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Service and Repair Manual
April 2017
Boom Components
18
GTH-1056
Part No. 1278145
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 t o T est a Pr oxi mit y 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.
Содержание GTH-1056
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Страница 127: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 117 Harness Map Control System Single Joystick ...
Страница 128: ...Service and Repair Manual April 2017 118 Harness Map Control System Ground Single Joystick ...
Страница 129: ...April 2017 Service and Repair Manual 119 Harness Map Control System Dual Joystick ...
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Страница 131: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 121 Harness Map Deutz TCD3 6 T4F Engine ...
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Страница 135: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 125 Harness Map Work Lights ...
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Страница 144: ...Service and Repair Manual April 2017 134 Harness Map Auxiliary Hydraulics Beacon and Top Gear Lockout ...
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