41
Lubrication System
22 690 01 Rev. --
KohlerEngines.com
Testing
Compressed air, a pressure regulator, pressure gauge,
and a continuity tester are required to test switch.
Identify switch used and follow appropriate testing
procedure.
3-Terminal Switch
A
B
C
D
E
F
A
Terminal 1 Power In
B
Terminal 2 Oil Pressure
C
Terminal 3 Power Out
D
Red Wire Power In
E
Green Wire Oil Pressure
F
Red Wire Power Out to Choke Thermostat
Test 1
1. Connect continuity tester across blade terminal #2
and metal case of switch. With 0 PSI applied to
switch, tester should indicate continuity (contacts
closed).
2. Gradually increase pressure to switch. As pressure
increases through range of 2-5 PSI, tester should
indicated a change to no continuity (contacts open).
Switch contacts should remain open as pressure is
further increased to 90 PSI.
3. Gradually decrease pressure through range of 2-5
PSI. Tester should indicate a change in continuity at
terminal (Switch closed) down to 0 PSI.
Test 2
1. Connect continuity tester leads at terminal #1 and
terminal #3 of switch. With 0 PSI applied to switch,
tester should indicate no continuity (contacts open)
between terminals #1 and #3.
2. Gradually increase pressure to switch. As pressure
increases through range of 2-5 PSI, tester should
indicated a change to continuity (contacts closed)
between terminal #1 and terminal #3 on switch.
Continuity condition between #1 and #3 terminals
should remain closed while pressure is further
increased to 90 PSI.
3. Gradually decrease pressure through range of 2-5
PSI. Tester should indicate a change in continuity
between terminals #1 and #3 (contacts open) down
to 0 PSI.
Replace switch if it does not operate as expected for
either test 1 or 2 as detailed above.
Single-Terminal Switch
A
A
Single Terminal Oil Pressure
1. Connect continuity tester across blade terminal and
metal case of switch. With 0 psi pressure applied to
switch, tester should indicate continuity (switch
closed).
2. Gradually increase pressure to switch. As pressure
increases through range of 2-5 psi tester should
indicate a change to no continuity (switch open).
Switch should remain open as pressure is increased
to 90 psi maximum.
3. Gradually decrease pressure through range of 2-5
psi. Tester should indicate a change to continuity
(switch closed) down to 0 psi.
4. Replace switch if it does not operate as specifi ed.
OIL PRESSURE
Testing
Engine oil pressure can be tested using an oil pressure
tester. Follow instructions included with tester. Pressure
can be tested by removing oil fi lter and installing tester
adapter on mounting pad, or by removing Oil Sentry
™
pressure switch (or pipe plug) and threading tester hose
directly into mounting hole.
