Westerbeke WPDS-20 Technical Manual page 67

8.2
TYPE SA1 MANUAL
Description
The Westerbeke-Paragon manua Ily operated re-
verse gear unitsconsistofa multipledisc clutch
and a planetary reverse gear train. These units
are self contained and are independent of the
engine lubrication system.
Operation
On the forward drive, the reverse gear case and
multiple disc clutch are locked together as a
solid coupling. The multiple disc clutch is
locked or clamped by the pressure produced
when the shift lever is moved to the forward
position. Thus the propeller shaft turns in the
same direction as the engine.
The reverse drive is obtained by clamping the
reverse bandaroundthe reverse
gearca~e
which
contains the planetary reverse gear train. The
reverse band is clamped when the shift lever is
moved to the reverse position. The reverse mot-
ion is then obtai ned by driving through the
gears thus turning the propeller shaft opposite
to the engine rotation.
With the shift lever in the neutral position the
multiple disc clutch and the reverse band are
unc lamped and the planet gears run idle and
the prope Iler shaft remains stationary.
It is desi rab Ie to start the engi ne wi th the trans-
mission in neutral, thus avoiding moving the
boat in either direction. It is recommended
that the shifting be done at speeds be low 1000
RPM and preferably in the 800 RPM range or
lower to prolong the life of the engine, trans-
mission and of the boat.
Lubrication
It is recommended that SAE 30 oi I be used for
lubrication. The quantity of oi I depends upon
the ang Ie of i nsta lIati on as we II as the reduct-
ion model. The level should
be
maintained at
the highmarkonthedipstick. The level should
be
checked periodically to ensure proper oper-
ation.
The number of hours that can be run between
oi I changes varies with the operati ng con-
ditions. Under normal conditions, the oil
should be changed every 100 hours or each
season, whichever is shorter.
Mode I and Seria I Numbers and Part Numbers
The mode I numbers and seria I numbers are on
the name plate on the cover of the transmission.
The parts lists accompanying the exploded views
areintendedonlyto identify the parts in regards
to disassembly and assembly and are not intend-
ed to be used to identify parts by number. To
order parts, refer to the part numbers and names
as gi ven in the above mentioned parts lists.
TROUBLE-S HOOT! N G
The accompanying 'trouble-shooting' charts
shou Id be studied and the suggestions carried
out prior to any disassembly to determine as
bestaspossible what the trouble may be. Also,
the exploded views and the accompanying dis-
cussions should be carefully read and under-
stood so that any or a II of the service work as
indicated from the trouble-shooting c harts may
be carried out properly.
DISASSEMBLY OF TRANSMISSION
As in any servicing operation, clean liness is a
must and a II rules for good workmanship apply.
Some of these rules are as follows:
1. Use only clean fluid
In
any cleaning or
washing of parts.
2. Use only clean oil for lubrication when
pressing parts together
3. Never use a hammer to drive ball bearings
in place.