Oil Pressure Switch - Toro Reelmaster 3100-D Service Manual

Oil Pressure Switch

Testing
Reelmaster ® 3100-D/3105-D
20252SL Rev A
g346755
1. Alternator
The engine oil pressure switch is located on the engine below the alternator
(Figure 127). The oil pressure switch is a normally closed switch that opens with
pressure. The oil pressure switch should open at approximately 8 PSI.
If low engine oil pressure allows the oil pressure switch to close during engine
operation, the engine oil pressure light should illuminate.
If the oil pressure indicator light is illuminated with the engine
running, shut off the engine immediately. Check the indicator light,
circuit wiring, pressure switch, and engine lubrication system to
identify the cause of the illuminated indicator light.
Note: Refer to Engine Service Manual
lubrication system and testing.
1. Park the machine on a level surface, lower the cutting deck, set the parking
brake, and shut off the engine.
2. Turn the key switch to the ON position. The oil pressure indicator light on the
control panel should be illuminated.
3. If the indicator light is not illuminated:
A. Unlatch the hood and raise it.
B. Locate the engine oil pressure switch on the engine and disconnect the
wire harness connector from the switch.
C. Connect a multimeter (ohms setting) across the switch harness connector
terminals to check the continuity of the switch:
• With the engine shut off, there should be no continuity between the
switch harness terminals.
• With the engine running, there should be continuity between the switch
harness terminals.
4. If the testing determines that the oil pressure switch is not operating correctly,
check the pressure switch and/or pressure switch harness for continuity.
Repair or replace the components as necessary.
Figure 134
2. Oil pressure switch
IMPORTANT
for information regarding engine
Page 6–33 Electrical System: Component Testing