June 2021 Service and Repair Manual
Platform Overload Components
Part No. 1306587GT GS
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-84 • GS
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-90 109
5 Activate and hold the calibration toggle switch
in the up position for 4 seconds to enter full
load calibration mode.
Result: The LCD screen first displays DOWN
CHK, then GO UP: ?.
6 Start the engine from the ground controls and
fully raise the platform.
7 When the platform has reached full height,
momentarily activate the calibration toggle
switch in the up position to confirm.
Result: The LCD screen first displays UP
CHK, then GO DWN: ?.
8 Fully lower the platform to the stowed
position.
9 When the platform is fully stowed,
momentarily activate the calibration toggle
switch in the up position to confirm.
10 Fully raise the platform from the ground
controls.
Note: The platform will raise and automatically
stop at predetermined points to gather data.
Continue holding the Function Enable and
Platform Up buttons until the platform has reached
full height.
11 When the platform has reached full height,
momentarily activate the calibration toggle
switch in the up position to confirm.
12 Fully lower the platform to the stowed
position.
Note: The platform will lower and automatically
stop at predetermined points to gather data.
Continue holding the Function Enable and
Platform Down buttons until the platform is fully
stowed.
13 When the platform is fully stowed,
momentarily activate the calibration toggle
switch in the up position to confirm.
Result: The LCD screen displays Success.
Calibration is complete.
14 Push in the ground controls red Emergency
Stop button to the off position.
Confirm Calibration:
1 Add additional weight to the platform.
-3384, GS-3390 500 l
227 k
-4390, GS-5390 300 l
136 k
2 Pull out the red Emergency Stop button to the
on position and start the engine.
3 Raise the platform.
Result: At a predetermined height the engine
shuts off, an audible alarm sound and
platform up function does not operate.
4 Cycle the red Emergency Stop button off,
then back on.
5 Use the emergency down function to lower
the platform to the stowed position.
6 Remove the weight or rated load from the
platform.