Leaf Spring Replacement (Single Axle)

Leaf Spring Replacement (Single Axle)

Removal Procedure




1. Set the parking brake.
2. Block the front wheels.
3. Raise the vehicle frame using a suitable lifting device in order to remove the weight of the vehicle from the spring assembly.
Support the frame forward of the rear axle.
4. Remove the rear dual wheel assembly, if necessary. Refer to Tire and Wheel Removal and Installation (Disc Type - Single) Tire and Wheel Removal and Installation (Disc Type - Single)Tire and Wheel Removal and Installation (Disc Type - Dual) Tire and Wheel Removal and Installation (Disc Type - Dual)Tire and Wheel Removal and Installation (Cast Type - Single) Tire and Wheel Removal and Installation (Cast Type - Single)Tire and Wheel Removal and Installation (Cast Type - Dual) Tire and Wheel Removal and Installation (Cast Type - Dual).
5. Remove the following components:

* The rebound nut
* The washer
* The bolt

6. Remove the shock absorber. Refer to Shock Absorber Replacement Shock Absorber Replacement.
7. Remove the U-bolt nuts and washers.
8. Remove the following components:

* The U-bolt anchor plate
* The shock absorber bracket

9. Remove the U-bolts.
10. Remove the seat
11. Lower the axle slightly.
12. Remove the following components:

* The eye bolt nut
* The washer
* The eye bolt

13. Support and raise the vehicle using a suitable lifting device in order to provide clearance between the spring assembly and the hanger bracket.
Support the frame forward of the rear axle.
14. Remove the following components:

* The auxiliary spring bolt
* The spacer
* U-bolt spacer

15. Remove the spring assembly using a suitable hoist.

Installation Procedure




1. Install the spring assembly onto the axle pad or axle stabilizer/spring seat, if equipped, using a suitable hoist.
2. Install the following components:

* The auxiliary spring
* The U-bolt spacer
* The spacers
* The bolt

3. Install the U-bolt spacer over the center bolt.
4. Install the U-bolts into the spacer grooves.
5. Install the U-bolt anchor plate (1) and seat.
6. Install the shock absorber bracket or stabilizer shaft/spring seat, if equipped.

Notice: Refer to Fastener Notice in Cautions and Notices.

Important: In order to properly tighten the U-bolt nuts, torque the nuts progressively as outlined below.


7. On 15,000 lb axles, install the 20 mm U-bolt nuts (2) and the washers.

1. Tighten the U-bolt nuts to 100 Nm (74 lb ft) in sequence.
2. Tighten the U-bolt nuts to 250 Nm (184 lb ft) in sequence.
3. Tighten the U-bolt nuts to 388 Nm (287 lb ft) in sequence.

8. On 19,000-26,000 lb axles, install the 20 mm U-bolt nuts (2) and the washers.

1. Tighten the U-bolt nuts to 150 Nm (111 lb ft) in sequence.
2. Tighten the U-bolt nuts to 275 Nm (203 lb ft) in sequence.
3. Tighten the U-bolt nuts to 437 Nm (344 lb ft) in sequence.

9. Install the following components:

* The spring eye bolt nut
* The washer
* The eye bolt

Tighten the spring front eye bolt to 415 Nm (305 lb ft).

10. Install the shock absorber. Refer to Shock Absorber Replacement Shock Absorber Replacement.

Tighten the lower shock absorber nut to 61 Nm (45 lb ft).

11. Lower the frame until the hangers touch the surface of the spring eye.




12. For tapered leaf springs, install the following components:

* The rear spring hanger rebound bolt

Tighten the bolt to 415 Nm (305 lb ft).

* The washer
* The nut

13. For multileaf springs, install the rear spring hanger bolt.

Tighten the bolt. Ensure that a minimum of 84.07 mm (3.36 in) is between the ears (1) of the rear spring hanger.