.
Regulator
Lock-off
Adjustment
The
regulator
lock-off
setting
is
used
to
set the valve
opening pressure. The lock-off can be checked and
adjusted as follows:
1.
Connect the regulator inlet (Figure
2)
to a source
of
air pressure regulated to
6
02.
(1
1
inches of water
column).
2.
Connect
a“T”
in
the balance line hose and connect
one leg of the
“T”
to an incline monometer that
reads from
0
to2 inches
of
water column. Connect a
hose to the other side of the
“T”.
3.
Put a soap bubble over the outlet opening of the
regulator. Lightly blow into the hose connected to
the
“T”
in the balance line. Slowly apply pressure
until the soap bubble continues to grow because of
air flowing through the regulator. Approximately
0.25
to
0.35
inchesof water column should causeair
to flow through the regulator. (When air is first blown
into the balance line the soap bubble may enlarge
due
to
diaphragm movement, this is not an indica-
tion that air is flowing through the regulator.
4.
If
more than
0.35
inches of water column pressure is
required
to
induce flow, loosen the lock nut on the
1
/4-28
lock-off adjusting screw, back out the screw
until air will flow in the
0.25
to
0.35
water column
pressure range.
If
air flows through the regulator
without any pressure being applied to the balance
line, the lock off adjustment screw must be turned in
to
increase spring pressure. When the proper set-
ting
is
achieved, hold the lock
off
adjusting screw in
position and tighten the locking nut. If adjustments
do not resolve problems see step
5.
5.
If
the inlet pressure is
too
high or
if
there is dirt on the
regulator inlet seat, the regulator will flow air even
though the adjusting screw is turned all the way in.
The regulatorshould not bedisassembled or repairs
attempted by anyone except the equipment manu-
facturer’s factory trained service technicians.
Fuel Solenoid Valve
The fuel solenoid valve (Figure
6-19)
provides a
positive fuel shutoff whenever the generator set
is
stopped. The solenoid must be energized before
fuel will flow
to
the regulator. Service is limited to
replacing the complete valve assembly
if
it
does not
operate properly. The fuel solenoid can be bench
tested by connecting battery positive
(B+)
to
the top
terminal and battery negative
(B-)
to
the grounded
terminal. The plunger assembly should withdraw
and open the valve when the solenoid is energized.
Replace the solenoid valve if
it
does not operate
properly.
I
I
U
FS-1850
FIGURE
6-19.
FUEL
SOLENOID
VALVE
6-1
9
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