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8. Low Coolant Shutdown Assembly
A. Description
The low coolant shutdown assembly, when provided, is used with Specification 6911A-5 Hobart en-
gine-drive generator sets. Its purpose is to stop the engine before overheating, caused by low cool-
ant level, can occur. A liquid-level detector, mounted in the radiator, opens the power to the engine
coolant level solenoid when coolant drops to a predetermined level in the radiator.
NOTE: Radiator MUST be refilled after a low-coolant shutdown before engine can be restarted.
B. Location of Low Coolant Relay and Low Coolant Sensor
Figure 6 shows where the low coolant relay is installed on the rear of the generator control box., and
Figure 8 shows where the low coolant sensor is installed on the radiator. Engine schematic diagram
281886 in Chapter 6 identifies the low coolant shutdown sensor as item S45, and the low coolant re-
lay as K28.
C. Checking Operation of the Low Coolant Shutdown Assembly
The low coolant shutdown sensor, shown in Figure 8, has a TEST terminal, which permits testing of
the sensor by electrically simulating a low coolant condition. To check operation of the low coolant
shutdown sensor:
(1) Turn on the generator set and operate it at idle speed.
(2) Using a jumper wire with an alligator clip on each end, ground the TEST terminal on the low cool-
ant shutdown sensor. The generator set engine should shut off immediately.
October 1/95 Revised
OM-2031
Location of Low
Coolant Level
Switch
Figure 8
1-3
Page 13
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