STEP 1

Remove the Keeper From the Nut

When using Pro-Torq, use a screwdriver to carefully pry the keeper arm from the undercut groove on each side until the keeper is released.

STEP 2

Thread the Nut Onto the Axle

Thread the nut onto the axle until hand tight against the bearing.

STEP 3

Seat the Bearing

With wheel hub assembly:

1. Using a torque wrench: (A) Tighten the nut to 200 ft-lb. Spin the wheel hub assembly at least one full rotation.
(B) Tighten the nut to 200 ft-lb. Spin the wheel hub assembly at least one full rotation.
(C) Tighten the nut to 200 ft-lb. Spin the wheel hub assembly at least one full rotation.
2. Back the nut off one full rotation.

STEP 4

Adjust the Bearing

With wheel hub assembly:

1. Using a torque wrench: (A) Tighten the nut to 100 ft-lb. Spin the wheel hub assembly at least one full rotation.
(B) Tighten the nut to 100 ft-lb. Spin the wheel hub assembly at least one full rotation.
(C) Tighten the nut to 100 ft-lb. Spin the wheel hub assembly at least one full rotation.
2. Back the nut off one face mark (according to chart).

Final Back Off

STEP 5

Install the Keeper (Skip this step if using Zip-Torq)

Orange side facing out:

1. Insert the keeper tab into the undercut groove of the nut and engage the keyway tang in the axle keyway. Insert keeper tab with the orange side facing out.
2. Engage the mating teeth.
3. Compress and insert the keeper arms, one at a time, into the undercut groove with a screwdriver.

For Steering Spindle Nut:

448-4836, 448-4839, 448-4840, 448-4863, 448-4864, and 448-4865

1. Align the flat of the keeper with the milled flat on the spindle and insert the single keeper tab into the undercut groove of the nut. Insert keeper tab with the orange side facing out.
2. Engage the mating teeth.
3. Compress and insert the keeper arms, one at a time, into the undercut groove with a screwdriver

NOTE: Recommended practice is to replace the keeper each time the Pro-Torq nut assembly is removed for maintenance purposes.

STEP 6

Inspect the Installation

Failure to follow this instruction could cause the wheel to come off and cause bodily injury. When using Pro-Torq, make sure that the keeper tab and keeper arms are fully seated into the undercut groove. Inspect keyway tang to ensure it does not contact the bottom of the keyway. If contact exists, immediately notify a STEMCO representative. This procedure will consistently produce a bearing setting of 0.001" to 0.003" end play.

STEP 7

Acceptable End Play

The dial indicator should be attached to the spindle with its magnetic base. Adjust the dial indicator so that its plunger is against the end of the hub face with its line of action approximately parallel to the axis of the spindle. If spindle mounting is not possible, the dial indicator should be attached to the hub and aligned to indicate on the spindle. Grasp the wheel or hub assembly at the 3 o’clock and 9 o’clock positions. Push and pull the wheel end assembly in and out while oscillating the wheel approximately 45 degrees. Stop oscillating the hub so that the dial indicator tip is in the same position as it was before oscillation began. Read the bearing end play as the total indicator movement.

NOTE: Acceptable end play is 0.001"- 0.005".

For single-nut self-locking systems, consult manufacturers’ specifications. STEMCO assumes no responsibility for bearing warranty.