Spur Gear Tapered Roller Bearing Pre-Load, Determining

Determine the New Adjusting Shim "S₅ "

This adjustment is necessary when replacing the following parts:

• Transmission cover
• Center differential housing
• Gear Carrier
• Output wheel/drive wheel
• Tapered roller bearing on the drive wheel/spur gear

Special tools and workshop equipment required 

• Measuring Set - Magnetic Plate - 50mm VW385/17 from Measuring Set VW385
• Dial Gauge Holder VW387
• Crown Wheel Adjusting Tool VW521
• Dial Gauge Extension from Dial Gauge Adapter 2066

• The outer race/tapered roller bearing for mounting drive wheel/spur gear is installed in the transmission cover.
• The outer race/tapered roller bearing-without shim-for mounting the drive wheel/spur gear is installed inside the gear carrier.

-- Install the drive wheel/spur gear in the transmission cover.

Install the gear carrier on the transmission cover as follows:

• Installation position: The tab -arrow A- on the gear carrier -1- must be installed in the opening -arrow B- in the transmission cover.

-- Next, mount the center differential housing -B- to the transmission cover using the bolts -A- and -arrows- (5 bolts).

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

-- Install the measuring tools.

-- Attach the Dial Gauge Holder VW387 to the hole in the transmission cover using a bolt -B- and nut.

-- Place the Dial Gauge Extension on the center of the Measuring Set - Gauge Block VW385/37.

-- Set the Dial Gauge (3 mm measuring range) to >>0<< with 2 mm pretension.

-A- Dial Gauge Extension from Dial Gauge Adapter 2066

-- Move the drive wheel/spur gear up and down using the Crown Wheel Adjusting Tool VW521.

-- Read the play off the dial gauge (e.g. 0.76 mm).

Example:

Measurement result (example)	0.76 mm
Preload (constant value)	+ 0.10 mm
Adjusting shim S5 thickness	= 0.86 mm

-- Shim thickness "S₅ " in this example is 0.86 mm.