Lull 1044C-54 Series II Service Manual - Manual (Page 260)

Boom and Transfer
6-118 31200079
Fig. 6-120: Boom Extension Proximity Switch Operation
(Ref. Fig. 6-120) The switch operates by sending out a constant, high
frequency magnetic field a short distance from the oscillator end of the
switch. Eddy currents are produced in metal when the magnetic flux lines
pass through it. These eddy currents oppose the oscillations of the
magnetic flux lines and the oscillations stop. A sensor in the switch detects
if the oscillator is on or off and this gives the switch its on/off function.
Removal
Boom Extension
Proximity Switch
Fig. 6-121: Boom Extension Proximity Switch Assembly
Proximity Switch
Outer Boom Section
Middle Rear)
Boom Section
J
1259
Magnetic
Flux Lines
Oscillator
0
80
60
40
20
J
1145
1
# Description
1 Inner Jam Nut
2 Proximity Switch
# Description
3 Outer Jam Nut
4 Wire Harness
2
3
4