JLG 600SC_660SJC Service Manual - Manual (Page 269)

SECTION 8 - HYDRAULICS
3121157 – JLG Lift – 8-9
b. Tap each space once; this means the tapered
bushing is tapped 3 times as there are 3 spaces
between the capscrews.
14. Retorque the capscrews evenly and progressively in
rotation to the specified torque value. (See Table 8-
1, Cylinder Head and Tapered Bushing Torque
Specifications.)
15. Remove the cylinder rod from the holding fixture.
16. Place new guide locks and seals in the applicable
outside diameter grooves of the cylinder piston.
(See Figure 8-10.)
17. 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.
18. 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.
19. Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into the barrel cyl-
inder.
20. Secure the cylinder head gland using the washer
ring and socket head bolts. (See Table 8-1.)
21. 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.
22. If applicable, install the cartridge-type holding valve
and fittings in the rod port block, using new o-rings
as applicable. (See Table 8-2, Holding Valve Torque
Specifications).
Figure 8-12. Seating the Tapered Bearing
Table 8-1. Cylinder Head and Tapered Bushing Torque
Specifications.
Description
Head Torque
Value (Wet)
Tapered Bushing
Torque Value
(Wet)
Lift Cylinder 240 ft. lbs.
(325 Nm)
30 ft. lbs.
(41 Nm)
Articulating Lift Cylinder 30 ft. lbs.
(41 Nm)
5 ft. lbs.
(9 Nm)
Slave Cylinder 30 ft. lbs.
(41 Nm)
5 ft. lbs.
(9 Nm)
Master Cylinder 30 ft. lbs.
(41 Nm)
5 ft. lbs.
(9 Nm)
Telescope
Cylinder 50 ft. lbs.
(68 Nm)
9 ft. lbs.
(12 Nm)
Lockout Cylinder 80 ft. lbs.
(109 Nm)
N/A
Articulating Slave Cylin-
der 50 ft. lbs.
(68 Nm)
9 ft. lbs.
(12 Nm)
Articulating
Master Cylinder 50 ft. lbs.
(68 Nm)
9 ft. lbs.
(12 Nm)
Figure 8-13. Rod Assembly Installation