Service manual

3. Electrical Parts
3-42
5. Engine stops (normal stop)
SG06037E
1) To stop engine, handle starter switch to open BR contact (“Stop” position) so that excitation circuit
of motor stopper relay may be released to move the contact point as shown in Fig e.
2) As battery voltage is applied to motor stopper relay No.6 terminal, the following circuit is formed:
motor stopper relay No.3 terminal → motor stopper assembly No.3 terminal → motor → grounding,
and motor rotates and contact plate rotates.
3) The contact plate continues to turns from 180˚ position shown Fig e to the 360˚ position in Fig a via
Fig f position. At the same time when the contact plate rotates the wire is pulled to close fuel line
circuit by the fuel line connected to injection pump to close the fuel circuit to stop engine.
4) Motor and contact plate stop to rotate at specified position in Fig a, and return to the position in
the clause “ 1. Before engine starts ”.
6. Emergency stop
1) In case of abnormal conditions such as engine oil pressure drop, engine water temperature drop,
emergency stop circuit if controller functions to open the contact between controller No.8 and No.1
terminals to release excitation circuit of motor stopper relay. The process of engine stopping is the
same process which is mentioned from 2) “ 5. Engine stops (normal stop) ”.