Oil Pressure Switch - Toro Greensmaster 3250-D 04383 Service Manual

Oil Pressure Switch

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.
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 white/red wire
from the switch and ground it to the engine block.
3. If the lamp comes on the switch is bad.
4. If the lamp does not come on after step 2, check the
indicating circuit (see Electrical Schematic in Chapter 8
− Electrical Diagrams).
Testing with the engine on
1. If the lamp is on with the engine running, shut off the
engine immediately.
2. Disconnect the white/red 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 Circuit Drawings in Chapter 8 −
Electrical Diagrams).
5. Return ignition switch to OFF and connect the white/
red 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 14 psi
at 1000 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 (Rev. C)
1
1. Flywheel
Page 5 − 18
2
Figure 22
2. Oil pressure switch
Greensmaster 3250−D