JLG G5-18A Service Manual - Manual (Page 45)

3-13 G5-18A, 2505H, 25.5
Boom
3.9 EMERGENCY BOOM LOWERING
PROCEDURE 3.9.1 Equipment and Supplies Required
Auxiliary Hydraulic Power Supply:
• Portable hydraulic unit or another machine with
an auxiliary hydraulic power supply with a capac-
ity to hold up to 3 gal (11,4 L) of hydraulic oil from
the machine during lowering process.
Hoses:
• Two Hydraulic Hoses - Approximately 10 ft
(3,0 m) each, with a minimum I.D. of
0.375 in. (9,5 mm) and a minimum rating of
4000 psi (275,8 bar).
Fittings:
• Two 1 in. (25,4 mm) - 14 ORFS Caps
• Two 1 in. (25,4 mm) - 14 ORFS Plugs
Note: Machine extend/retract and lift/lower hoses are -
14 ORFS. The adaptor size may vary depending on the
hose ends of the auxiliary hydraulic power supply.
WARNING
To avoid instability of the machine, the extend/retract
cylinder MUST BE fully retracted prior to retracting
the lift cylinder. If circumstances prevent retraction of
the extend/retract cylinder first, lower the lift cylinder
the minimum amount necessary and resume
retraction of the extend/retract cylinder as soon as
possible.
WARNING
Properly support the boom before attempting to
proceed with the emergency boom lowering
procedure.
WARNING
If possible, safely remove and/or secure the load on
the machine before starting the boom lowering
procedure. If load cannot be removed, the machine
load chart MUST be followed.
NOTICE
EQUIPMENT DAMAGE. Auxiliary Hydraulic Power
Supply hydraulic oil must be compatible with hydraulic
oil shown in Section 2.4, “Fluids, Lubricants and
Capacities.”