202
SJ82 T, SJ86 T
229040ABA
Section 5 – Procedures
Boom
5.4-22 Directional Sensing Limit Switch
(LS1)
LS1 detects when the turret is rotated more than 90°
from being in line with the base. When rotated past
90°, the directions for forward-reverse travel and left-
right steering are reversed. The platform controls
remain natural and operate as indicated as the turret
rotates about the base.
LS1 is normally closed and opens when the switch
roller contacts a cam on the top of the rotary manifold.
When rotating the turret, LS1 circuit opens as it rides
up on the cam. It closes when the switch roller is off
the cam.
LS1 is normally closed and held open when the
counterweight is over the steering axle.
1
2
3
M62368AA
Counterweight shown over steering axle
1. LS1 Limit Switch
2. Steering Axle
3. Counterweight
LS1 is mounted on the rotary manifold in the base
frame.
M62362AA
LS1 location on rotary manifold (some parts hid-
den for clarity)
NOTE
Make sure the switch roller rotates freely and the
plunger is free to move as the turret rotates.
M62367AA
Limit switch plunger and roller
WARNING
Ensure there are no personnel or obstructions in
the test area and there is sufficient room to drive
the machine and reposition the boom.
Check Switch Operation:
1.
Align the turret with the counterweight over the
steering axle. Verify the machine operates as
the controls indicate using the platform controls.
Check that forward–reverse controls and left–
right steering operate as indicated.
2.
Locate the terminal strip inside the base control
panel. Set the multi-meter to
continuity-check
mode.
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