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Lubrication System
KohlerEngines.com 20 690 01 Rev. F
OIL SENTRY
™
(if equipped)
This switch is designed to prevent engine from starting
in a low oil or no oil condition. Oil Sentry
™
may not shut
down a running engine before damage occurs. In some
applications this switch may activate a warning signal.
Read your equipment manuals for more information.
Oil Sentry
™
pressure switch is installed into center oil
galley of fi lter adapter casting or into closure plate.
Based on application an elbow adapter may also be
used. On engines not equipped with Oil Sentry
™
, oil
galley is sealed with a 1/8" pipe plug or completely
sealed.
Installation
External Switch
1. Remove and discard pipe plug from center passage
of oil fi lter mounting pad.
2. Apply pipe sealant with Tefl on
®
(Loctite
®
PST
®
592
TM
Thread Sealant or equivalent) to threads of 90°
adapter (if used), and Oil Sentry
™
switch. Install
adapter (if used), and carefully tighten it to intended
position. Do not over tighten or damage adapter.
3. Install switch into adapter or center passage. Torque
switch to 4.5-5.0 N·m (40-45 in. lb.). Connect lead to
terminal on Oil Sentry
™
switch.
Switch Behind Blower Housing
1. Remove blower housing. Remove and discard pipe
plug from closure plate.
2. Apply pipe sealant with Tefl on
®
(Loctite
®
PST
®
592
TM
Thread Sealant or equivalent) to threads of Oil
Sentry
™
switch.
3. Install switch into closure plate. Torque switch to
4.5-5.0 N·m (40-45 in. lb.). Connect lead to terminal
on Oil Sentry
™
switch.
4. Reinstall blower housing.
Testing
Compressed air, a pressure regulator, pressure gauge,
and a continuity tester are required to test switch.
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
On some models 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.