Westerbeke WPDS-20 Technical Manual page 87

S.22
SAO Reverse
Adjustment
(Top View)
Replace the cover on the reverse gearhousing.
The transmission is ready for a preliminary test
which may be done at dockside,
Check all of the mooring I ines before continu-
ing the test,
With the engine running at i.dle speed, shift
the transmission into forward and reverse not-
ing how well the transmission responds.
If the transmission does not engage in one or
both of the forward or reverse positions further
dockside adjustments are necessary. Continue
the adjustments
CIS
outlined above untit the
transmission will engCGe in both forward and
reverse dri ves.
A complete running test is necessary to deter-
mine that the transmission is properly adjusted.
The transmission should not sl ip or IIbreak
II
away under full power conditions in the forward
drive and should hold in reverse under all nor-
mal reversing conditions.
If further adjustments are necessary, continue
the adjustments
CIS
outlined above until satis-
factory operation is reached. It should be
noted however that the adjustments should be
carried out only unti I satisfactory operation is
reached since it is possible to over-adjust the
transmission. If the transmission is over-ad-
justed it will be more difficult to shift into
forward and reverse and the parts wi II be heav-
ily stressed and subject to early fatigue fail-
ure. Therefore, once the preliminary adjust-
ments have been made, only a very small am-
ount of adjustment will be necessary for either
forward or reverse. Usually, an adjustment of
a half a step on the forward, or at the most, a
full step is required for full adjustment. Only
a very small adjustment is required for the re-
verse drive.
On the forward drive, a full step of adjustment
is as outlined above or is made by loosening
the lockscrew (42) and rotating the screw
coli ar (37) to the right unti I the next hole in
the pressure plate (35) can be lined up under
the lockscrew. A half a step is made by tak-
ing the lockscrew out of the hole that it is in
and pi acing it in the hole adjoining it in the
screw coil ar. Then rotate the screw coil ar to
the right unti I the next hole in the pressure
plate is lined up under the dog of the lock-
screw. Make certain that the lockscrew enters
the hole properly or it will bind up the forward
clutch.
When the transmission is properly adjusted,
replace the cover and secure all external bolts
and fasteners. Before replacing the shifting
linkage, check to make certain that it oper-
ates free I y ol'ld ooes not bind or drag. Replace
the I inkage on the transmission sh ift lever and
secure properly.
WHEN CLUTCH SLIPPING IS NOTICED, STOP AND ADJUST AT ONCE.
pqOPER ADJUSTMENT WILL MAINTAIN YOUR CLUTCH FOR YEARS,
BUT A SLIPPING CLUTCH MAY DESTROY ITSELF, CAUSING COSTLY
REPAIRS.