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ID
19
OPERATION
No.
ID
39 I- 0 : Checking
the
pressure reserve units
Op.
ID
391-O
183
3
6
b)
There
should
be
no
leakage
of liquid
between
the
end
cap
(1)
and
the
pump
body
unless
the
gasket
(4)
or
the
bearing
face
of the
gasket
on
the
seating
(6)
or
on
the
cap
are
defective
or
if
the
thickness
of the
washer
(5)
is
not
correct
(washer
too
thick)
(see
Pl.
84).
c)
*If
the
pressure
does
not
rise
or
if
the
needle
of the
pressure
gauge
returns
quickly
to
the
zero
reading,
undo
the
bleed
screw
(b)
in
order
to
bleed
the
system.
Retighten
the
bleed
screw
and
operate
the
pumpI
any
impurities
under
the
valve
will
be
removed
by
the
movement
of the
fluid.
Repeat
this
operation
three
or
four
times;
df
the
needle
of the
pressure
gauge
does
not
remain
stationary
the
valve
is
defective.
Undo
the
bleed
screw
"b".
Remove
the
pump.
PRESSURE
CONTROL
VALVE
BENCH
TEST
(See
Pl.
129).
Checking
the
cutting-out
of the
control
valve.
To
carry
out
this-operation,
close
the
orifice
of
the
test
bench
pump
by
means
of the
plug
(V)
. . . . . . . . . . . . . . . . . . . .
Fitaplug
(L)
in
the
place
of the
accumulator,
inserting
a washer.
Connect
the
inlet
aperture
"d"
of the
pressure
control
valve
to
the
aperture
"a"
of the
test
bench
pump
by
means
of
the
pipe
(S).
C onnect
the
outlet
aperture
of
the
pressure
control
valve
to
the
pressure
gauge
(M3),
using
the
pipe (Jb
Make
sure
that
the
bleed
screw
"b"
is
tight;
operate
the
pump
to
raise
the
pressure
until
the
valve
cuts
out.
At
this
moment
the
liquid
"spurts"
from
the
return-to-reservoir
aperture
and
the
lever
of the
pump
can
be
operated
without
effort.
Read
the
maximum
pressure
of
the
cut-out
valve
at
this
very
moment.
Immediately
afterwards
the
needle
of the
pressure
gauge
(M3)
starts
to
move
back
to
"0".
The
needle
of
the
pressure
gauge
(M3)
(130
and
140
kg/cm2).
must
indicate
a maximum
pressure
of
between
1849
p. s.i.
and
1991
p. s.i.
If
the
valve
is
defective,
the
pressure
indicated
by
the
pr@ssure
gauge
(M3)
is not
stable,
the
fluid
flows
out
of
aperture
"f"
and
the
lever
is
hard
to
operate.
L..
NOTE
- If
the
pressure
recorded
is
less
than
the
limits
given
and
there
is no
leakage
(see
following
paragraph),
the
number
of
washers
must
be
increased
or
decreased
(9)
(see
Pl.
85,
fig.
1).
If it
is
impossible
to
effect
a cut-out,
and
it
is found
that
the
fluid
is
flowing
out
of
the
return-to-reservoir
aperture
"f",
the
cut-out
valve
is
defective.
Checking
for
leakage.
After
the
valve
has
cut-out,
read
the
recording
on
the
pressure
gauge
(M3):
there
must
be
no
change
of
position,
if there
is,
the
cut-out
valve
is
defective.
It is
necessary
to
re-seat
the
balls.
TOOLS
Test
bench
2290-T
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