JLG X14JH Operator Manual - Manual (Page 40)

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2.5.3 CYLINDER STOP VALVES
The stabiliser cylinders are equipped with a double stop valve that, in case of breakdown of
the system or breaking of the tubes, stop the cylinder avoiding dangerous situations of
platform instability.
All the cylinders that move the overhead part of the platform structure are equipped with
stop valves that, in case of breakdown of the system or breakage of the tubes, stop the cylin‑
der avoiding that the control car drops through gravity.
Qualified people calibrate these valves when testing the platform and they must never be
tampered with.
2.5.4 PHOTOCELLS AND SWITCH ALIGNMENT OVERHEAD PART OF THE STRUC‑
TURE AND MACHINE BASE
The machine is provided with a double safety photocell which controls that the aerial part of
the structure of the machine is completely lowered and aligned with the base and that the
telescopic arm is completely retracted.
If one of these conditions does not occur, a signal is given to a switch that deactivates the
translation and the stabiliser movement and feeds the overhead part of the structure.
BOOM LIFT MODELS X14JH
JLG
X14JHR0220311