Checking friction torque of tapered roller bearings
Type ar · topic 35.30 · version 0101 · 2018-07-20
Applies to: Rear axle 746.96 in model 693.184/191/195, 695.043 Rear axle 746.962 in model 386.014 Rear axle 746.964 in model 693.144 Rear axle 746.966 in model 693.128, 695.014 Rear axle 772.100 in model 384 Rear axle 772.110 in model 695.302 Rear axle 772.112 in model 958 Rear axle 772.115 in model 958
Also applies to engines/gearboxes: 746 96*, 746 962, 746 964, 746 966, 772 100, 772 110, 772 112, 772 115
AR35.30-B-0470-04D
Checking friction torque of tapered roller bearings
Rear axle
746.96 in model 693.184/191/195, 695.043
Rear axle
746.962 in model 386.014
Rear axle
746.964 in model 693.144
Rear axle
746.966 in model 693.128, 695.014
Rear axle
772.100 in model 384
Rear axle
772.110 in model 695.302
Rear axle
772.112 in model 958
Rear axle
772.115 in model 958
Values that evidence the difference, friction moment
Number
Designation
Rear axle 772.110/115/116
Rear axle 772.112
BE35.31-B-1001-02B
Pinion bearings friction torque
New bearing
Nm
2,1...4,8
0,5...5,0
Used bearing
Nm
1,3...2,8
1,1...3,4
Values that evidence the difference, friction moment
Number
Designation
Rear axle 741.9, 742.8, 745.5/9, 746.5/8/9
BE35.31-B-1001-02C
Pinion bearings friction torque
Nm
1,4 ... 6,0
Values that evidence the difference, friction moment
Number
Designation
Rear axle 772.110/115/116
Rear axle 772.112
BE35.31-B-1002-02B
Spacing rings thickness
Available
mm
18,30...19,24
13,03...13,38
Recommended (for the initial assembling)
mm
18,79...18,90
13,18...13,28
Values that evidence the difference, friction moment
Number
Designation
Rear axle 741.9, 742.8, 745.5/9, 746.5/8/9
BE35.31-B-1002-02C
Thickness of split washers of the pinion bearings - 0.02 mm increments
minimum
mm
6,60
Maximum
mm
7,40
Pinion
Number
Designation
Rear axle 746.96
Rear axle 772.100
BA35.30-B-1001-06D
Mounting nut of pinion coupling flange
Nm
1250...1530
1000 ... 1250
Pinion
Number
Designation
Rear axle 772.112
Rear axle 772.110/115
BA35.30-B-1001-06D
Mounting nut of pinion coupling flange
Nm
1350...1670
1250...1530
The bearings must be greased and without ring seal
1
Rest the pinion gear on the press plate, apply the specified force on it, and spin the hub several times in both directions. .
2
Wind a rope around the pinion gear 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.
B35.30-0028-01
If there is not a press
Alternative method
4
Assemble the flange of the gear pinion fork without the ring seal, and tighten the nut with the specified tightening torque. .
5
Hold the assembly in a bench vice and measure the friction torque of the bearings with a spring dynamometer. Rear axle 772.100/110/112/115 Rear axles 746.96/962/964/966
If the friction torque do not correspond to the specification
Increase or diminish the thickness of the spacer rings. Rear axles 772.100/110/112/115
