Service Manual

Oil Pressure Switch (GR 3200–D)
The switch is located on the front cylinder head above
the injection pump and governor assembly. It is a nor-
mally closed switch and opens with pressure. The oper-
ating range for the switch is 2.8 to 5.7 PSI (0.2 to 04
kg/cm
2
).
Testing with the engine off
1. Turn the ignition switch to ON. The oil pressure lamp
should be on.
2. If the lamp is not on, disconnect the brown wire from
the switch and ground it to the engine block.
3. If the lamp comes on the switch is bad.
1
Figure 36
1. Oil pressure switch
4. If the lamp does not come on after step 2, check the
indicating circuit (see Electrical Schematic (3200–D).
Testing with the engine on
1. If the lamp is on with the engine running, shut off the
engine immediately.
2. Disconnect the brown wire from the switch.
3. Turn the ignition switch to ON. The oil pressure lamp
should go out.
4. If the light is still on, check for short circuiting in the
indication
circuit (see Indicating and Safety Circuits).
5. Return ignition switch to OFF and connect the
brown wire to the switch.
6. Remove switch and install test gauge in the oil pres-
sure switch port.
7. Start the engine and check for a minimum of 30 psi
at 1400 RPM. If the engine oil pressure is low, shut off
the engine immediately.
8. Shut off the engine and remove the test gauge.
9. If the engine oil pressure is good, replace the switch.
Electrical
System
Greensmaster 3200/3200–D
Page 6 – 37
Electrical System