RM – 26-10-7707 Rev.
E
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(a) Removing material ‘smeared’ over the head bolts from high impact damage may be
required to access and remove bolts.
(b) An air hammer is recommended to drive out head dowels.
(2) With the unit standing upright, strike end of shaft with plastic mallet or non-marring
hammer and allow the shaft to push the opposite head/end off.
g) Shaft Removal:
i) Be certain to have addressed all dings and burrs as identified earlier.
ii) Pull the shaft out, with a straight even pull, taking extreme
CAUTION
that the shaft does
not fall and nick the body or damage the journals or ‘A’ diameter of the shaft.
iii) Remove all seals and inspect for cuts, nicks, or any other unusual conditions of the seal.
3)
EVALUATION AND CORRECTIONS
a) Examine oil residue inside actuator. This may give a clue as to why any damage has occurred.
b) Contaminated oil will cause scoring of internal surfaces.
c) Varnish on internal parts can be a sign of hydraulic system running too hot.
d) Metallic particles may originate from valve spools, actuator internal parts and hydraulic system
components.
e) The appearance of any contamination will require flushing and cleaning of the hydraulic
system.
f) Remove shaft seals and closely examine seal grooves for any corrosion, contamination, or
damage.
g) Wash all parts thoroughly and examine for defects.
h) Shaft:
i) Shaft should be thoroughly cleaned of all contamination.
ii) All critical areas of shaft addressed as identified earlier
iii) Care must be taken to not damage the shaft – especially the edge of the ‘A’ diameter and
the shaft journals (see Shaft Diagram).
iv) Cracks:
(1) Examine the vane for cracks on "A" diameter,
keyways, and other areas where stress may be
applied.
(2) Spot check by Magnaflux can be used to check for
cracks. FOLLOW DIRECTIONS ON BACK OF
THE CANS CAREFULLY
.
v) Corrosion:
(1) Rust will likely be present on the shaft at edge of
the outer seal. This area should be lightly
polished in a radial direction to remove the rust.
(2) ANY polishing or clean up performed on the shaft
must be performed in a radial fashion to prevent
linear scratching.
(3) A fine polishing paper or ‘Scotch Brite’ pad of 600 grit or higher can be used.
