Measure And Adjust Axial Play Of Hollow Shaft Bearing - AR27.50-P-0650-03NKB

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Transmission 724.0 in model 117

Transmission 724.0 in model 118, 177, 247

Transmission 724.0 in model 156

Transmission 724.0 in model 176

Transmission 724.0 in model 242

Transmission 724.0 in model 246

Fig 1: Identifying Parallel Support (168 589 03 21 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1038-04A	Loctite 7200	A 010 989 90 71
BR00.45-Z-1046-04A	Loctite 7063 (400 ml) cleaning spray	A 001 986 71 71 09

The following special tool is required: parallel gauge (168 589 03 21 00).

A digital vernier caliper (01) is required to determine the retaining ring (adjusting ring).

Thoroughly clean contact surfaces on grooved ball bearing (44) and coupling housing (27K).
Check for absolute cleanliness.

Measurement errors occur otherwise. These will result in damage to the transmission.

Do not use any sharpedged tools or abrasive paper. Otherwise the face and contact surfaces will be damaged.

Courtesy of MERCEDES-BENZ USA
Place deep-groove ball bearing (44) of hollow shaft on parallel gauges (02).
Move the digital vernier caliper (01) to the zero position (x) from the storage area to the bearing groove on the grooved ball bearing (44).
Measure from the bearing surface on the grooved ball bearing (44) to the parallel gauge (02) and note down bearing value (A).

Measure at three positions and use the bearing values (A) to calculate the mean value, this is then required for further calculation.

Courtesy of MERCEDES-BENZ USA
Measure from the bearing seat in the coupling housing (27K) on the retaining ring (43) and move the digital vernier caliper (01) to the zero position (z).

During the measurement the retaining ring (43) must be held up using a suitable tool.
Measure from the bearing seat in the coupling housing (27K) to the oil line sleeve (42) and note down the distance value (B).

Measure at three positions and use the distance values (A) to calculate the mean value, this is then required for further calculation.
Calculate retaining ring size for adjustment of hollow shaft axial play:
Retaining ring size:

Distance value (B) in coupling housing

- Bearing value (A)

=Retaining ring size "S"

Example calculation:

16.76 mm (B)

- 14.92 mm (A)

= 1.84 mm

Retaining rings are available in sizes from 1.65 mm to 1.95 mm in increments of 0.05 mm. In the above calculation example a retaining ring of size 1.85 mm is installed.