Part No. 48339 Genie GS-2046 & Genie GS-2646 & Genie GS-3246
Service Manual - First Edition
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Theory of Operation
Power Source
The Genie GS-2046 & Genie GS-2646 & Genie
GS-3246 machines are powered by four six-volt
(225 AH) batteries. The four batteries are wired in
series to produce 24 volts.
Hydraulic System
All machine functions are performed by the
hydraulic system. The hydraulic system is
powered by a single-section gear pump. When the
pump is activated, it supplies hydraulic fluid under
pressure to the function manifold, where the
control valves are located. To protect from over-
pressurization of the hydraulic system, the pump
is provided with a pressure relief valve.
Activating a machine function is accomplished by
actuating or moving a switch and/or control
handle, which sends voltage to the ECM. The
ECM then sends the signal to the appropriate
directional control valve. The directional valve
determines which direction the hydraulic fluid will
travel. Computer software determines the volume
of fluid in relation to the proportional valve input
voltage.
Electrical System
Limit switches are found in various locations on
the machine. The function of a limit switch is to
communicate the operating position of the
machine to the ECM (Electronic Control Module).
When a change in signal is received from a limit
switch, the ECM responds by limiting the drive
speed to 0.5 miles per hour (0.8 km/h), according
to the default settings in the ECM software.
Machine Controls
The GS-2046 & GS-2646 & GS-3246 machines
are equipped with operational controls which are
found in two locations: the ground controls,
located on the hydraulic tank side of the machine,
and the platform controls, located in the platform.
All lift and drive functions are available at the
platform controls. Only platform up/down functions
are available at the ground controls.
The ECM uses input from the ground or platform
controls to activate the various machine functions.
The ECM has predetermined settings for the
various machine functions.
The joystick is fitted with a 5000 ohm
potentiometer. With the joystick in the neutral
position, the potentiometer will measure 2730
ohms. These signals are sent to the multiplex
card, then down to the ECM to control the voltage
supplied to the proportional valve. Two
microswitches mounted on the joystick tell the
ECM the drive direction desired. A thumb rocker
switch on the top of the joystick is used for
steering.
Mounted on the platform control box lid of
machines before serial number 17408 are buttons
and a switch that, when activated, sends a signal
to the ECM through the multiplex card. On
machines after serial number 17407, the platform
control box lid has a decal/membrane pad. This is
a touch-activated pad incorporating wiring,
switches and LEDs that are resistant to the
environment. Activating any of the buttons on the
