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
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. .
