Alternator Standard, 12V/60A; Specifications - Yanmar 3YM30 Sevice Manual

12.4 Alternator standard, 12V/60A

The alternator serves to keep the battery constantly charged. It is installed on the cylinder block by a
bracket, and is driven from the V-pulley at the end of the crankshaft by a V belt.
The type of alternator used in this engine is ideal for high speed engines with a wide range of engine
speeds. It contains diodes that convert AC to DC, and an IC regulator that keeps the generated voltage
constant even when the engine speed changes.

12.4.1 Specifications

Yanmar code
Model of alternator
Model of IC regulator
Battery voltage
Nominal output
Earth polarity
Direction of rotation
(viewed from pulley end)
Weight
Rated speed
Operating speed
Speed for 13.5V at 20°C
Output current for 13.5V
Regulated voltage
128271-77200
LR160-741 (HITACHI)
SA-A (HITACHI)
12V
12V/60A
Negative earth
Clockwise
4.2 kg
5000 min
1,050-18,000 min
1050 min
56A or more/ 5000 min
14.4±0.3V (at 20°C, voltage gradient, -0.01V/°C)
189
12. Electrical System
-1
-1
-1
or less
-1