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April 2018
Service and Repair Manual
Boom Components
Part No. 1287211GT
GTH-1056
17
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.
How to T est a Pr oximity Switch
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.
How to Adj ust the Boom Angle Proximity Swi tch
How to Adjust the Boom Angle
Proximity Switch
The boom angle proximity switch is attached to a
mounting bracket, located between the boom and
the chassis directly beneath the boom pivot pin.
The switch location is adjustable.
1 Start the engine.
2 Raise the boom to 60°. Confirm with a digital
level.
3 Working at the pivot end of the boom, locate
the boom angle proximity switch. Loosen the
fasteners, securing the proximity switch
assembly to the chassis, just enough to allow
the bracket to move.
4 Move the proximity switch assembly until the
light of the proximity switch turns on, then
move the proximity switch assembly until the
light of the proximity switch just turns off.
5 Securely tighten the fasteners. Do not over
tighten.
6 Lower the machine to 55°.
Result: The light of the proximity switch
assembly is illuminated.
7 Raise the boom to 60°. Confirm with a digital
level.
Result: The light of the proximity switch
assembly is not illuminated. The proximity
switch is properly calibrated.
Result: The light of the proximity switch
assembly is illuminated. The proximity switch
is not calibrated correctly. Repeat this
procedure beginning with step 4.
Содержание Genie GTH1056
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