Cylinder Piston Nut Torque Specifications - JLG 120HX Service And Maintenance Manual

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SECTION 2 - PROCEDURES
NOTE: Self-locking setscrews used on piston nuts should be
discarded and replaced whenever they are removed.
Table 2-2. Cylinder Piston Nut Torque Specifications
Nut Torque Value
Description
(w/Loctite)
Axle Extension 400 ft. lb. (542
Cylinder Nm)
Extend-a-Reach 400 ft. lb. (542
Cylinder Nm)
Frame Jack 400 ft. lb. (542
Cylinder Nm)
Level/Slave 200 ft. lb. (271
Cylinder Nm)
Lift Cylinder 600 ft. lb. (813
Nm)
Master Cylinder 80 ft. lb. (108 Nm)
Steer Cylinder 80 ft. lb. (108 Nm)
Telescope 600 ft. lb. (813
Cylinder Nm)
8. If applicable, install the setscrew(s) which secure the
piston attaching nut to the diameter groove.
9. Remove the cylinder rod from the holding fixture.
10. Place new o-rings and seals in the applicable out-
side diameter grooves of both the piston and the cyl-
inder head.
11. Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLINDER ROD, HEAD, AND PISTON. AVOID PULLING THE ROD
OFF-CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON
AND CYLINDER BARREL SURFACES.
12. With barrel clamped securely, and while adequately
supporting the rod, insert the piston end into the
barrel cylinder. Ensure that the piston loading o-ring
and seal ring are not damaged or dislodged.
13. Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into the barrel cyl-
inder or, if applicable, until the cylinder head threads
engage the threads of the barrel.
2-16
14. If applicable, secure the cylinder head retainer using
15. After the cylinder has been reassembled, the rod
Setscrew Torque
Value (w/Loctite)
16. If applicable, install the cartridge-type holding valve
100 in. lb. (11
Nm)
100 in. lb. (11
Nm)
IF THE CYLINDER IS TO BE TESTED PRIOR TO INSTALLATION ON
100 in. lb. (11
THE MACHINE, EXTREME CARE SHOULD BE USED TO INSURE
Nm)
THAT THE OUTER END OF THE ROD IS SUPPORTED. USE
EITHER A TRAVELING OVERHEAD HOIST, FORKLIFT, OR OTHER
100 in. lb. (11
MEANS TO SUPPORT THE OVERHANGING WEIGHT OF THE
Nm)
EXTENDING ROD.
200 in. lb. (22
Nm)
100 in. lb. (11
Nm)
Sun - 7/8 hex M20 x 1.5 thds
100 in. lb. (11
Nm)
Sun - 1-1/8 hex 1-14 UNS thds
200 in. lb. (22
Nm)
Sun - 1-1/4 hex M36 x 2 thds
Racine - 1-1/8 hex 1-1/16 - 12 thds
Racine - 1-3/8 hex 1-3/16 - 12 thds
Racine - 1-7/8 hex 1-5/8 - 12 thds
NOTE: Steps (17) through (20) apply to the telescope cylin-
17. Elevate the barrel end of the cylinder to a work
18. Plug the retract port and supply hydraulic power to
19. Open the bleeder port plug (TP), venting all trapped
20. An alternative to steps (18) through (20) is to posi-
– JLG Lift –
a suitable spanner type wrench in the holes pro-
vided.
should be pushed all the way in (fully retracted) prior
to the reinstallation of any holding valve or valves.
and fittings in the rod port block using new o-rings
as applicable.
Table 2-3. Holding Valve Torque Specifications
Description
der.
bench or other suitable device.
the extend port.
air to atmosphere. Retighten the bleeder port plug.
Disconnect the hydraulic power source and remove
plug from retract port.
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
Torque Value
30-35 ft. lb.
(41-48 Nm)
45-50 ft. lb.
(61-68 Nm)
150-160 ft. lb.
(204-217 Nm)
50-55 ft. lb.
(68-75 Nm)
75-80 ft. lb.
(102-109 Nm)
100-110 ft. lb.
(136-149 Nm)
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