JLG 4017RS Service Manual - Manual (Page 80)

Boom
3-40 3614RS, 4017RS
6. Start the engine and SLOWLY lower the boom until
there is a clearance of 6 mm (0.25 in) between the end
of the boom prop and the lift/lower cylinder rod end
(21).
7. Shut OFF engine.
b. Prop Removal
1. If needed, start machine and slowly raise the boom until
the boom prop is clear of the lift/lower rod end.
2. Remove the locking pins (20) and boom prop (19) from
the lift cylinder. Return the boom prop to the proper
location and secure.
3. Lower boom, shut engine OFF.
3.20 EMERGENCY BOOM LOWERING
PROCEDURE
3.20.1 Equipment and Supplies Required
Auxiliary Hydraulic Power Supply:
• Portable hydraulic unit or another machine with an
auxiliary hydraulic power supply with a capacity to
hold up to 35 L (9 gal) of hydraulic oil from the
machine during lowering process.
Hoses:
• Two Hydraulic Hoses - Approximately 3,0 m
(10 ft) each, with a minimum I.D. of
9,5 mm (0.375 in) and a minimum rating of
275,8 bar (4000 psi).
Fittings:
• Two -8 EO Caps
• Two -8 EO Plugs
Adaptors:
• Two -8 EO Adaptors
Note: Machine extend/retract and lift/lower hoses are -8 ORFS.
The adaptor size may vary depending on the hose ends of the
auxiliary hydraulic power supply.
NOTICE
EQUIPMENT DAMAGE. DO NOT operate with the boom
prop in place. Damage to the boom prop and/or the lift/
lower cylinder could occur.
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.
NOTICE
EQUIPMENT DAMAGE. Auxiliary Hydraulic Power
Supply hydraulic oil must be compatible with hydraulic
oil shown in Section 2.5, “Fluids, Lubricants and
Capacities.”