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16) ENGINE OIL PRESSURE
SWITCH
Description and Location
The engine oil pressure switch, 1, is located
in the front of the engine cylinder head.
The oil pressure switch is located on top of
the cylinder head. The engine oil pressure
switch closes (circuit completed) when
engine oil pressure is less than 29.4 kPa.
This illuminates an indicator light on the
instrument panel lights.
The engine oil pressure switch is closed
before the tractor engine is started, and is
opened after the engine is started. If the
indicator light fails to switch after the
tractor is started, the oil level inside the
engine may be low or there may be a problem
with the oil pump or relief valve assembly.
Engine Oil Pressure Switch Testing
1. Using an ohmmeter, touch one test lead to
the pressure switch terminal, 1, and the
other test lead to the threads of the switch
body, 2.
2. Observe the ohmmeter. There should be
little or no resistance, indicating
continuity in the switch.
If there is no continuity, the switch is
defective and needs replaced.
CAUTION:
Do not use high pressure compressed air for
the following test, otherwise damage may
occur to the oil pressure switch.
NOTE:
The following test is not a calibrated test.
The purpose of the test is to see if the switch
contacts open at pressure.
3. While the test leads are connected to the
switch, pressurize the switch oil pressure
port, 3, with low pressure 69～ 138 kPa
{0.7～ 1.4 kgf/c ㎡ } compressed air.
4. Observe the ohmmeter. While air pressure
is being supplied to the oil pressure port,
the ohmmeter should indicate high
resistance, or no continuity. If there is
continuity, the switch is defective and
needs replaced.
Installation
1. Install the oil pressure switch into the
engine cylinder head and tighten to 14.7～
19.6 N･m (1.5～ 2.0 kgf･m).
2. Install the ring terminal onto the oil
pressure switch, and secure the terminal
with the retaining screw, 1.
550Y
551Y
NOTE : If the oil pressure switch is too
mutch tightened, will be broken the
support backet.
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