33.15
Checking contact pattern
•
The contact pattern must be checked when the
set of gears, the housing or the bearing of the
drive bevel gear has been replaced.
L Note:
The contact pattern is set with the spacer ring?(1) on
the drive bevel gear.
•
Remove grease from the tooth profiles of the
crown wheel and bevel gear and coat with engi-
neer’s blue or white oil paint.
•
Fit crown wheel, press into housing with palm of
hand and turn forward and backward several
times.
•
If the correct spacer ring is installed, the no-load
contact pattern as shown above should be ob-
tained.
L Note:
The contact pattern is in the centre of the forward
profile “V”.
The contact pattern is nearer the large diameter on
the reverse profile “R”.
e Caution:
The teeth should never touch at the small diameter!
•
If this contact pattern is obtained, a thinner spac-
er ring must be installed.
•
If this contact pattern is obtained, a thicker spac-
er ring must be installed.
LT330220
1
LT330220
R
V
LT330240
LT330250
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