This adjustment is only necessary if the output flange is renewed. Its purpose is to reestablish the shaft bevel gear tapered roller bearing preloading.
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Measure length of old and new output flange shafts and determine difference.
Example:
Old output flange
42.90 mm
New output flange
43.00 mm
Difference
0.10 mm
If the new output flange is longer, install a shim which is thinner by the difference.
If the existing output flange is longer, install a shim which is thicker by the difference.