JLG X23J Operator Manual - Manual (Page 69)

65
BOOM LIFT MODELS X23J
JLG
X23JR0620113
5.2 H
AND PUMP
The hand pump (2) is used to pressurise oil to carry out manoeuvres in the case of emer‑
gency due to breakdown of the main hydraulic system.
The hand pump has a manual diverter (1) that allows to select whether to control the two
right outriggers (Position B) or to control the two left outriggers and the aerial part of the
structure (Position A).
The hand pump has a removable handle inside the aerial
part proportional distributor protection sump.
5.3 S
OLENOID VALVES FOR EMERGENCY DESCENT
The first‑second arm cylinders, of the third arm and jib have a
solenoid valve for emergency descent (1). By acting on the emer‑
gency descent button on the remote control these solenoid valves
are excited, which allow the descent of the aerial part of the
structure due to gravity.
The use of this emergency device is linked to the presence of vol‑
tage in the platform electric plant.
Follow the arrangements stated in point.
5.4 S
AFETY DEVICES BY
‑
PASS KEY
The machine has a key device that intervenes on the electric circuit, by‑passing the platform
safety systems. The device is situated on the lid of the electric components box in the electric
components compartment.
The use of this selector switch is illustrated in paragraphs.
1
2
A
B
1