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ID
19
OPERATION
No.
ID
39 3- 3
: Overhauling
a pressure distribution
block
Op.
ID
393-3
203
DISMANTLING
(see
Pl.
85,
fig.
4).
I
1
Remove
the
plug
(17).
Remove
the
spring
(18)
and
the
ball
(19).
Remove
the
piston
(20)
by
tapping
the
block
lightly
on
a piece
of wood
or
eject
it
by
means
of
a stream
of compressed
air
injected
through
the
centre
hole
after
the
endholes
have
beenblocked
. . . . . . . . . . . . . . . . . . . . . . . . . ..-.............
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Remove
the
plug
(21)
and
proceed
in
the
same
manner
as
above.
4
3
Remove
the
seals
(22)
from
the
plugs.
I
ASSEMBLY
(see
Pl.
85,
fig.
4).
Reseat
the
balls
on
their
seatings.
Make
an
imprint
using
a ball
in
good
condition
by
gently
tapping
the
ball
with
a
hammer
and
a rod.
Clean
the
body
of
the
distribution
block.
Do
not
reuse
the
ball
after
this
operation
. . . . . . .
One
one
side
of
the
block
place:
a piston
(20)
( see
illustration
for
position
of
the
hole
"fll),
a new
ball
(19),
the
spring
(18),
and
the
plug
(17)
complete
with
seal
(22)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Proceed
in
the
same
way
for
the
other
side
of the
block.
Make
sure
that
the
piston
(20)
is
fitted
correctly.
8
Bench
test
the
pressure
distribution
block
(see
Op.
ID
393-O).
23
mm
spanner
Rod:
10 mm
dia.
Length
= 100
mm
23 mm
spanner
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