JLG E300 Service Manual - Manual (Page 102)

SECTION 5 - HYDRAULICS
5-6 – JLG Lift – 3120772
5. Mark cylinder head and barrel with a center punch
for easy realignment. Using an allen wrench, loosen
the cylinder head retainer cap screws, and remove
cap screws from cylinder barrel.
NOTE: Steps 6 applies only to the lower lift and telescope
cylinders.
6. Using a spanner wrench, loosen the end cap or
head retainer, and remove from cylinder barrel.
7. Attach a suitable pulling device to the cylinder rod
port block end or cylinder rod end, as applicable.
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. Loosen and remove the cap screw(s), if applicable,
which attach the tapered bushing to the piston.
11. Insert the cap screw(s) in the threaded holes in the
outer piece of the tapered bushing. Progressively
tighten the cap screw(s) until the bushing is loose
on the piston.
12. Remove the bushing from the piston.
13. Screw the piston CCW, by hand, and remove the
piston from cylinder rod.
14. Remove and discard the piston o-rings, seal rings,
and backup rings.
15. Remove piston spacer, if applicable, from the rod.
16. Remove the rod from the holding fixture. Remove
the cylinder head gland and retainer plate, if applica-
ble. Discard the o-rings, back-up rings, rod seals,
and wiper seals.
Figure 5-2. Cylinder Barrel Support
Figure 5-3. Capscrew Removal
Figure 5-4. Cylinder Rod Support
Figure 5-5. Tapered Bushing Removal