Pinion Flange: Service and Repair

COMPANION FLANGE REAR REMOVAL / INSTALLATION

Removal

CAUTION:The color on the rear face of the drive pinion nut is critical to this repair. Use the same color new drive pinion nut for installation. If a new collapsible spacer is installed, install the nut in the kit or damage to the component may occur.
NOTE:The rear wheels and brake drums must be removed to prevent brake drag during drive pinion bearing preload adjustment.
1. Remove the brake drums. See Service and Repair.

2. Mark the propeller shaft flange and rear axle companion flange for correct alignment during installation.






3. Remove the four propeller shaft bolts and disconnect the propeller shaft. Wire the propeller shaft out of the way.

4.

CAUTION:The propeller shaft centering socket yoke fits tightly on the rear axle companion flange pilot. Never hammer on the propeller shaft or any of its components to disconnect the yoke from the flange. Pry only in the area shown with a suitable tool to disconnect the yoke from the flange.Using a suitable tool, disconnect the propeller shaft centering socket yoke from the rear axle companion flange.

- Position the propeller shaft aside.






5. Install a N-m torque wrench on the pinion nut and record the torque required to maintain rotation of the pinion through several revolutions.






NOTE:After removal of the pinion nut, discard it. A new nut must be used for installation.

6. Use coupling holder to hold the rear axle companion flange while removing the pinion nut.






7. Mark the companion flange in relation to the drive pinion stem to ensure proper alignment during installation.






8. Use a 2-jaw puller to remove the companion flange.

Installation

1. Lubricate the companion flange splines with lubricant.
NOTE:Disregard the scribe marks if a new companion flange is being installed.

2. Align the companion flange with the drive pinion shaft.

3. With the drive pinion in place in the rear axle housing, install the companion flange using Companion Flange Replacer SST 205-002 (Tool 4858-E) or equivalent.

4. Position the new pinion nut.

CAUTION:Under no circumstances is the pinion nut to be backed off to reduce preloads. If reduced preload is required, a new collapsible spacer and pinion nut must be installed.






5. Using coupling holder SST 205-126 to hold the companion flange, tighten the pinion nut.
a. Rotate the pinion occasionally to make sure the cone and roller bearings are seating properly.

b. Install a N-m torque wrench on the pinion nut.

c. Rotating the pinion through several revolutions, take frequent cone and roller bearing torque preload readings until the original recorded preload readings are obtained.

d. If the original recorded preload is lower than specifications for used bearings, tighten to the appropriate specification. If the preload is higher than the specification, then tighten the nut to the original reading as recorded.

e. If additional adjustments are necessary, see Specifications.

6. Position the rear propeller shaft and align the marks on the rear axle companion flange.

7.

CAUTION:The propeller shaft centering socket yoke fits tightly on the rear axle companion flange pilot. Never hammer on the propeller shaft or any of its components to disconnect the yoke from the flange. Pry only in the area shown with a suitable tool to disconnect the yoke from the flange.

CAUTION:If new bolts to retain the propeller shaft to the axle are not available, coat the threads of the original bolts with thread-lock.
Install the four propeller shaft to rear axle companion flange bolts.






8. Install the rear brake drums. See Service and Repair.