10.13.10 Joystick - JLG sky trak mmv Service Manual

10.13.10 Joystick

The multi-function joystick (16) controls boom movement,
attachment tilt and vehicle frame sway (refer to Section
10.7.17, Frame Sway Circuit and Troubleshooting .)
The joystick is equipped with several momentary switch-
es ("buttons") that enable the joystick to operate in four
specific modes. The mode available per selection is dis-
played on a logic panel located just forward of the joy-
stick. The logic panel will illuminate an indicator for the
specific mode that corresponds with the movement of the
joystick and the button(s) selected.
Two functions can be accomplished at the same time by
moving the joystick in between quadrants. For example,
moving the stick forward will lower the boom, and moving
the stick to the left will retract the boom; moving the joy-
stick forward and to the left will both lower and retract the
boom at the same time.
The speed of movement relates to the amount of joystick
movement away from the center position. The overall
speed of movement also depends directly on engine rpm.
IMPORTANT: When the joystick is in an off-center posi-
tion, the mode will change immediately upon releasing
any button.
Model MMV Rev. 12/04
Joystick mode operation can be checked according to the
joystick operation instructions found in the Owners/Oper-
ators Manual for this vehicle. Operational checks will in-
dicate whether the system is working properly. If a
designated function does not occur as described, check
both the electrical and hydraulic circuit involved to deter-
mine the cause. (Refer to Section 10.7.18, Boom Extend/
Retract Circuit and Troubleshooting and Section 10.7.19,
16
Boom Lift/Lower Circuit and Troubleshooting .)
a. Joystick Button Testing
1. Remove the four button head capscrews (17) securing
the logic panel (18) to the side console (19).
OS0151
2. Carefully pry the panel (20) up away from the
console and locate the six-wire connector (21) that
comes from the joystick.
3. Inspect the wiring and connector plug for obvious
signs of shorts, damage, etc.
4. Disconnect the harness half. Test only the joystick
half.
Electrical System
17
19
20
18
SS1210
21
MS2540
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