Testing the Oil Pressure Switch
Note: Refer to the Engine Service Manual https://network.ventrac.com/resources/
manuals_engine for information regarding engine lubrication system and testing.
1. Park the machine on a level surface, lower any attachments to the ground,
engage the parking brake and remove the key from the ignition.
2. Switch the main circuit breaker to the O
FF position, to de-energize the electrical
system.
3. Locate the engine oil pressure switch on the engine and disconnect the wire
harness connector from the switch. Check the switch and the harness connector
for damage or corrosion and clean or repair as necessary.
4. Connect a multimeter (ohms setting) to check the continuity of the switch:
A. With the engine off, the oil pressure switch should be closed so there should
be continuity between the switch terminal and the metal switch body.
B. With the engine running, the oil pressure switch should be open so there
should not be continuity between the switch terminal and the metal switch
body.
5. Replace the switch if testing determines that the switch is damaged.
6. If the switch tests correctly and a circuit problem still exists, check the machine
wire harness; refer to 9 Appendix A, page 9–1.
7. After testing, connect the engine wire harness to the switch.
8. Switch the main circuit breaker to the O
N position, to energize the electrical
system.
4520P Page 6–59 Electrical System: Oil Pressure Switch
09.40003Rev 00
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