Westerbeke WPDS-20 Technical Manual page 88

S.23
SA1 AND SAO REDUCTION UNITS
DESCRIPTION
The Westerbeke/Paragon reduction gears consist of an internal ring gear and a
drive gear that offers a variety of reduction ratios.
ADJUSTMENTS
There are no adjustments necessary to maintain the reduction gears in proper
running condition.
DISASSEMBLY OF REDUCTION UNIT
NOTE: Disassembly need be carried out only as far as necessary to correct
those difficulties which interfere with proper marine gear operation.
Remove reverse and reduction gear as a complete unit before removing the oi} to
avoid fouling the bilges.
1.
Remove oil drain plug from bottom of reduction gear housing (86) and
drain oil from unit. Make certain that all lubricating oil is removed
from reverse gear unit.
2. Remove caps crews and lockwashers from flange of reduction gear housing
and slide entire reduction unit straight back approximately 3 inches until
reduction unit clears reduction drive pinion.
3. Bend tang of lockwasher (78) away from locknut (77). Remove locknut
using suitable wrench and lift lockwasher from shaft.
4. Remove gear half coupling (75) with gear type puller or by supporting
entire assembly under flange of gear half coupling and press agamst shaft
to force coupling from assembly.
5. Support reduction gear housing so that flanged shaft assembly can drop
free approximately 2 inches and press flanged shaft assembly from
reduction gear housing.
6. Remove retaining ring (76) from groove next to ball bearing (84) in..;ide
reduction gear housing and press ball bearing from housing.
7.
If
necessary to replace, remove oil seal (79).
8. Remove Woodruff key (80) from flanged shaft and remove seal washer (74)
and spacer (73).
9. Press ball bearing (84) from flanged shaft using two holes in flange.
10. Remove capscrews and lockwashers from rim of flanged shaft and remove
ring gear (71) from flanged shaft.
INSPECTION
All parts should be thoroughly cleaned before inspection. Parts showing excessive
wear should be replaced.
1. Ball bearings should be examined for indications of corrosion and pitting
on balls and races.
2. All gear teeth should be examined for "pitch line pitting", uneven wear
pattern or excessive wear.
3. Examine oil seal for rough or charred lips.
4. Retaining rings should be checked for burrs or deformities.
5. All gaskets should be replaced.
ASSEMBLY OF REDUCTION UNIT
1. Replace oil drain plug into reduction gear housing (86).
2. Press ball bearing (84) into reduction gear housing (86) and install retain-
ing ring (76) into groove next to ball bearing.