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4 OPERATION
N MA. 390-0 :
(Irki,,
/h bdrau1ic
(OmOne,its On the #ehide
Mannal
sleering rehicies
)
.
rrÅ:,
-
9. Checking pressure switck (1)
Test
procedure is
the same as for checking
brake control.
Tum engine to
obtain
cut-out pressure.
Stop
engine.
Operate brake
pedal
until
the hydraulic
pressure
warning lamp
remairis n.
Atthat point,
read off pressure
on pressure
gauge.
This should
be
between
75
ond
95
bars (1088 to.
1378 psi
),
inciusive.
If
not
chanqe the
pressure
switch.
10.
Checking
the (ront suspension
Slacken
pressure regulator bleed screw
Remove plug
E and connect front
suspension
supply
pipe
(2) to
safety valve.
Tighten pressure
regulator bleed
screw.
Start
engine.
Put munual height
control
in
normal rzInnnii' position.
Wait until
the
front
end of
vehicle
rises and cut-
out
takes
place.
Allow pressure
to
stabilize.
Stop
engine.
Examine
pressure
gauge
and note
pressure drop
during a period of
3 minutes. tf it
exceeds
10 bars
(145 psi),
check
once
more.
If the result is confirmed
check the
following
components to determine
which
one
is
leaking
-
either the
front corrector
- om
the suspension cylinders (one or
both
).
Testing
the 3
components
should
be
carried out by
eliminating each
ene
in tum.
a)
les
ting
the front
height rorreclor
Loosen
pressure regulator bleed
screw.
Put manual control in
low
position.
Disconnect supply pipe (3) for
front cylinders
from
3-way
union
(4).
Plug tube (3) using
plug
D
(
female
).
T.ighten pressure regulator
bleed screw.
Place
manual
height
control in
normal ,unnin,
position.
Start
engine.
Allow
pressure to
stabilize.
Stop
engine.
Read
off
pressure drop on
pressure
gauge.
If this
drop
in pressume is
greater than
10 bars
(145
psi
)
during a
period of 3
minutes
repeat
test.
If the result
is confirmed, th
front height
corrector
is
defective
: change it.
Remove
plug and connect pipe (3)
to 3way
union (4).
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