JLG 3246E2 Service Manual - Manual (Page 19)

SECTION 2 - PROCEDURES
3120855 – JLG Sizzor – 2-7
7. Using this as a handle, pull out the piston rod and
extend until the piston bottoms out on the head
8. Gently tap the piston against the head to drive the
rod assembly out.
9. Place the rod on a clean surface that will not dam-
age the chrome.
10. Vise - up on the wrench flats on the end of the rod
and remove the piston locknut.
11. Break the piston free and separate from the rod.
12. Slide the spacer and head off the rod from the piston
shoulder end.
Cleaning and Inspection
1. Clean all parts thoroughly in an approved cleaning
solvent.
2. Inspect the cylinder rod for scoring, tapering, ovality,
or other damage. There should be no scratches or
pits deep enough to catch the fingernail. Pits or
scratches that go to the base metal are unaccept-
able. Chrome should be present over the entire sur-
face of the rod. In the event that an unacceptable
condition occurs, the rod should be repaired or
replaced.
3. Visually inspect the inside bore of the head for
scratches or polishing. Deep scratches are unac-
ceptable. If polishing occurs the bore should be
checked for ovality.
4. If ovality occurs it is unacceptable. Check the condi-
tion of the seals looking particularly for metal parti-
cles embedded in the seal surface.
5. Damage to the seal grooves is unacceptable, partic-
ularly on the sealing surfaces. In the event that an
unacceptable condition occurs, the piston should be
replaced.
6. Visually inspect the bore on the inside tube assem-
bly for pits and scratches. There should be no
scratches or pits deep enough to catch the finger-
nail.
7. Inspect threaded portion of barrel for damage. Dress
threads as necessary.
8. Inspect threaded portion of piston for damage.
dress threads as necessary.
9. Inspect seal and o-ring grooves in piston for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
10. Inspect threaded portion of head for damage. Dress
threads as necessary.
11. Inspect seal and o-ring grooves in head for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
12. Inspect cylinder head outside diameter for scoring
or other damage and ovality and tapering. Replace
as necessary.
13. Inspect spacer for burrs and sharp edges. If neces-
sary, dress inside diameter surface with Scotch Brite
or equivalent.
14. If applicable, inspect port block fittings and holding
valve. Replace as necessary.
15. Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
16. If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
Assembly
NOTE: Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used.
Apply a light film of hydraulic oil to all components
prior to assembly.
Figure 2-3. Capscrew Removal
Figure 2-4. Rod Support