JLG 80HX_HX+6_HXER Service Manual - Manual (Page 41)

SECTION 2 - PROCEDURES
3120863 – JLG Lift – 2-19
NOTE: After torquing piston nut spot drill cylinder rod for set-
screws.
2.10 CYLINDER REMOVAL AND
INSTALLATION
Telescope Cylinder Removal
1. Be sure the boom is fully retracted and in a horizon-
tal position.
2. Shut down the engine. Support the boom basket
end with a prop. (See Figure 2-3.)
3. Remove the boom end-cover.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID THE ENTRY OF
CONTAMINANTS INTO THE SYSTEM.
4. Tag and disconnect the hydraulic lines to the tele-
scope cylinder. Use a suitable container to catch any
residual hydraulic fluid. Cap all hydraulic lines and
ports.
5. Remove the two snap rings that retain the telescope
cylinder pin to the base boom.
6. Using a suitable brass drift, carefully drive the tele-
scope cylinder pin from the base boom.
7. Remove the telescope cylinder trunnion pin covers
from each side of the base boom.
8. Remove the capscrews securing the trunnion pins
from each side of the boom.
9. Using a suitable slide hammer, remove the trunnion
pins attaching the telescope cylinder to the mid
boom.
Table 2-2. Cylinder Piston Nut Torque Specifications
Description
Nut
Torque Value
(Wet)
Setscrew
Torque Value
(Dry)
Lift Cylinder 814 Nm 5 Nm
Slave Cylinder 109 Nm 12 Nm
Master Cylinder 109 Nm 12 Nm
Steer Cylinder 109 Nm 12 Nm
Steer Cylinder
(Oscillating Axle)
380-456 Nm N/A
Lockout Cylinder N/A N/A
Telescope Cylinder 814 Nm 12 Nm
Axle Extension Cyl. 7 Nm 12 Nm
Axle Extension Cyl.
(Oscillating Axle)
138 Nm 12 Nm
Axle Lift Cylinder 553 Nm 12 Nm
Tie-Rod Cylinder
(Oscillating Axle) 210-250 Nm N/A
Extend-A-Reach
Lift Cylinder 271 Nm 12 Nm
Slave Cylinder 271 Nm 12 Nm
Table 2-3.Holding Valve Torque Specification
Description Torque Value
SUN - 7/8 HEX M20 x 1.5 THDS. 41-48 Nm
SUN - 1 1/8 HEX 1-14 UNS THDS. 61-68 Nm
SUN - 1 1/4 HEX M36 x 2 THDS. 204-217 Nm
RACINE - 1 1/8 HEX 1 1/16-12 THDS. 68-75 Nm
RACINE - 1 3/8 HEX 1 3/16-12 THDS. 102-109 Nm
RACINE - 1 7/8 HEX 1 5/8-12 THDS. 136-149 Nm