Lull 1044C-54 Series II Service Manual - Manual (Page 320)

Frame Tilt and Oscillation
7-38 31200079
Fig. 7-23: Boom Elevation Proximity Switch Operation
(Ref. Fig. 7-23) 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 Elevation Proximity
Switch
Fig. 7-24: Boom Elevation Proximity Switch Assembly
1. (Ref. Fig. 7-24) Disconnect wire harness (Item 5) at boom proximity
switch (Item 3).
2. Place a piece of masking tape around proximity switch body at the
outer jam nut (Item 4) (this will serve as a guide during re-installation).
Proximity Switch
Transfer Carriage/Boom Cradle Boom
J
1108
Magnetic Flux
Lines
Oscillator
MV0670
A
5
2
1
3
4
# Description
1 Transfer Carriage/Boom Cradle
2 Inner Jam Nut
3 Proximity Switch
# Description
4 Outer Jam Nut
5 Wire Harness