Yanmar 4LHA-HTP Operation Manual page 664

Chapter 9 Electrical System
6. Warning Devices
6-2 Cooling water temperature alarm
A water temperature lamp and water temperature gauge,
backed up by an alarm in the instrument panel, are used to
monitor the temperature of the engine cooling water. A
high thermal expansion material is set on the end of the
water temperature unit. When the cooling water tem-
perature reaches a specified high temperature, the con-
tacts are closed, and an alarm lamp and buzzer are ac-
tivated at the instrument panel.
Cooling water temperature switch
Fresh water pump
Pilot lamp
Alarm buzzer
Water temperature unit
(Water temperature alarm circuit)
57.7mm (2.2716in.)
M e d
PT3/8
Thermostat housing
p Main switch
u s e
Battery
-Green
Operating temperature Operating temperature
Electric capacity
Response time
Indication color
Part code No.
Tightening torque
6-3 Sender unit for lube oil pressure gauge
Oil pressure is measured when the oil enters into the main
gallery after being fed from the lube oil cooler and passing
through oil pressure control valve. Make sure to mount a
vibration damper when mounting the oil pressure sender
unit.
Sender unit
9-38
4LHA Series
ON 93 ~ (199 ~ 206
OFF 8 8 C (190 F) or high
0 o
DC 12V, IA
with in 60 sec.
Green
127610-91350
23.5--31.4(2.4~3.2)N(kgf)-m
F)
o