ar3530b047004e

Checking friction torque of tapered roller bearings

ประเภท ar · หัวข้อ 35.30 · เวอร์ชัน 0201 · 2020-07-08

ใช้กับ: Rear axle 743.451/458 in model 979.0 Rear axle 743.453/454 in model 979.27 Rear axle 743.480 in model 979.0

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ตำแหน่ง

กลุ่มฟังก์ชัน 2 Chassis › 35 Rear axle › 35.30 Final drive, drive shafts — ซีรีส์ 979 (รุ่น 0**, 27*)

EinPAS 17 Drivetrain/axle › 17.51 Rear axle › 17.51.65 Rear axle differential/axle through-drive — ซีรีส์ 979 (รุ่น 0**, 27*)

ใช้กับเครื่องยนต์/เกียร์ด้วย: 743 451, 743 453, 743 454, 743 458, 743 480

AR35.30-B-0470-04E

Checking friction torque of tapered roller bearings

Rear axle 743.451/ 453/ 454/ 458/ 480

Rear axle

743.451/458 in model 979.0

Rear axle

743.453/454 in model 979.27

Rear axle

743.480 in model 979.0

Test and adjustment values of the differential set

Number

Designation

Rear axle 743.451/453/454/458

Rear axle 743.480

BE35.30-B-1003-04B

Standard pinion measurement

mm

164,45...164,55

138,95...139,05

Test and adjustment values of the differential set

Number

Designation

Rear axle 743.451/453/454/458

Rear axle 743.480

BE35.30-B-1006-04B

Adjusting washer (friction moment)

mm

1,20...2,00

1,20...2,13

Test and adjustment values of the differential set

Number

Designation

Rear axle 743.451/453/454/458

Rear axle 743.480

BE35.30-B-1007-04B

Compensating washer (pinion's depth)

mm

0,1...0,5

0,1...0,5

Central actuation with differential

Number

Designation

Rear axle 743.451/453/454/458

Rear axle 743.480

BA35.30-B-1007-03A

Friction moment

Nm

5...13

4...10

Checking friction torque of tapered roller bearings

B35.30-0078-01

Checking friction torque of tapered roller bearings

1

Measure the height of ring gear side bearings (depth bearing) and of the flange-side bearing (friction bearing)


Measure the difference between the bearing heights, with and without cap.



Example of how to calculate the difference between dimensions A and B:
Measure A: bearing with cover = 32.121.
Measure B: bearing without cover = 28.950.
Measure E: (A) 32.121 - (B) 28.950 = 3.171 (E).
Example of how to calculate the difference between dimensions C and D:
Measure C: bearing with cover = 32.120.
Measure D: bearing without cover = 28.950.
Measure F: (C) 32.120 - (D) 28.950 = 3.170 (F).

B35.30-0079-01

Checking friction torque of tapered roller bearings

B35.30-0080-01

Checking friction torque of tapered roller bearings

2

Determine the friction shim of the pinion bearings, by adding the dimensions E + F + G + P


The pad of the basic pinion depth should have already been obtained when determining the pinion assembly dimension.



Measure P: Shim of the basic pinion depth, example: P = 0.950
Dimension G = Thickness of the housing support (1) for the pinion bearing caps, e.g., G = 23.992.
Total sum: (E) 3.170 + (F) 3.171 + (G) 23.992 + (P) 0.950 = 31.283
Subtract from this value the pinion spacer bushing value, e.g. H = 29.420.
Calculation: 31.283 - 29.420 (H) = 1.863 (Friction shim)

B35.30-0118-01

Checking friction torque of tapered roller bearings

After calculating the friction pad and after assembling the differential, measure the frictional torque. Adjust the torque wrench on the pinion, turn the key three times continuously. If the frictional torque is above specification, use a friction pad thicker than calculated. If the frictional torque is lower, use a thinner friction pad.
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B35.30-0077-01