Note: The two components of the gear set (input bevel gear and crown wheel) must have matching numbers (1).
Measure dimension K at the input bevel pinion, taking into account the deviation (2) with sign as stated on the crown wheel from the basic dimension of 77.50 mm (3.0511 in):
e.g.: K = 77.50 mm + 0.20 mm = 77.70 mm (3.0512 in + 0.0079 in = 3.059 in)
Measure housing dimension G:
If G deviates from the housing basic dimension of 75.50 mm (2.972 in) the two places after the decimal point are stated on the housing neck:
e.g.: G = 75.45 mm (2.9705 in)
Calculate required thickness of spacer D:
D = K - G
e.g.: D = 77.70 mm - 75.45 mm = 2.25 mm (3.059 in - 2.9705 in = 0.0886 in)
Note: If there is no deviation marked on the crown wheel and no size on the housing the sizes are in compliance with the basic sizes, which means that the required spacer thickness is 2 mm (77.5 mm-75.5 mm)/0.0788 in (3.0512 in - 2.9725 in).