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9-7.3. Full Free Lift.
NOTE: Removal procedures are covered in
TION
8.
CAUTION:
To prevent cylinder damage, use proper
pipe clamp vise. The cylinder will be dis-
torted if the vise is tightened too much.
1.
Secure lift cylinder weldment (1,
vise and remove the snap ring retainer (3) and
square head pipe plug (2).
2.
Pull outward on the cylinder base (9) until wear
ring (14) contacts the cylinder base. Continued
pulling will bring the cylinder head (4) out of the
tube.
3.
Use a strap wrench to hold the cylinder rod (13)
and unscrew cylinder base (9) from cylinder rod.
Remove cylinder head (4) from cylinder rod.
CAUTION:
As cylinder rod (13) is pulled out of cylin-
der tube, catch the two halves of wear
ring (14) which will be freed and may fall
and be damaged.
4.
The cylinder rod (13) may now be pulled out of the
tube. Support it carefully and catch the two halves
of the wear ring (14) as they are free. Continue to
pull on the cylinder rod until the piston (12) is out
of the tube.
5.
If piston is worn or damaged hold the cylinder rod
(13) with a strap wrench and take off Flexloc lock
nut (11). Pull piston free of the rod.
6.
Examine bore of center cylinder tube of the cylin-
der assembly (1), and surfaces of the cylinder rod
(13), piston (12), and wear ring halves (14).
Replace all unsatisfactory parts and proceed with
the following steps:
a.
Remove hydraulic cylinder wiper ring (7) and
"U"-cup rod seal (8) from inside of cylinder
head (4), and "O" ring (5) and back-up ring
(6) from outside of cylinder head.
b.
Clean and dry all parts.
c.
Discard all used "O" rings and seals and
replace them with new ones during reassem-
bly.
d.
Coat all new "O" rings and seals with hydrau-
lic fluid during reassembly.
9-10
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7.
Assemble FFL center cylinder by reversing the
disassembly procedure. For ease of assembly
SEC-
when assembling threaded parts, apply a coating
of white lead replacement to the threads--except
for the threads of the cylinder base (9) which are
to be coated with Loctite 222 adhesive (24).
8.
If either or both of the outer cylinders of FFL cylin-
der assembly must be repaired, proceed as fol-
Figure
9-9) in
lows:
CAUTION:
a.
b.
c.
d.
e.
f.
g.
CAUTION:
As cylinder rod of either outer cylinder is
pulled out of cylinder tube, the two
halves of wear ring (22) may fall free and
be damaged hitting the floor. Be sure to
catch these pieces.
Remove snap ring retainer (15).
Pull outward on the cylinder rod (23) until
wear ring (22) pushes cylinder head (16) out
of cylinder tube.
A little more pulling will release the halves of
the wear ring.
Catch these pieces for reuse if in good condi-
tions.
Carefully support cylinder rod (23) and pull it
outward to free it and piston (20) from the
tube. If the piston is worn or damaged, or to
replace "O" ring (21), hold the rod with a
strap wrench and remove Flexloc lock nut
(11) and pull piston free of rod.
Examine
bore
of
cylinder
repaired, surface of cylinder rod (23) and
wear ring halves (22) for scoring, scratching,
or other damage.
Replace all unsatisfactory parts and proceed
with the following steps:
(1) Remove and discard "O" ring (21) and
"U" cup seal (19).
(2) Clean all parts and replace all "O" rings
and seals during reassembly.
Reassembly of the lift cylinder requires
the use of special tool, part number
900931, to prevent damage to cylinder
packing.
(3) Insert special tool part number 900931,
into the end of the cylinder, as shown in
Figure 9-9
(inset).
tube
being
PDI0404
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