Checking friction torque of tapered roller bearings

AR35.30-B-0470-04HE

Checking friction torque of tapered roller bearings

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

Rear axle

740.880/884 in model 963, 964

 Transmission to rear axle

Number

Designation

Rear axle 740.880/884

BA35.30-B-1001-02HD

Collar nut on rear axle flange

M55x1.5

Adjustment tightening torque

Nm

-

Final tightening torque

Nm

855

 Transmission to rear axle

Number

Designation

Rear axle 740.880/884

BA35.30-B-1011-02HD

Friction torque of the pinion tapered roller bearings

Nm

4 ... 12

1

Install the  holding tool on the drive flange.

2

Tighten the collar nut to the final tightening torque using the  socket wrench adapter and the  torque multiplier wrench.  

3

Position the  torque wrench (6) with the  socket wrench adapter (4) on the collar nut.

4

Spin the drive flange continuously by at least 3 turns.

 Do not start spinning the drive flange with a impact.

If the friction torque does not match the specified value:



Change the thickness of the spacer washer.  

5

Determine the proper spacer washer.

 In case of friction torque GREATER than the specified value: install a THINNER spacer washer .
In case of friction torque LOWER than the specified value: install a THICKER spacer washer.

 Consider the smaller specified value for re-used tapered roller bearings.
Consider the greater specified value for new tapered roller bearings.

6

Remove again the drive flange.

7

Remove again the pinion from the casing of the drive flange.

8

Install the proper spacer washer and the casing of the drive flange on the pinion.

9

Heat the tapered roller bearing up to approx. 80 °C and install it on the pinion, up to the stop.

10

Check again the friction torque .  