GROVE Published 10-21-2010, Control# 198-04 3-15
5540F/YB5515 SERVICE MANUAL ELECTRIC SYSTEM
Optional Engine Shutdown
General Description
Units with a diesel engine can be furnished with an automatic
engine shutdown, to protect the engine when the engine oil
pressure is too low or the engine water temperature is too
high. The electrical circuit (Figure 3-7) includes a mag relay
switch located behind the cab dash panel, two diodes in the
instrument panel wire harness, the warning indicator light
strip under the dash panel, the engine water temperature
and oil pressure senders, and the fuel shut off valve.
Circuit Function
When the engine oil pressure drops below a safe operating
pressure or the water temperature rises above a safe
operating temperature, the sending unit sends a signal to the
indicator light though either wire 142 or 143, illuminating the
light. It also, sends a signal to the mag relay switch under the
dash panel. Both senders are connected to the “S” terminal
of the relay through wire 19ES. To prevent current from one
sender (oil pressure), illuminating the other indicator light
(water temperature) the circuit has two diodes installed,
which allow current to travel in one direction only. The relay is
activated and cuts current from the “NC” terminal to the fuel
shut off valve, closing the valve and shutting off the engine.
a1360
FIGURE 3-7
Optional Engine Shutdown Wiring Diagram - Diesel Engine
Reference Only
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