Removal; Fig. 7-23: Boom Elevation Proximity Switch Operation; Fig. 7-24: Boom Elevation Proximity Switch Assembly - JLG Lull 1044C-54 II Series Service Manual

Frame Tilt and Oscillation

Removal

Boom Elevation Proximity
Switch
7-38
Transfer Carriage/Boom Cradle
Proximity Switch

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.
# Description
1 Transfer Carriage/Boom Cradle
2 Inner Jam Nut
3 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).
Magnetic Flux
Lines
Oscillator
1
2
3
4
5
A
MV0670
#
4 Outer Jam Nut
5 Wire Harness
Boom
Description
31200079