Canopy; Engine, Generator, And Controls; Engine Description - Hobart JET-EX 4 Operation And Maintenance Manual

5. Canopy

The standard canopy is a sheet metal enclosure which protects the engine, generator, and electrical con-
trols. It has one large, hinged door at the left front to provide access for service and maintenance. Panels
at the rear provide access to the generator. A Plexiglas window is mounted above the control panel to al-
low observation of the instruments while protecting them from the weather. The right rear panel has a
round hole in it to permit viewing the fuel gage mounted in the fuel tank.

6. Engine, Generator, and Controls

A. General
Refer to Figure 3. The engine (3) and generator (15) are mounted on a welded steel frame (10). A fuel
tank support (7) located at the rear of the unit supports the fuel tank (13) and provides a mounting frame
for the load contactor and output terminals (2). The radiator (5) is mounted to the front canopy. A heavy U-
bolt is attached to the centrally located lifting yoke (12) for moving the generator set with a crane or hoist.
B. Engine
(1) General
The in-line four cylinder engine is a Ford Model LSG 423I-6005-A. It has 140 cubic inch (2.3 li-
ters) cylinder displacement and uses no lead gasoline.
The ignition distributor is mounted on the left side of the engine and is driven by a gear on the
camshaft. The distributor, in turn, drives the oil pump through a short intermediate drive shaft.
Oil pressure is maintained in the lubrication system by a rotary oil pump located in the crankcase.
A spring-loaded relief valve in the pump limits maximum pressure in the system. A full-flow oil fil-
ter (16, Figure 3) cleans the entire output of the pump before it enters the oil distributing system.
A valve in the filter provides a bypass to an oil gallery in case the filter becomes clogged. A low oil
pressure switch is mounted on the engine block as a protective device. The primary ignition circuit
is wired through the contacts of this switch, which closes at 10 PSI (69 kPa). This prevents the en-
gine from running if oil pressure will not build up, and also shuts down the engine if oil pressure
drops radically during operation. A vacuum switch mounted in the intake manifold prevents ener-
gizing of the starter motor once the engine is running.
See Figure 2 and the engine operator's manual for engine specifications.
The generator and engine are mounted on a welded steel skid, and are enclosed by a sheet met-
al canopy that bolts to the skid. Access to engine serviceable components (oil filter, air cleaner,
etc.) is through a gull-wing door at the front left of the machine.
Two removeable panels to the right side and one to the left rear allow access to the other compo-
nents such as spark plugs, load contactor and output terminals. The rear panel is removeable and
permits access to the rectifier assembly.
May 20/89
OM-2049
1-1
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