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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.
Summary of Contents for GTH-1056
Page 65: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 55 ...
Page 67: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 57 ...
Page 69: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 59 ...
Page 71: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 61 ...
Page 73: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 63 ...
Page 75: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 65 ...
Page 128: ...Service and Repair Manual April 2017 118 Harness Map Control System Ground Single Joystick ...
Page 129: ...April 2017 Service and Repair Manual 119 Harness Map Control System Dual Joystick ...
Page 132: ...Service and Repair Manual April 2017 122 Harness Map Deutz 3 6TCD T4F Engine ...
Page 133: ...April 2017 Service and Repair Manual 123 Harness Map Perkins 1204 T4F Engine ...
Page 135: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 125 Harness Map Work Lights ...
Page 136: ...Service and Repair Manual April 2017 126 Harness Map Work Lights ...
Page 137: ...April 2017 Service and Repair Manual 127 Harness Map Road Lights ...
Page 138: ...Service and Repair Manual April 2017 128 GTH 1056 Part No 1278145 Harness Map Road Lights ...
Page 140: ...Service and Repair Manual April 2017 130 Harness Map Enclosed Cab with Heat ...
Page 141: ...April 2017 Service and Repair Manual 131 Harness Map Enclosed Cab with HVAC ...
Page 145: ...April 2017 Service and Repair Manual 135 Electrical Schematic ...
Page 146: ...Service and Repair Manual April 2017 136 GTH 1056 Part No 1278145 Electrical Schematic ...
Page 147: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 137 Electrical Schematic ...
Page 148: ...Service and Repair Manual April 2017 138 Electrical Schematic ...
Page 149: ...April 2017 Service and Repair Manual 139 Hydraulic Schematic Models with Single Joystick ...
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