Yanmar 4LHA-DTP, Operation Manual

Page: 664 / 670

Chapter 9 Electrical System
6. Warning Devices
4LHA Series
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.
Operating temperature
ON 93 ~ (199 ~ 206
o
F)
Operating temperature
OFF 8 8
0
C (190
o
F) or high
Electric capacity
DC 12V, IA
Response time
with in 60 sec.
Indication color Green
Part code No.
127610-91350
Tightening torque 23.5--31.4(2.4~3.2)N(kgf)-m
Cooling water temperature switch
Thermostat housing
Fresh water pump
Pilot lamp
p
u s e
Main switch
Alarm buzzer
Water temperature unit
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.
Battery
(Water temperature alarm circuit)
57.7mm (2.2716in.)
M e d
-Green
Sender unit
PT3/8
9-38