Chalmers — 800 Series


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:

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

ATRO torque rods rebush or replace when bushing material is torn or cracked
Restrictor Can and Load Spring

Photo showing typical assembly of Restrictor Can, Load Spring, beam and lower rods.

ATRO torque rods rebush or replace when you find bushing walk-out
Spigot Connection

With tight clearance and dowel positioning, ATRO's 2-Piece bushing simplifies installation.

Load Spring Maintenance

ATRO torque rods measure center to center
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.

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