SHUTOFF AND ALARM SYSTEM COMPONENTS
TESTING AND ADJUSTING
Connect the 8S4627 Circuit Tester (5) between
the NO and the C terminals of the contactor
switch. The light must be off. If the light is on,
push reset button (6).
Gradually make an increase in the rpm. Read
the rpm on the tachometer at the moment the
light of the circuit tester is activated. The
reading will give the engine rpm (2 rpm on the
scale for each rpm the input shaft is turned).
+ 10 RPM
+ 25 RPM
If needed, make an adjustment to the contactor
switch by loosening lock screws (7). Turn the
cap clockwise to lower the overspeed setting.
Tighten the lock screws.
To check other components in the system, put a
jumper wire between the "C" and "NO" terminals
of the contactor switch.
OVERSPEED CONTACTOR SWITCH
6. Reset button. 7. Lock screws.
Check the resistance of the magnetic pickup
with the wires (2) disconnected and the engine
stopped. The resistance must be according to
1. Clearance. 2. Wires.
Start the engine. Check the voltage output of
the magnetic pickup with the engine running at
normal sped. The output must be according to
MAGNETIC PICKUP INSTALLED
NOTE : If the voltage output is not correct according to
specifications, check for the correct clearance (I)
between the magnetic pickup and the flywheel gear
If the operation of the magnetic pickup is correct
according to the specifications after the tests
above, connect the wires and check the
operation of the electronic speed switch.
OIL PRESSURE AND WATER
TEMPERATURE SHUTOFF (MECHANICAL)
9S9102 Thermistor Thermometer Group,
2F7112 or a 7F6785 Thermometer.
Make a restriction to the flow of air through the
radiator or to the flow of coolant through the engine.