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196
OPERATION
No.
ID
39 1 - 6 : Overhauliq
a
pressure re~ulutor
ID
19
1
2
3
4
7
DISMANTLING
(see
Pl.
85)
Disconnect
the
accumulator
(strap
wrench
2223-T,
see
P1.87,
fig.
1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strap
wrench
2223-T
Disengage
the
piston
(2).
Remove
the
retaining
plate
(3)
of
the
valve
ball
(4).
Do
not
mislay
the
shim
or
shims
(1)
found
under
the
plate.
Withdraw
the
ball.
Remove
the
bleed-screw
(5)
and
remove
the
ball
(6).
Remove
the
cap
(7).
Screw
the
retaining
spindle
(A)
in
the
threaded
bore
provided
for
the
union
of
the
connecting
pipe.
Hold
the
regulator
immobile,
if necessary
by
means
of
an
extension
on
the
spindle
(A),
braced
against
the
frame
of the
press.
Fit
the
spanner
(B)
on the
cap
and
keep
it
in
position
with
the
aid
of
the
press
(the
cap
is tightened
to
72 ft.lbs
(10
m.kg).
Undo
the
cap.
Considerable
force
is
exerted
on
the
latter
by
the
spring
(8).
Compensate
this
thrust
by
using
the
press..
While
unscrewing
the
cap
ease
off
the
press
in
order
to
avoid
any
strain
on
the
thread
(the
spanner
and
spindle
assembly
is
sold
under
No.
2224-T,
see
P1.87,
fig.2).
NOTE
-
This
measure
is
essential
to
avoid
stripping
the
last
few
threads.
Remove
the
adjusting
washers
(9),
the
spring
(8)
and
the
thrust
cup
(10)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove
the
cap
seal
(ll),
the
accumulator
gasket,
the
ring
seal
(12)
from
the
bleed
screw
and
the
ring
seal
(13)
from
the
piston.
Clean
the
parts
in
alcohol.
Dry
in
a jet
of
compressed
air.
ASSEMBLY
(see
Pl.
85)
To
prepare
the
body
of the
control
valve.
1.
To
remake
the
seating
for
the
ball
(4)
on
the
non-return
valve
seat.
4
Place
the
body
upright
on
a wooden
board.
Place
a ball
that
is
ingood
conditionon
the
seat.
.I
b)
Make
a good
seat
by
tapping
on
the
ball
with
a hammer
and
a drift.
Remove
the
ball.
This
must
not
be
re-used.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
To
remake
the
seating
for
the
ball
(6)
on
the
seat
"c"
of
the
bleed
screw:
Plac'e
a ball
that
is
in
good
condition
on
the
seat.
Make
a seating
by
Zightly
tapping
on
the
ball
with
a hammer
and
a drift.
Remove
the
ball.
Thismustnotbe
re-used
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.
With
a small
scraper
remove
any
burrs
round
the
hole
provided
for
the
fixing
screw
of
the
plate
(3).
TOOLS
Spanner
and
spindle
2224-T
Drift
5 mm
dia.
x 60 mm
long
Drift
10 mm
dia.
x
120
mm
long
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