Boom Components; Boom Proximity Switch; How To Test A Proximity Switch - Genie GTH-1056 Service And Repair Manual

Service and Repair Manual

Boom Components

1-1

Boom Proximity Switch

The boom angle switch is a proximity switch. This
switch functions by sensing a change in the
electromagnetic field of the switch, due to the
introduction of metal into the field. A proximity
switch is, simply, a metal detector.
The switch generates an electromagnetic field at
the face of the switch. This field senses when steel
has been moved close to the switch as well as
when the steel has been moved away, which is how
the switch contacts open and close.
These switches are of a fail-safe design. Should the
switch or the switch wire circuit be faulty, the
machine will not function outside its designed range
of use.
The boom proximity switch is a component of the
drive circuit and the chassis sway circuit. Both the
drive and the chassis sway functions are disabled
when the boom is raised to 60° or higher.
18
How to T est a Pr oxi mity Switc h

How to Test a Proximity Switch

1 Remove the switch from the machine. Do not
disconnect the switch wire harness from the
machine.
2 Start the engine.
3 Move the switch away from any ferrous or
metallic object
Result: The light of the limit switch assembly is
not illuminated.
4 Move the switch close to any ferrous or
metallic object
Result: The light of the proximity switch
assembly turns on. The switch is functioning
correctly.
GTH-1056
April 2017
Part No. 1278145