User Manual

SECTION 2 - PROCEDURES
3120884 – JLG Lift – 2-13
17. Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLI NDER ROD, HEAD, A ND PISTON. AVOID PU LLING 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 t he piston loading o-ring
and seal ring are not damaged or dislodged.
19. Continue pushing the rod into the barrel u ntil the cyl-
inder head gland can be inserted into the barrel cyl-
ind er.
20. Secure the cylinder head gland using the washer
ring and socket head bolts.
21. After the cylinder has been reassembled, the rod
should be pushed all the w ay in (fully retra cted) pri or
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 2-3, Holding Valve Torque
Specifications).
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 OVERHE AD HOIST, FORK-LIFT, OR O THER
MEANS TO SUPPORT THE OVERHANGING WEIGHT OF THE
EXTENDING ROD.
Figure 2-15. Rod Assembly Installation
Table 2-1.Cylin d er Head and Tapered Bushing Torque
Specifications
Description
Head T orque V alue
(Wet )
Tapered Bushing
Torque Value (Wet)
E.A.R. Cyl i nder
30 ft. lbs
(41 Nm)
5 ft. lbs.
(7 Nm)
Level Cylinder (M45AJ)
30 ft. lbs
(41 Nm)
5 ft. lbs.
(7 Nm)
Master Cylinder
(M45AJ)
30 ft. lbs.
(41 Nm)
5 ft. lbs.
(7 Nm)
Table 2-2. Cylinder Piston Nut Torque Specifications)
Description
Nut Torque
Valve (Wet)
Setscrew
Torque V alu e
(Dry)
Upper
Lift Cylinder
200 ft. lbs.
(270 Nm)
100 in. lbs.
(11 Nm)
Mid
Lift Cylinder
400 ft. lbs.
(542 Nm)
100 in. lbs.
(11 Nm)
Lower
Lift Cylinder
400 ft. lbs.
(542 Nm)
100 in. lbs.
(11 Nm)
Level Cylinder (M45 A) 80 ft. lbs.
(108 Nm)
100 in. lbs.
(11 Nm)
Master Cylinder
(M45A)
80 ft. lbs.
(108 Nm)
100 in. lbs.
(11 Nm)
Ta b l e 2 - 3 . Holding Valve To rque Specifications
Description To r q u e Val u e
SUN - 7/8 HEX M20 X 1.5 THDS. 30-35 ft. lbs.
(41-48 Nm)
SUN - 1 1/8 HEX 1 -14 UNS THDS. 45-50 ft. lbs.
(61-68 Nm)
SUN - 1 1/4 HEX M36 X 2 THDS. 150-160 ft. lbs.
(204-217 Nm)
RACINE - 1 1/8 HEX 1 1/16 - 12 THDS. 50-55 ft. lbs.
(68-75 Nm)
RACINE - 1 3/8 HEX 1 3/16 - 12 THDS. 75-80 ft. lbs.
(102-109 Nm)
RACINE - 1 7/8 HEX 1 5/8 - 12 THDS. 100-110 ft. lbs.
(136-149 Nm)