Table of Contents
Advertisement
Boom
5.4-24 Fly-in Limit Switch (LS3)
LS3 limits machine drive speed to 1/2 mph (0.8 km/h)
when the boom is extended.
LS3 is normally closed. A slotted hole in the mid
boom trips the switch as the boom extends.
LS3 is the lower limit switch on the platform end of the
main boom.
LS3 location on main boom
NOTE
Make sure the switch roller rotates freely and the
switch arm is free to move as the boom extends
and retracts.
Limit switch arm and roller
SJ82 T, SJ86 T
WARNING
Ensure there are no personnel or obstructions
in the test area and there is sufficient room to
reposition the boom.
Check Switch Operation:
1. Retract the boom fully.
2. Place the boom in a horizontal position (or
slightly less than 0°).
3. Extend the boom outwards 4 ft (1.2 m). At
this point, the limit switch has tripped and the
contacts should be open.
4. Locate the terminal strip inside the base control
panel. Set the multi-meter to continuity-check
mode.
5. Place the multi-meter probes on terminal
positions (59 black/white) and (29 black).
6. Verify the switch circuit is open and there is no
continuity.
M62351AA
7. Retract the boom. Verify there now is continuity
in the circuit.
8. Extend and retract the boom to check switch
operation. The circuit should open and close
when the switch roller passes through the
M62364AA
slotted hole in the mid boom.
9. Perform a test drive to verify the machine drive
speed is slowed with the boom extended.
Section 5 – Procedures
29
59
Black
Black/White
LS3 terminal connections
M62352AA
229040ABA
205
Advertisement
Table of Contents
