direction as steering
to
be actuated. This
will
restrict
or
completely
shut
off
oil
flow through
port
(l),
and pressure
will
rise both in major and
minor
chambers
(E
and
H).
Pressure
will
prevail
in major chamber where
piston
head is larger in
diameter, forcing
piston
to
extend cylinder rod
(9).
Forward
motion
of
piston
(43)
and cylinder
rod
(9)
will
stop as soon as lessening
of
load ex-
ercised on front ball-head pin
(17),
allows
reac-
tion spring
(36)
to
bring valve back
to
neutral.
CYLINDER DISASSEMBLY (UTB)
FRONT
END
OF
CYLINDER
(MAJOR
DISASSEMBL Y(FIG. C.l/3)
1.
Remove attaching brackets, tubing and con-
nections. Drain residual
oil
by
tilting.
Straighten tabs, take
out
bolts. Remove
cylinder head
(20)
and retaining ring
(19).
CAUTION-Spring
tension is released when
retaining ring is removed. Be cautious
of
spring loaded parts.
2.
Remove front ball stud cap
(23)
and take
out
Belleville spring
discs
(18).
Take retainer, cap
and
"0"
ring from round hole and
lift
out
cylinder control ball stud
(17).
Release con-
trol head clamp
(29)
and screw
out
control
valve assembly.
Make sure oil
inlet
connection is completely
removed from side
of
cylinder. Straighten tab
of
safety plate
(34)
and screw
off
cylinder
front end
lock nut
(33).
Tap cylinder front end
(38)
inward
for clearance, and with small punch through 1/8
inch hole found
on
rim
of
cylinder, remove retain-
ing ring
(13).
Grasp
cylinder
rod and twist, pulling
outward
to
remove
it
and
cylinder
front end
(38).
Should extra resistance be encountered when
piston
(43)
butts
against inside
of
cylinder front
end
(38),
bolt
up in
clamp
(29)
and tap
gently
against
it
with
soft
metal hammer while
twisting
and drawing on
piston
rod. Entire
piston
and rod
assembly
will
slide
out
front
of
cylinder. Loosen
and remove
clamp
(29,
Fig. C.l/3). Slide cylinder
front end
(38)
off
rod
(9).
NOTE: Cylinder sleeve and
minor
pressure end
assembly remain intact, and seldom need further
disassembly. Clean interior
with
solvent and in-
spect
for
loose discharge tube
(40),
for
damage
or scoring. Should seal
(5)
be deteriorated, and
oil seeps from area
of
lock
nut
(46),
replace seal
as outlined under Disassembly and Assembly
of
Minor-Pressure End
of
Cylinder.
DISASSEMBLY
AND
ASSEMBLY
OF
MINOR-PRESSURE
END OF CYLINDER
Straighten tab
of
safety plate
(3,
Fig. C.l/3) and
back
off
cylinder head
lock
nut. Push minor
pressure chamber
(1)
inward
to
clear, and with
small punch through 1/8-inch hole found on rim
of
cylinder, remove retaining ring
(45).
Pull
chamber
(1)
from cylinder. Tap gently
with
soft-
metal hammer
if
necessary.
Clean interior surfaces in solvent, examine for
any irregularity in cylinder
or
return tube
(40).
Replace
or
repair any damaged part.
"0"
ring
(5)
is only seal involved. Upon
its
replacement,
this
end
of
cylinder may be reassembled by reversing
steps in previous paragraph, but leave nut
(46)
finger-tight
for
installation alignment.
DISASSEMBLY AND ASSEMBLY OF CONTROL
VALVE GROUP
Take
out
inside ball stud cap
(23,
Fig. C.l/3) to
allow access
to
retaining
nut
holding reaction
piston abutment
(24).
Grip control valve rod in .
vise and with appropriate tool, or carefully
with
small snub-nosed punch, remove retaining nut.
Withdraw through ball stud end:
-washer;
-ball
stud seat
(22);
-reaction
piston abutment
(24).
Withdraw control valve rod
(37)
with reaction spr-
ing
(36)
and spring seat
(35)
from
other
end
of
control head body
(21).
Seat
(35)
and spring
(36)
are loose on rod
(37)
and may lodge in body
(21),
but are easily removed.
NOTE: Due
to
vast number
of
small parts in total
steering
cylinder,
repair
and
immediate
reassembly
of
head body
is
recommended
before repairing
other
sub-assemblies.
Remove retainer ring
(25)
from I.D.
of
body
(21).
Pull
out
reaction piston
(27)
and shake
out
spring
(30).
Take out all
"0"
ring seals, wash parts in
solvent. Inspect all working surfaces
for
damage
or
excessive wear. Examine spring for fatigue.
Repair, polish
or
replace as necessary.
'
Install
all
new
seal
replacements
before
reassembly.
Insert reaction spring
(30)
and piston
(27).
Clamp
against spring tension and reinstall retainer
(25).
A
CAUTION-During
reassembly take special
care
not
to
damage
"0"
rings.
Inspect spring
for
fatigue. Examine threads on
rod
(37)
and retaining nut. Nut must screw on rod
freely. Slip spring
(36)
and seat
(35)
(flange
against spring)
onto
rod
(37).
Insert
into
head
body
(21).
Slide in seat
(22)
and piston abutment.
Push and hold body
(21)
against springs on rod
(37).
Install washer and retaining nut. Tighten
securely.
Hydraulics · 175
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