JLG 740A, Service And Maintenance Manual

Page: 295 / 408

SECTION 5 - HYDRAULICS
3121160 – JLG Lift – 5-9
16. Secure the cylinder head gland using the washer
ring and socket head bolts.
17. 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.
18. If applicable, install the cartridge-type holding valve
and fittings in the rod port block, using new o-rings
as applicable.
NOTE: *Steer cylinder spanner nut is tightened as per Spec.
"CYR" Cylinder spanner nut tightening procedure.
Pressurize cylinder on retract to 80/100 psi to push
rod guide firmly against the round retaining ring.
(Apply 1 drop of loctite #242, 2 places, at 180° apart.
Hand tighten nut, then tighten 1/4 turn with spanner
wrench.)
Figure 5-12. Rod Assembly Installation
Table 5-1. Cylinder Torque Specifications
CYLINDER HEAD AND TAPERED BUSHING
TORQUE SPECIFICATIONS
Description
Head
Torque Value
(Wet)
Tapered Bushing
Torque Value
(Wet)
Upper Lift Cylinder 420 ft. lbs. (570 Nm) 60 ft. lbs. (81 Nm)
Lower Lift Cylinder 420 ft. lbs. (570 Nm) 30 ft. lbs. (41 Nm)
Articulating Lift Cyl. 30 ft. lbs. (41 Nm) 5 ft. lbs. (9 Nm)
Articulating Slave
Cylinder (AJ) 50 ft. lbs. (68 Nm) 9 ft.lbs. (12 Nm)
Articulating Master
Cylinder 50 ft. lbs. (68 Nm) 9 ft. lbs. (12 Nm)
Main Boom Tele.Cyl. 30 ft. lbs. (41 Nm) 9 ft. lbs. (12 Nm)
Upright Level Cyl. 275 ft.lbs. (373 Nm) 30 ft. lbs. (41 Nm)
Lockout Cylinder 80 ft. lbs. (109 Nm) 9ft. lbs. (12 Nm)
Slave Cylinder 50 ft. lbs. (68Nm) 9 ft. lbs. (12Nm)
*Steer Cylinder Piston Nut Torque Specifications.
description ft. lbs Nm
Nut, rod 275/330 ft. lbs. 372/447 Nm