
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
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