e. Sending units. Four sending units are used on
(3) An oil pressure gauge to indicate engine oil
the truck to provide a means of actuating corresponding
pressure in the engine crankcase main oil gallery.
gauges on the instrument housing. The following
A fuel gauge to indicate the fuel level in the
descriptions are given for each sending unit:
(5) An engine hourmeter to indicate the hours
(1) The fuel gauge sending unit mounted on
of operation of the truck which determines when periodic
top of the fuel tank float assembly contains an arc-
service operations are due.
shaped resistance coil. A radial contact, operated by a
float within the fuel tank, makes contact with the
(6) A light switch with ON/OFF positions to
resistance coil. Movement of the radial contact varies
activate the taillight.
the resistance of the fuel gauge circuit, permitting a
(7) An ignition switch with ON/OFF positions to
current flow which is proportional to the float position.
activate or deactivate the truck ignition system for
(2) The oil pressure sending unit is connected
operation in addition to energizing the instruments and
into the pressure side of the lubricating oil system. This
starter circuit up to the starter button.
unit contains a coil, the resistance of which varies with
A starter button to activate the starter
pressure. Actuating current to the instrument passes
through this resistance coil which varies the current, and
thus the indication, in proportion to the pressure on the
a. The basic structure of the fork lift truck is the
(3) The temperature sending unit is threaded
one-piece welded frame, to which all components and
into the engine cylinder head to sense and respond to
major assemblies of the truck are attached.
engine coolant temperature.
This unit contains a
temperature sensitive resistance coil which regulates the
b. The running gear is attached to the underside of
flow of actuating current to the engine temperature gage
the frame, the hoisting mechanism is mounted at the
in proportion to engine coolant temperature.
frame front end, and a counterweight is fastened to the
back of the frame. Since the frame houses much of the
(4) The oil pressure sensitive switch mounted
mechanism for the truck, access openings for service
on the oil filter assembly closes when pressure exists in
and maintenance are provided at appropriate locations.
the engine lubricating system, to energize the engine
hourmeter on the instrument housing. Thus, since
engine oil pressure is always (and only) present when
the engine is operating, the hourmeter will accurately
a. The operator's seat is mounted on top of a
reflect engine hours of operation.
hinged compartment cover. A manually operated latch
at the front of this cover permits raising the cover for
Instruments and controls.
access to the engine compartment from above. Two
g. Instrument housing assembly. The instrument
side engine compartment access doors are hinged and
housing assembly, mounted on the steering column
fitted with hand operated latches.
support assembly, includes the following gauges and
b. A radiator cover plate is bolted to the frame.
Since the radiator fill neck protrudes above this cover
An ammeter to indicate the battery charging
plate, it is seldom necessary to remove the plate for
service; therefore, it is not hinged. The operator's pedal
controls, the steering column, and leads to the
(2) A temperature gauge to indicate the engine
instruments and switches are mounted on or through a
coolant temperature in degrees Fahrenheit.