Checking friction torque of tapered roller bearings · ar3530b047004xa · Mercedes-Benz WIS

AR35.30-B-0470-04XA

Checking friction torque of tapered roller bearings

Rear axle

772.111 in model 979

Values that evidence the difference, friction moment

Number	Designation			Rear axle 772.111
BE35.31-B-1001-02B	Pinion bearings friction torque	New bearing	Nm	5,8...23
		Used bearing	Nm	-

Values that evidence the difference, friction moment

Number	Designation			Rear axle 772.111
BE35.31-B-1002-02B	Spacing rings thickness	Available	mm	-
		Recommended (for the initial assembling)	mm	-

 Pinion

Number	Designation		Rear axle 772.111
BA35.30-B-1001-06D	Mounting nut of pinion coupling flange	Nm	1000...1245

Checking friction torque of tapered roller bearings

1	Rest the pinion on the press base, apply the specified force on it, and spin the hub several times in both directions.

2	Wind a rope around the pinion housing with a dynamometer fastened to the end of the rope. .

3	Confirm the force specified for the press and pull the dynamometer horizontally and, disregarding the initial pull, observe the value indicated on the dynamometer scale.

 The bearings must be lubricated and without the sealing rings.

B35.30-0028-01

4	If the friction torque is not within specifications, increase or reduce the thickness of the shims. .

 Alternative method
If no press is available, mount the pinion flange or fork without the sealing ring and tighten the nut to the specified torque. Then fix the assembly in a vise and measure the friction torque of the bearings with a spring scale. . 

B35.30-0029-01