Tools Required

1. Set the parking brake.
2. Block the vehicle rear wheels.
3. Raise the front of the vehicle until the tires clear the floor. Refer to Lifting and Jacking the Vehicle in General Information.
4. Support the frame using suitable safety stands.
5. Remove the wheels, the hubs, and the bearings. Refer to Front Wheel Hub, Bearing, and Seal Replacement .
6. Remove the brake components as needed. Refer to Brake Caliper Replacement in Disc Brakes.



7. Remove the tie rod arm bolts (9). Lower the tie rod arm (10) and the tie rod to the floor.
8. Remove the steering arm bolts (5). Support the steering arm (6) and the steering rod out of the way.
9. Remove the kingpin upper cap (1).
10. Remove the following components:

•	The bolts (17)

•	The washers (18)

•	The kingpin lower cap (15)

•	The gasket (14)

11. Remove the kingpin nut (2).



12. Using the J 39758 , insert the tool pins into the holes at the bottom of the kingpin.
13. Align the tools bolt holes.
14. Secure with two bolts into the steering knuckle in order to prevent the kingpin from spinning.



15. Remove the kingpin (12) by knocking out the pin with a soft-faced mallet.
16. Remove the steering knuckle (20).
17. Support the knuckle in a vise.
18. Remove the following components from the knuckle (20):

•	The seals (19)

•	The bearing (3)

•	The shim or spacer (4)

•	The bushing (13)

19. Remove the kingpin bushing (13), if required. Refer to King Pin Bushing and Bearing Cup Replacement .

1. Clean the axle components using a cleaning solvent.
2. Soak the thrust bearing until all of the old lubricant is gone.
3. Inspect the axle components for the following conditions:

•

Wear

•

Pitting

•

Cracks

•

Damage

4. Use Magna-Flux™ inspection, if available, in order to inspect the steering knuckles (20) and the kingpins (12) for minute cracks, checks, or fractures.
5. Inspect the kingpin bearings and the cups for rough rotation.
6. Inspect the bores in the axle kingpin (12) for the following conditions:

•

Scratches

•

Burrs

•

Corrosion

7. Inspect the bores in the kingpin bushing (13) for the following:

•

Scratches

•

Burrs

•

Corrosion

8. Smooth the bore using a crocus cloth or a fine grit sandpaper if needed. Clean the bore.

1. Install the kingpin bushings (13), if removed.
2. Install the kingpin bearing cup, if removed.
3. Install the steering knuckle (20).
4. Install the kingpin (12) and install the dust seals (19).
5. Install a shim or spacer (4).
6. Install the kingpin thrust bearing (3). Pack the bearing thoroughly with high temperature wheel bearing grease.
7. Install the kingpin nut (2).



8. Using the J 39758 insert the tool pins into the holes at the bottom of the king pin.
9. Align the tools bolt holes.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

10. Secure the tool with two bolts into the steering knuckle in order to keep the kingpin from spinning.

Tighten
Tighten the kingpin nut (2) to 550 N·m (406 lb ft).

11. Measure the kingpin bearing preload. Refer to King Pin Bearing Preload .



12. Install the following components:

•	The bottom gasket (14)

•	The dust cap (15)

•	The washers (18)

•	The bolts (17)

Tighten
Tighten the dust cap bolt to 24 N·m (18 lb ft).

13. Install the kingpin upper dust cap (1). Tap the dust cap into place using a soft-faced mallet. Grease the knuckle (20) through the lubrication fitting (16) on the bottom.
14. Install the tie rod arm (10).
15. Install the steering arm (6), if removed.
16. Install the brake backing plate and the dust cover.
17. Install the brake components as needed. Refer to Brake Caliper Replacement in Disc Brakes.
18. Install the wheel bearings, the hubs, and the wheels. Refer to Front Wheel Hub, Bearing, and Seal Replacement .
19. Remove the safety stands and lower the vehicle.
20. Check the axle alignment.
21. Check the stop screw (7, 8) adjustment. Adjust as needed. Refer to Stop Screw Adjustment in Wheel Alignment.