Spur Gear Tapered Roller Bearing Pre-Load, Determining

Spur Gear Tapered Roller Bearing Pre-Load, Determining

Determine the new adjusting shim S5

This adjustment is required when the following components are replaced:

• Transmission cover

• Center differential housing

• End shield

• Spur gear

• Tapered roller bearing on the spur gear

Special tools, testers and auxiliary items required

• Magnetic Plate 50 mm Dia. (VW 385/17) from the Universal Measuring Tool (VW 385)

• Dial Gauge Holder (VW 387)

• Crown Wheel Adjustment Device (VW 521)

• Dial Gauge Extension from the Dial Gauge Adapter (2066)

• The outer race / tapered roller bearing for the gear wheel mounting is installed inside the transmission cover.

• The outer race / tapered roller bearing with adjusting shim for the gear wheel mounting is installed inside the gear carrier. A 0.85 mm adjusting shim S5* must be used (part number 012 409 387 ED) for measuring.

• For the initial measurement, an adjustment shim S5 with a thickness of 0.85 mm is inserted. It is designated as S5* in the following. After determining the bearing pre-load, S5* is replaced by final S5.

- Install the spur gear in the transmission cover.

Install the gear carrier on the transmission cover as follows:





• Installed position: the tab - arrow A - on the gear carrier must installed into the opening - arrow B - inside the transmission cover.

- Attach the center differential housing - C - to the transmission cover using the bolts - A -, - B - and - arrows - (quantity: 5).





• Not all versions have the double bolts - B -; allocation, refer to the electronic parts catalog ETKA.

- Then set the transmission cover with the attached center differential housing in vertical position making sure the center differential housing is facing downward.

- Install measuring tools.

- Attach the (VW 387) in the hole in the transmission cover using the screw - B - and nut.





- Place (VW 387) on center of (VW 385/37).

- Set dial gauge (3 mm measuring range) to 0 with 2 mm preload.

- A - (VW 387) from the (2066)

- Move the spur gear up and down using the (VW 521).

- Read play on dial gauge.

Example:

0.26 mm

Example:






• Allocate adjustment shims, refer to the electronic parts catalog ETKA.

- The thickness of the shim S5 in this example is 1.21 mm.