Gen3 - Installation - Generic Stabiliser State Signals
When the stabilizers are down the lifting capacity increases, the Gen3 LMS requires the
stabilizer state to display the correct rating chart.
The purpose of this Tech Doc is not to provide a wiring setup for any specific telehandler, but rather to provide generic guidance for customers when trying to troubleshoot electrical issues. Your kit may, or may not have the same components as illustrated within this Tech Doc.
Most of the newer machine electronics have an indicator on the dashboard when the
stabilizers are lowered. This is usually determined via pressure switches installed in the
counterbalance valves on the stabilizer legs. These pressure switches are usually
configured like a 2 throw switch, with a common, normally open and normally closed.
When the stabilizer is in the up position the switch is not triggered, meaning there is a
connection between the common and normally closed lines, when the stabilizer is in the
down position, the switch is triggered and there is a connection between the common and
normally open lines.
A 2-Pin connector with 2 bare wires will have been supplied with the kit, called the
stabilizer input connector. Splice the green wire going into pin 1 of the stabilizer input
connector into the normally open line on the left stabilizer pressure switch and splice the
red wire going into pin 2 of the stabilizer input connector into the normally open line on the
right stabilizer pressure switch.
If the stabilizer input signals can not be connected in the
cabin, extend the wires and connect down at the pressure
switches
Some machines have just a single indicator on the dashboard which is lit when both
stabilizers are down. This is usually done by connecting the stabilizer switches together in
series with just a single output line from the stabilizer switches. The Gen3 LMS can be
connected in the same way, just connect both the green and red wires into the output line.
Some machines use limit switches to indicate when the stabilizers are down, these would
have similar switching characteristics to pressure switches and be connected to the Gen3
LMS in the same manner.
If the common line is a ground signal, the diode direction in
the wire loom will need to be reverse
Some of the older style machines don't have any kind of switches to indicate when the
stabilizers are down, so switches will need to be installed. There are a few options available.
First contact the machine manufacturer to see if they have a stabilizer switch upgrade kit
available. With the newer requirements for LMS systems being fitted, most manufacturers
can supply update kits for the older models. If there is no update kit available, pressure switches can be installed into the
counterbalance valve of the stabilizer lifting ram. The pressure switch needs to be
connected between the counterbalance valve and the head of the stabilizer lifting ram, so
that it switches when there is pressure on the head of the cylinder. There may be a port
available on the counterbalance valves or may require drilling into the counterbalance
valves to connect the pressure switches. The connections into the stabilizer input
connector will be the same as factory installed switches, but a 12V power line will need to be
connected into the common of both pressure switches.
Pressure switches indicate when the stabilizers are down on
solid stable ground. Limit switches only indicate when the
stabilizers are down. Install pressure switches if possible.
If pressure switches can't be fitted, limit switches can be installed on the stabilizer legs.
Limit switches with rotating arms are usually the easiest to install. The switch may need to
be mounted on a bracket in order to switch at the correct position. The switch should
trigger when the stabilizer leg is fully extended. The connections into the stabilizer input
connector will be the same as fitting into pressure switches.
Limit Switches on Bobcat Stabilizers
If pressure or limit switches can't be installed, a single pole switch in the dashboard can be
installed. Connect the green and red wires to one side of the switch and 12V to the other
side of the switch. This option is not recommended as the operator can inadvertently leave
the switch in the stabilizer down state.
Use pressure sensors instead of pressure switches, the Gen3
LMS does not support pressure sensor inputs into the
stabilizer connections. One of the options for machines that
don't have switches will need to be installed.
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