JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 105)

SECTION 5 - HYDRAULICS
3120271 – JLG Lift – 5-13
16. If applicable, secure the cylinder head gland using a
suitable spanner type wrench in the holes provided.
17. If applicable, secure the cylinder head retainer using
a suitable spanner type wrench in the holes pro-
vided.
18. After the cylinder has been reassembled, the rod
should be pushed all the way in (fully retracted) prior
to the reinstallation of any holding valve or valves.
19. If applicable, install the cartridge-type holding valve
and fittings in the rod port block using new o-rings
as applicable. (See Table 5-2, Holding Valve Torque
Specification).
IF THE CYLINDER IS TO BE TESTED PRIOR TO INSTALLATION ON
THE MACHINE, EXTREME CARE SHOULD BE USED TO INSURE
THAT THE OUTER END OF THE ROD IS SUPPORTED. USE
EITHER A TRAVELING OVERHEAD HOIST, FORKLIFT, OR OTHER
MEANS TO SUPPORT THE OVERHANGING WEIGHT OF THE
EXTENDING ROD.
NOTE: Steps 20 thru 23 apply to the Boom Telescope Cylin-
ders.
20. Elevate the barrel end of the cylinder to a work
bench or other suitable device.
21. Plug the retract port and supply hydraulic power to
the extend port.
22. Open the bleeder port plug (TP) venting all trapped
air to atmosphere. Retighten the bleeder port plug.
Disconnect the hydraulic power source and remove
plug from retract port.
23. An alternative to steps (20) through (23) is to posi-
tion the barrel horizontally in a suitable holding
device, attach a hydraulic power source to both
extend and retract ports, while supporting the cylin-
der rod, cycle the cylinder a minimum of 5 times with
the bleeder port unplugged venting all trapped air to
atmosphere. A suitable hose may be attached to the
bleeder port with the end in a container suitable to
contain the hydraulic fluid. After all air is vented
remove all attached hoses, and install the bleeder
port plug. Also plug the extend and retract ports until
cylinder is installed in boom.
NOTE: After torquing piston nut spot drill cylinder rod for
setscrews.
Table 5-1. Cylinder Piston Nut Torque Specifications
Description
Nut
Torque Value
(Wet)
Setscrew
Torque Value
(Dry)
Lift Cylinder 600 ft.lbs.
(814 Nm)
40 in.lbs.
(5 Nm)
Slave Cylinder 80 ft.lbs.
(109 Nm)
100 in.lbs.
(12 Nm)
Master Cylinder 80 ft.lbs.
(109 Nm)
100 in.lbs.
(12 Nm)
Steer Cylinder 80 ft.lbs.
(109 Nm)
100 in.lbs.
(12 Nm)
Steer Cylinder
(Oscillating Axle)
275-330 ft.lbs.
(380-456 Nm)
N/A
Lockout Cylinder N/A N/A
Telescope Cylinder 600 ft.lbs.
(814 Nm)
100 in.lbs.
(12 Nm)
Axle Extension Cyl. 50 ft.lbs.
(7 Nm)
100 in.lbs.
(12 Nm)
Axle Extension Cyl.
(Oscillating Axle)
100 ft.lbs.
(138 Nm)
100 in.lbs.
(12 Nm)
Axle Lift Cylinder 400 ft.lbs.
(553 Nm)
100 in.lbs.
(12 Nm)
Tie-Rod Cylinder
(Oscillating Axle) 150-180 ft.lbs.
(210-250 Nm)
N/A
Extend-A-Reach
Lift Cylinder 200 ft.lbs.
(271 Nm)
100 in.lbs.
(12 Nm)
Slave Cylinder 200 ft.lbs.
(271 Nm)
100 in.lbs.
(12 Nm)