression set over time. This negatively affects the vehicle’s ride height, which puts the angle of the driveline out of OE specs, resulting in other problems including U-joint and carrier bearing failures.
- Torque rod bushings
Key Parts
Details
Restrictor Can and Load Spring
Photo showing typical assembly of Restrictor Can, Load Spring, beam and lower rods.
Spigot Connection
With tight clearance and dowel positioning, ATRO's 2-Piece bushing simplifies installation.
Load Spring Maintenance
Load Spring Maintenance
Load springs are subject to chemical attack and need to be replaced when worn. Otherwise, the ride height will be affected, causing numerous issues.
All Products