Westerbeke WPDS-20 Technical Manual page 91

S.26
Fig. 2. Cross-section of reduction-reverse gear, ratio 1.9 : 1
sure is applied ta the shaft journal for the
bearing (35). Take care to ensure that the
needle bearing (35) is not damaged. Pro-
tect the bearing from dirt and place it so
that it will take up the same position again
when being fitted.
12. Drive out the shaft (40) wi th the gear whee I
(37) and the bearing (36). With regard to
taking care of
the
bearings, see point 11.
13. See Fig. 2. Removal of flange (44) and
bearing (3) from the shaft (42) should be
done in a press after the locking flange has
been removed. Pressure must not
be
applied
to the outer ci rcumference of the flange
(44) .
INSPECTION
Before the reverse gear is refitted, all its com-
ponents shou Id be carefully cleaned. At the same
time inspect the parts and replace those that are
worn. Fit new gaskets, O-ring and spring wash-
ers. Check carefully to see that all sealing
ring~
are undamaged.
See Fig. 2. Friction lining wear on the gear
wheel (31), which is most subjected to wear, is
compensated for by increasing the thickness of
the shim (21) as follows: Place the cone (28)
in the gear wheel (31) and measure the distance
"X" shown in Fig.4 The amount by which the
measurement "X" is less than 85mm (3.35") de-
termines how much the thickness of the shim (21)
shall be increased. For example, if the distance
measures 83mm (3. 29"), then a 2mm (0.08") thick
shim should be fitted.
If
the wearis so great that
the measurement
"X"
is less than 81mm (3.19"),
then the worn parts must be replaced. The fri ct-
ion linings in the gear wheel and cone are not
interchangeable.