-
DISASSEMBLY AND ASSEMBLY OF CYLINDER
ROD
Major
disassembly
of
piston
from rod
is
not
necessary except when piston, valve body,
and/or cylinder rod
must
be serviced
or
replaced.
Inspect wearing surfaces. If satisfactory,
omit
further
instructions
to
and including next CAU-
TION note.
To disassemble, remove bronze seal ring
with
ring tool. Take care not
to
damage edges
if
reusable.
Straighten tab
of
safety plate
(8,
Fig. C.l/3).
Clamp cylinder rod
(9)
in well-padded vise,
or
bet-
ter,
enlist
aid
of
assistant
to
hold rod on a
smooth, clean wood surface. Use a punch
against spanner
notch
-strike
sharply
to
loosen.
Unscrew valve body
(41)
with
piston
(43)
from rod
(9).
Slide
off
safety plate
(8)
and washer
(42).
Use arbor press to remove piston
(43)
from valve
body
(41).
To reassemble piston, valve body and rod,
reverse disassembly procedure.
A
CAUTION-
Take care not
to
lose piston
alignment-pin lodged in valve body.
Remove snap ring inside valve body. Take
out
seal retainer, seal
(4)
and washer. Inner snap-ring
may stay. Clean in solvent, inspect, replace with
new seal
(4)
and reassemble by reversing
disassembly procedure.
SERVICE OF FRONT END BODY
(38)
Through small hole in rim
of
body, release
re-
tainer
(31,
Fig. C.l/3), take
out
mud-scraper
(32)
and
"0"
ring
(15).
Remove
"0"
ring
(12).
Discard
all old rubber parts. Wash body
(38)
in solvent.
Inspect bronze bushing for scoring or excessive
wear and replace
if
necessary.
To reassemble, replace
"0"
rings and mud-
scraper
with
new, and reverse disassembly pro-
cedure.
INSTALLING CYLINDER
ROD
AND PISTON
ASSEMBLY
NOTE:
Following
instructions
deal
with
assembly
into
front
of
cylinder only, since rear,
low-pressure end assembly
is
covered under
Disassembly and Assembly
of
Minor-Pressure
End
of
Cylinder.
With
clamp
(29,
Fig. C.l/3) removed, slide front
end body
(38)
onto
cylinder rod assembly
with
threaded end away from piston. Install piston
ring
(7).
Lubricate discharge tube
(40)
inside cylinders
and seal
(4)
liberally. Insert cylinder rod and front
end body (piston-end first)
into
cylinder opening.
Compress ring for entry. Carefully maintain
lateral alignment by sliding front end body
against piston and
into
cylinder immediately
following
it. Twist cylinder rod assembly as
it
is
gently
eased inward.
A
CAUTION-Do
not
force. If resistance is en-
countered, oil seal
(4)
may be catching on
discharge tube
(40)
and damage result.
Retract rod a
little
and try again. When rod is
5
or
6-inches
into
cylinder, oil seal
(4)
is past
danger point and should slide in easily.
Tap cylinder front end
(38)
below edge
of
cylinder
and reinstall retaining ring
(13).
Make sure ring is
seated and withdraw cylinder rod
to
limit. This
forces front end
(38)
against retainer
(13).
Carefully use spanner in safety plate key-way
of
cylinder end
(38)
so threads
will
not be damaged,
and turn until threaded hole for delivery tube
connection aligns with hole in rim
of
cylinder.
Lightly
screw in connector
to
maintain align-
ment. Install safety plate
(34)
and lock
nut
(33);
draw up
tightly
and set tab
of
plate
(34).
INSTALLING CONTROL VALVE
ROD
AND HEAD
BODY ASSEMBLY
Install inner ball stud cap
(23,
Fig. C.l/3). Turn ball
stud seat so round holes align, slotted holes
align, and insert ball stud
(17),
thread-end first,
through round hole. Push in outer ball stud cap
(23)
and Belleville
discs
(18)
(maintaining alter-
nate cover-concave order) and washer.
NOTE: Installing retaining ring
(19)
against ten·
sion
of
Belleville
discs
(18)
is facilitated by mak-
ing a simple
tool
of
1-inch x
1
14-inch flat steel
about
3112-inch
long
with
two
7
/,.-inch holes
2114
-inch apart. Attach
it
diagonally across head
body'with
two
mounting
screws, a pipe-union
or
small wrench-socket against washer. Tighten
screws
to
compress Belleville
discs
(18)
and
allow
access
to
groove
for
snap ring
(19).
Put snap ring
(19)
in groove. Remove
"tool",
if
us-
ed.
Install in order:
"0"
ring, plug and snap ring in
round hole.
INSTALLING VALVE
ROD
AND HEAD BODY
ASSEMBLY
Extend cylinder rod
(9,
Fig. C.l/3) to limit. Loosen
clamp
(29).
Insert valve rod and screw head body
Hydraulics-
176
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