JLG 25RTS, Service & Maintenance

Page: 26 / 84

SECTION 2 - PROCEDURES
2-10 – JLG Sizzor – 3120826
1. Place a new wear ring into the inner head diameter
groove and a new o-ring on the outer diameter
groove.
2. Carefully install the head gland on the rod, ensuring
that the wiper and rod seals are not damaged or dis-
lodged. Push the head along the rod to the rod end,
as applicable.
3. Place a new o-ring into the inner piston diameter
groove and a new o-ring and wear ring on the outer
diameter groove
.
4. Carefully slide the piston spacer on the rod. If appli-
cable, align the oil holes in the rod and the spacer.
Secure the spacer, if applicable.
5. Carefully place the piston on the cylinder rod, ensur-
ing that the o-ring is not damaged or dislodged.
6. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to the piston
as possible.
9. Push the piston onto the rod until it abuts the spacer
end and install the attaching nut.
WHEN REBUILDING THE CYLINDERS, APPLY LOCTITE #242 TO
PISTON NUT AND SETSCREW, THEN TORQUE PISTON NUT.
REFER TO TABLE 2-1, CYLINDER PISTON NUT TORQUE SPECIFI-
CATIONS
NOTE: The Steer Cylinder uses snap rings to secure piston.
10. Prior to setscrew installation spot drill rod before
installing the setscrew(s) which secure the piston
attaching nut to the diameter groove.
Figure 2-11. Poly-Pak Seal Installation
Figure 2-12. Wear Seal Installation
Figure 2-13. Piston O-Ring Installation
Table 2-1. Cylinder Piston Nut Torque Specifications
Description
Nut Torque
Value
Setscrew
torque Value
Lift Cylinder 400 ft lb
(542 Nm)
100 in lb
(12 Nm)
Lockout Cylinder N/A N/A
Level Cylinder 50 ft lb
(68 Nm)
100 in lb
(12 Nm)
Steer Cylinder N/A N/A
Table 2-2. Holding Valve Torque Specifications
Description Torque Value
Sun - 7/8 hex M20 x 1.5 thds 30 - 35 ft lb 41 - 48 Nm
Sun - 1-1/8 hex 1 - 14 UNS thds 45 - 50 ft lb 61 - 68 Nm
Sun - 1-1/4 hex M36 x 2 thds 150 - 153 ft lb 204 - 207 Nm
Racine - 1-1/8 hex 1-1/16 - 12 thds 50 - 55 ft lb 68 - 75 Nm
Racine - 1-3/8 hex 1-3/16 - 12 thds 75 - 80 ft lb 102 - 109 Nm
Racine - 1-7/8 hex 1-5/8 - 12 thds 100 - 110 ft lb 136 - 149 Nm