Check Ring Gear/Drive Pinion Contact Pattern - AR35.30-P-0475-02F

Model 460 

Model 461 (except 461. 331) 

Model 463 (except 463.270/271) 

Number	Designation	Order number
BR00.45-Z-1002-07A	Engineer's blue, 80 ml tube, BLUE, Diamant	Qualitutswerkzeuge Hoffmann GmbH Haberlandstrasse 55 81241 Munich Germany

Check contact pattern 

1. Coat two teeth of ring gear (offset by 180°) with blue ink.
2. Turn the drive pinion forwards and backwards while braking the ring gear with the retainer .

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3. Compare contact pattern with contact pattern examples shown below and take specified remedial action if necessary.

   An ideal contact pattern is rarely obtained in practice. It is, however, important to ensure that the contact pattern on the tooth face does not extend to the outside edge of the tooth at any point.

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Unacceptable contact patterns 

Cause: Installation distance (basic dimension) of drive pinion too small. 

Remedy: Slightly increase installation distance (basic dimension) of drive pinion and repeat test of gear backlash, if necessary set gear backlash again. 

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Cause: Installation distance (basic dimension) of drive pinion too large. 

Remedy: Slightly reduce installation distance (basic dimension) of drive pinion and repeat test of gear backlash, if necessary set gear backlash again. 

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Cause: Gear backlash too large. 

Remedy: Set gear backlash and repeat gear backlash test. 

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Cause: Gear backlash too small. 

Remedy: Set gear backlash and repeat gear backlash test. 

Courtesy of MERCEDES-BENZ USA