16. Clean all surfaces of the low-pressure cylinder and
inspect for any signs of damage or fatigue.
WARNING
Do not reassemble the intensifier with a
cylinder that has a damaged inner surface.
Inspect the inner diameter by looking through the
cylinder angled toward a brightly lit white surface. If
you see any damage, discard the cylinder.
17. Inspect the sealing surfaces for roughness or
damage. There can be no nicks or scratches on these
surfaces. If the cylinder is free from damage, set it
aside and cover with a lint-free cloth.
CAUTION
Sharp burrs on the beveled edge of the cylinder ID
can damage the end bell o-ring and backup ring
during reassembly. Such damage can lead to immediate
seal failure and excessive hydraulic oil loss.
18. Inspect the piston and plunger for damage.
•
If the piston or plunger need to be replaced, or the
plunger has excessive lateral movement with re-
spect to the piston biscuit (more than 1/8 in. off
center line), disassemble the piston and plunger.
•
Continue with Step 19
•
If there is no noticeable damage, apply clean hy-
draulic oil or Parker Super O-Ring Lube (200006)
to the head of the plunger, turn the plunger into
the counterbore in the piston biscuit, using a soft
mallet if needed. Make sure the T-seals do not get
nicked or rolled.
•
Proceed to Step 29,
Reassembling the
intensifier
19. Remove the snap ring and retainer.
Note:
Blow air down between the plunger and the
retainer bore to loosen the retainer.
20. Remove the plunger by hand.
•
Repeat Steps 19 and 20 for the other plunger. Set
the plungers aside.
21. Clean the piston assembly, removing oil, dirt and
burrs from all surfaces.
CAUTION
Inspect the plungers carefully. Scratches, pits or nicks
will cause premature high-pressure seal failure.
Plungers cannot be reworked—they must be replaced.
a.
Lubricate the T-seals and backup rings with
Parker Super O-Ring Lube (200006).
b. Place two backup rings and one T-seal in each
piston groove. The T-seal must be in the middle
of the two backup rings.
Note
: Stagger the joints on the backup rings as shown
to ensure correct installation (see illustration at top of
Page 30).
© Flow International Corporation
M-310 | 29
ESL Intensifier
