JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 102)

SECTION 5 - HYDRAULICS
5-10 – JLG Lift – 3120271
NOTE: Step 4 applies only to the Telescope Cylinder.
4. Remove the nuts which attach each cylinder rod
support block pull rod and withdraw the rods from
the forward end of the telescope cylinder.
5. Place the cylinder barrel into a suitable holding fix-
ture. Tap around the outside of the cylinder head
retainer with a suitable hammer to shatter the loctite
seal.
6. Using a suitable spanner wrench, loosen the cylin-
der head retainer, if applicable, and/or cylinder head
gland, and remove from cylinder barrel.
7. Attach a suitable pulling device to the cylinder rod
port block end or cylinder rod end, as applicable.
IMPORTANT
EXTREME CARE SHOULD BE TAKEN WHEN REMOVING THE CYL-
INDER ROD, HEAD, AND PISTON. AVOID PULLING THE ROD OFF-
CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON AND
CYLINDER BARREL SURFACES.
8. With the barrel clamped securely, apply pressure to
the rod pulling device and carefully withdraw the
complete rod assembly from the cylinder barrel.
9. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to the piston
as possible.
10. Remove the setscrew(s), if applicable, and nut which
attach the piston to the rod, and remove the piston.
Discard self-locking set screws.
11. Remove the piston rings.
12. Remove and discard the piston o-rings, seal rings,
and backup rings.
13. Remove the setscrew, if applicable, piston spacer,
and wear ring, if applicable, from the rod.
14. Remove the rod from the holding fixture. Remove
the cylinder head gland and retainer, if applicable.
Discard the o-rings, back-up rings, rod seals, and
wiper seals.
Figure 5-7. Cylinder Barrel Support
Figure 5-8. Cylinder Rod Support