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.

Chalmers

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