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OM-2031
B. Theory of Operation
Wire leads are connected to the electrical circuitry of the generator set at various points
and routed to a receptacle connector, mounted on the engine control panel. They are con-
nected to the test box rotary switch by a plug connector and wiring harness.
The rotary selector switch is wired in such a manner that for any switch position, two pre-
selected test points in the generator set circuitry are connected for testing. The selector
switch may be rotated to any one of 22 positions, however not all positions are used in
this installation. An instruction plate mounted under the switch knob indicates switch posi-
tions and component tested in each position. Normal voltage for each test is also indi-
cated.
Two test jacks are provided for connection of the test prods of a voltmeter. After the volt-
meter is connected and selector switch positioned, the test circuit is closed by pressing
the pushbutton switch. A voltage value may then be observed on the voltmeter. This ar-
rangement prevents energization of test circuitry and equipment for extended periods and
allows the operator to reset and adjust the voltmeter without disconnecting it from the box.
For operating instructions, see Sect. 1-3, Para. 3
9. Special Equipment for Specification 6911A-5 Generator Sets
The assemblies below, which are optional on other units covered by this manual, are stand-
ard equipment for Specification 6911A-5 generator sets, and are installed at the factory when
a generator set of this specification is ordered by the customer.
A. Low-Fuel Shutdown Assembly with Pilot Light
This low fuel shutdown assembly, Hobart Part Number 285953, stops the engine when
the fuel level in the fuel tank becomes low before the unit runs out of fuel. A liquid-level
detector, mounted in the fuel tank, opens the power to the engine governor system when
fuel drops to a predetermined level in the fuel tank, and the pilot light that is a part of this
assembly comes on.
B. The Low Coolant Shutdown Kit
The low coolant shutdown kit on this generator set stops the engine before overheating,
caused by low coolant, can occur. A liquid-level detector, mounted in the radiator tank,
opens the power to the engine fuel valve 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.
C. Emergency Stop Switch
This switch, Hobart Part Number 285958, on the generator set control panel, is used
manually by the operator to stop the engine quickly and safely in the event of an emer-
gency observed by the operator.
D. Forklift Support Assembly
This assembly, Hobart Part Number 482743, permits the safe lifting of the generator set
with a forklift of sufficient lifting capacity. The forklift used should have a lifting capacity of
at least 5000 pounds (2267.6 kg) .
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April 30/96 Revised
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