Measuring and adjusting axial play of input shaft

AR27.50-S-0550-01EA

Measuring and adjusting axial play of input shaft

Topical note

General information on repair work on transmission

AH27.00-S-1000-01PS

Transmission

725.0 in model 447, 448

1

Place a  parallel gauge onto the  measuring tower (1).

2

Position digital vernier caliper (2) on top of  parallel gauge.

 Commercially available devices/tools
Digital vernier caliper

3

 Move to pulse ring (4) with measuring rod (10) and reset digital vernier caliper (2) to value of 0 mm.

4

 Place measuring sleeve (3) onto drive shaft.

5

Move measuring rod (10) to  sleeve (3) and determine dimension.

6

Calculate dimension L1 and note down.

 Determined dimension + 70 mm (fixed dimension of  measuring sleeve (3)) = Dimension L1
For example,  33.06 mm + 70.00 mm = 103.06 mm

7

 Remove measuring sleeve (3) from drive shaft.

8

Insert ring gear and planet carrier.

9

Place  test adapter (5) onto axial bearing of planet carrier.

10

Apply a force to the  test adapter (5) through the  fixture of 400 N.

11

Place a  parallel gauge onto the  measuring tower (1).

12

Position digital vernier caliper (2) onto  parallel gauge.

13

Move to the  test adapter (5) with the measuring rod (10) and reset the digital vernier caliper (2) to the value 0 mm.

14

 Move to pulse ring (4) with measuring rod (10), determine dimension and note down.

15

Calculate dimension L2 and note down.

 104 mm (fixed dimension of  test adapter (5)) - determined dimension = dimension L2
For example,  104.00 mm - 14.31 mm = 89.69 mm

16

Remove adjusting ring from planet carrier (7).

17

 Place measuring tower and  measuring sleeve (8) onto  parallel gauges.

18

Place planet carrier (7) onto  measuring sleeve (8).

19

Place a  parallel gauge onto the  measuring tower.

20

Position digital vernier caliper onto  parallel gauge.

21

Move with measuring rod (10) to inner race (6) and reset digital vernier caliper to value 0 mm.

22

Move measuring rod (10) to bearing washer (9), determine dimension L3 and note down.

23

Determine shim thickness.

 Dimension L1 - dimension L2 - dimension L3 - 0.10 mm = shim thickness
For example,  103.06 mm - 89.69 mm - 10.62 mm = 2.75 mm - 0.1 mm = 2.65 mm

24

Install shim of the determined thickness.