Page 59
45-J Desel - Servce & Parts Manual
January 2022
Secton 17 - Calbraton Problems
Check “CALIBRATIONS / HEIGHT CALS”; the “ElevDown” value shows the recorded height
where the switch opened. Check that the boom is fully retracted.
F19:HIGH ELEV������CLOSE
This message is given if the elevation switch (P7-5) closed during lower at a too high height
(above 25%).
Check “CALIBRATIONS / HEIGHT CALS”; the “ElevUp” value shows the recorded height where
the switch opened. Check that the boom is fully retracted.
F20:HEIGHT1<>0%
F20:HEIGHT2<>0%
This message occurs if the platform height is not 0% after the platform has been fully lowered
at the end of a calibration step. The platform must return to the same height each time it is fully
lowered.
Check “DIAGNOSTICS / SYSTEM” to check the height.
F22:HEIGHT1<>100%
F22:HEIGHT2<>100%
This message occurs if the platform height is not 100% after the platform has been fully raised
during a calibration step. The platform must return to the same height each time it is fully raised.
Check “DIAGNOSTICS / SYSTEM” to check the height.
F24:TOO MANY
This message occurs if too many static measurements are taken during a calibration step.
In the rare event that this occurs, please call MEC for assistance.
F27:BAD HEIGHT
This message indicates a problem with the height sensor output (P8-2) during the “STATIC”
calibration phases.
The height sensor output must be between 1.00V and 4.00V at all times.
Check DIAGNOSTICS / SENSORS to see the output. A reading of 0V or 5V is probably due to a
wiring problem.
F30:BAD HEIGHTS
This message indicates that the recorded heights are not increasing during “STATIC” lift, or are
not decreasing during “STATIC” lower.
This problem may be caused by repeatedly opening and closing the UP or DOWN switch during
the “STATIC” phases.
F34:REJECT CURVE
The “DYNAMIC” pressure curve is unacceptable.
There is not enough difference between the initial pressure peak and the minimum pressure.
Check for proper weight in the platform and check pressure sensor and lift cylinder hydraulics.
F40:REJECT DELTA DOWN @
F40:REJECT DELTA UP @
This message indicates that there is not enough difference between the loaded & empty
pressure.
This message could occur if the platform were not properly loaded during the STATIC LOADED
phase, or if the platform were not properly empty during the STATIC EMPTY phase.
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