SPECIFICATIONS
Model
SD20
SD50
SD50-4T
Reduction Gear System
Constant mesh
gear with dog
clutch
Cone clutch
Direction Of Rotation
Input Shaft
Counterclockwise viewed from stern
Propeller Shaft
Counter-clock-
wise viewed from
stern
Counter-clockwise or clockwise
viewed from stern
Reduction Ratio
Ahead
2.64
2.32
Astern
2.64
2.32
Propeller Speed (rpm)
1364
1293
1337
Lubrication System
Oil bath type
Lubricating Oil
Capacity
Standard Unit
2.2 L (2.3 qt)
2.2 L (2.3 qt), SD40: 1.8L (1.9 qt)
Long-Reach Unit
2.5 L (2.4 qt)
2.35 L (Extension 58) [2.5 qt], 2.45 L
(Extension 100) [2.6 qt]
Dry Weight
30 kg (66 lb)
39 kg (86 lb)
41 kg (90 lb)
Remote-Control
Device
Control Head
Single control lever
Cable
MORSE 33C (equivalent)
Applicable Engine Model (Maximum Rated Out-
put Power At Crankshaft)
1GM10C:
6.7 kW (9.1 hp) /
3600 rpm
2YM15:
10.3 kW (14 hp) /
3600 rpm
3YM20:
16.2 kW (22 hp) /
3600 rpm
3YM30:
22.1 kW (30 hp) /
3600 rpm
3JH4CE:
28.7 kW (39 hp) /
3000 rpm
4JH4ACE
39.6 kW (53 hp) /
3000 rpm
3JH5CE:
28.7 kW (39 hp) /
3000 rpm
4JH5CE:
39.6 kW (53 hp) /
3000 rpm
4JH4-TCE:
55.2 kW (75 hp) /
3200 rpm
Note: A propeller with rubber bushing must
be used in all SD series Sail-Drives.
Note: 1 hp metric = 0.7355 kW
SD Operation Manual
53
© 2009 Yanmar Marine International