B. Engine Manufacturer’s Equipment
As received from the engine manufacturer, the engine includes the following equipment which is de-
scribed in the John Deere Shop Manual
(Chapter 6)
.
(1) Fuel filter.
(2) Reverse-flow, engine cooling fan to blow air outward through the radiator.
C. Hobart Engine Equipment
The engine is modified at Hobart Brothers by the addition of the following equipment:
(1) Electric governor system
An electric governor kit is installed on the engine to replace a conventional, mechanical type. The
electric governor was selected for control of engine speed
(and generator output frequency)
be-
cause it provides faster engine response to changes in load conditions. This fast response results
in very close frequency control. Refer to the Woodward instruction booklet in Chapter 6 for a de-
tailed description. A brief description is given below:
The governor system consists of the following main components:
Magnetic pickup
Control unit
Actuator
(a) Magnetic pickup
The magnetic pickup is a device for detecting the speed of the engine. It is mounted in the fly-
wheel housing directly over the ring gear. It produces an AC signal to the control unit when
the ferrous flywheel teeth pass through the magnetic field at the end of the pickup.
(b) Control unit
The control unit
(9, Fig. 3)
is a box containing a compact assembly of solid state components.
It receives an AC signal from the magnetic pickup and senses speed changes in the engine.
It provides a voltage signal to the actuator which causes the actuator to move the fuel control
lever as required to maintain a predetermined engine speed. Its power is received from the
12-V DC battery system.
(c) Actuator
The actuator
(15 Fig. 3)
supplies the force needed to move and position the fuel lever as re-
quired to maintain a constant engine speed. The actuator is operated by a DC signal from the
control unit.
(2) Engine electrical system
Items in the 12-volt engine electrical system that are provided by Hobart Brothers are:
(a) A heavy-duty motor starter
(b) Alternator with voltage regulator
(c) Starting switch
(d) Wiring harness
OM-2029
September 30/89 Revised
1-1
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