Warning Devices; Oil Pressure Alarm - Yanmar 3YM30 Sevice Manual

12.7 Warning devices

12.7.1 Oil pressure alarm

If the engine oil pressure is below 0.01-0.03 MPa (0.1-0.3 kgf/cm
switch in the ON position, the contacts of the oil pressure are closed by a spring and the lamp is
illuminated through the lamp
the contacts of the switch are opened by the lubricating oil pressure and the lamp remains off.
Pilot lamp
Alarm buzzer
Oil pressure switch
(Oil pressure alarm circuit)
Oil pressure
Rated voltage
Operating pressure
Lamp capacity
oil pressure switch
Main switch
Fuse
Battery
12V
0.04-0.06 MPa
(0.4-0.6 kgf/cm
5 W
2
, 1.42-4.26 lb/in.
ground circuit system. If the oil pressure is normal,
Lube oil pressure
switch
Lube oil filter
2
)
Spring
(Oil pressure switch)
197
12. Electrical System
2
), with the main
Cylinder block
Contacts
Oil pressure