Pinion Bearing Preload (Friction Torque)

1. Install spacer sleeve (44) with bearing washers (48) on both sides on drive pinion
- Always replace spacer sleeve and bearing washers
2. Install drive pinion (47), bearings, seal and joint flange (41) to rear axle housing (50) as follows:





a. Position pinion shaft with bearings into case, then support drive pinion with removal and installation tool No. 140 589 10 43 00, or equivalent





b. Check thrust washer (arrow) of tapered roller bearing inner race for exact seating.





c. Install tapered roller bearing inner race (043d) in rear axle housing.
d. Coat new radial seal ring (42) on the sealing lip with suitable hypoid or universal hypoid fluid and mount on the alignment tool No. 140 589 08 15 00 (034), or equivalent
e. Press in tapered roller bearing inner race (43d) and radial seal ring (42) using puller tool No. 000 589 65 33 00 (035), or equivalent
f. Remove puller from rear axle housing with alignment tool and removal and installation tool.
g. Push joint flange (41) onto drive pinion
- Observe any match markings made at disassembly
- Coat contact surface for radial seal ring with suitable hypoid oil or universal hypoid fluid
3. Install hexagon collared nut to pinion shaft, but do not tighten at this time





4. Adjust friction torque of drive pinion bearing as follows:
a. Mount pin wrench (040) and 41 mm wrench socket (040a) on the joint flange (41) and carefully tighten the hexagon collared nut in steps until the specified friction torque of 225-250 Ncm is reached
b. During each tightening step of the the hexagon collared nut, turn the drive pinion several time and ensure by applying light blows to the rear axle housing that the tapered rollers are properly balanced in the track.





c. After each tightening step of the the hexagon collared nut, mount the torque meter tool No. 001 589 49 21 00 (040b) with connecting piece tool No. 100 589 02 59 00 (040c), or equivalents on the 41 mm wrench socket (040a) and rotate drive pinion at approx. 60 rpm, reading off the friction torque.
d. If the specified friction torque is exceeded. remove the drive pinion again and install a new spacer sleeve.