JLG 120-SXJ ANSI Service Manual - Manual (Page 46)

SECTION 3 - CHASSIS & TURNTABLE
3-18 – JLG Lift – 3121105
Immediately beyond this point of balance the turntable is
permitted to pivot a maximum vertical distance of 3 mm.
This movement is sensed by two independent switches
which power two independent control circuit channels.
1. A positive break mechanical limit switch.
2. An inductive proximity switch.
Each circuit channel is arranged as follows:
The switch provides a 12 volt dc signal to a circuit card.
The output from this card energizes a relay which permits
the functional signals for boom extend and descend.
When an input signal to a channel or an output signal
from a circuit card is not present, the lift down and tele-
scope out functions are interlocked.
There is also a warning horn signal present, at both the
platform console and ground box, when either channel is
not energized.
Load Management System Daily Check
At the beginning of each days’ use, perform check with no
load (persons or material) in platform from ground control
station.
1. Extend all axles fully and insert lock pins (if applica-
ble).
2. With boom fully retracted, raise boom to horizontal.
3. Position toggle switch located on the right side of
the ground control station in the “P” position and
hold.
4. Extend boom until it stops. Boom must stop on
white tape on mid boom. Release toggle switch.
5. Retract boom until the telescope out will function.
The system is now reset.
6. Position toggle switch located on the right side of
the ground control station in the “M” position and
hold.
7. Extend boom until it stops. Boom must stop on
white tape on mid boom. Release toggle switch.
8. If boom does not stop at white tape or boom can be
extended, system must be repaired by JLG autho-
rized service personnel before machine can be
used.