JLG X17J Operator Manual - Manual (Page 64)

5.2 H AND PUMP
The hand pump (2) is used to pressurise oil for emergency movements made necessary by
any breakdown of the main hydraulic system.
The hand pump has a manual diverter (1) used to select whether to control the two right sta‑
bilisers (Position A) or to control the two left stabilisers and the aerial part of the structure
(Position B).
See paragraph “Emergency manoeuvres”.
5.3 S OLENOID VALVES FOR EMERGENCY DESCENT
The cylinders of the first‑second arm, of the third arm and the jib
have a solenoid valve for emergency descent (1). Activating the
emergency descent button on the remote control energises these
solenoid valves, which allow the descent of the aerial part of the
structure due to gravity.
The use of this emergency device depends on the platform’s elec‑
trical system being powered.
5.4 S AFETY D EVICE B YPASS K EY
The machine has a key device that acts on the electrical circuit, bypassing the platform safety
systems. The device is situated on the cover of the electrical components compartment.
The use of this selector switch is illustrated in the following paragraphs on how to use the
machine.
Considering the hazard deriving from the use of the platform during the bypass of the
safety devices, carefully read the paragraphs regarding the use of the safety device release
key selector switch.
1
2
A
B
1
X17JR0420113 60
BOOM LIFT MODELS X17J
JLG
PERICOLO DANGER