Part No. 39528 Genie GS-1530 & GS-1930
Service Manual - First Edition
Theory of Operation
Power Source
The Genie GS-1530 and GS-1930 machines are
powered by four six-volt (255 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-1530 and GS-1930 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 pad will send a
signal to the ECM through the multiplex card.
A diagnostic display is located at the battery pack
side of the machine to aid in troubleshooting. If the
machine malfunctions, a fault code will be shown in
the display window.
Washing electronic components is not suggested.
Instead, use compressed air to remove debris from
these components.
Component damage hazard. Avoid
shock or impact to the ECM.
Internal damage may not be visible
from the outside.
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