Sender Unit For Lube Oil Pressure Gauge - Yanmar 3JH4E Service Manual

Inspection
Problem
Lamp not 1. Oil pressure lamp
illuminated when
main switch set to
ON.
2. Operation of oil
Lamp not 1. Oil level low.
extinguished
while engine
2. Oil pressure low.
running.
3. Oil pressure faulty. Switch faulty if abnormal at (1) and
4. Wiring between
12.7.2 Sender unit for lube oil pressure
gauge
The sender unit for the lube oil pressure gauge has
a mounting seat for mounting on the lube oil filter
bracket. Oil pressure is measured when the oil
enters into the main gallery after being fed from the
lube oil cooler and passing through the oil
pressure control valve. Be sure to mount a
damper when mounting the oil pressure sender
unit.
Lube oil pressure sender unit
Part code No.
Type
Rated voltage
Max. operating pressure
Inspection Item
(1) Visual inspection.
blown out. (2) Lamp not illuminated even when
Lamp illuminated when checked as
pressure switch. described in (2) above.
Stop engine and check oil level with
dipstick.
Measure oil pressure.
(2) above.
Cut the wiring between the lamp and
lamp and oil switch and wire with separate wire.
pressure switch
faulty.
119773-91650
Resistance switch
DC 12V
0.98 MPa (10 kgf/cm
Inspection method
main switch set to ON position
and terminals of oil pressure
switch grounded.
OPTIONAL
Oil pressure
sender
Damper
Oil pressure switch
2
)
313
12. Electrical system
Corrective action
Replace lamp.
Replace oil pressure
switch.
Add oil.
Repair bearing wear and
adjust regulator valve.
Replace oil pressure
switch.
Repair wiring harness.
Cylinder block
M4 ISO R1/8 Taper
011079-00E
011076-00E