Radius Arm: Service and Repair

Radius Arm - F-450, F-550

NOTE: LH shown, RH similar.











NOTICE: Suspension fasteners are critical parts because they affect performance of vital components and systems and their failure can result in major service expense. They must be replaced with the same part number or an equivalent part if replacement is necessary. Do not use a replacement part of lesser quality or substitute design. Torque values must be used as specified during reassembly to make sure of correct retention of these parts.

1. Remove the shock absorber. For additional information, refer to Shock Absorber - F-450, F-550 Front Suspension.

2. NOTICE: Tighten the radius arm front nuts with the suspension at curb height or damage to the bushings may occur.

Remove and discard the 2 radius arm front nuts and bolts.

- To install, tighten the new nuts to 300 Nm (222 lb-ft).

3. Remove the wheel speed sensor harness bolt.
- To install, tighten to 15 Nm (133 lb-in).

4. NOTICE: Tighten the radius arm rear nut with the suspension at curb height or damage to the bushing may occur.

Remove and discard the radius arm rear nut and bolt.

- To install, tighten the new nut to 300 Nm (222 lb-ft).

5. Remove the radius arm.

6. To install, reverse the removal procedure.