Service
Elements should be changed at 8
to 15 inches of vacuum (inHg).
(See
Accessories
Section
for
Gauges.) Measurement should be
made between the Racor unit and
the fuel pump.
On '75/ and '79/Series models with
valving, all valves are in the open
position for normal operation. For
continuous operation, one unit may
be shut down while under power to
change
element.
During
the
element change, reduce fuel flow
rate to 6 gpm for 79 model or to 3
gpm for 75 model. Below Filter
Fuel Storage Application
1. Shut off engine. Remove lid.
2. Inspect gaskets. Replace only
if necessary with Racor Marine
Gaskets.
3. Remove element.
4. Insert Racor replacement
element over center return tube
with turning motion. (See Parts
Diagram
for
correct
element
number.)
5. Top off by pouring clean diesel
fuel into filter cylinder until full.
6. Lubricate lid gasket and T-
handle O-ring. Replace lid and
hand-tighten T-handle. Carefully
clean any accumulation of diesel
fuel from the metal deflector bowl.
The bowl must be drained before
water or contaminants reach the
bottom of the centrifuge assembly.
CAUTION:
To
insure
safety, use only plated
steel fittings and genuine
Racor
replacement
elements and parts.
Above
Filter
Fuel
Storage
Application
When' replacing element(s) on a
500MA,
900MA,
1000MA,
73/1000MA or 77/1000MA with the
engine not in operation.
1. Turn valve "A" off. (See Figure
2.)
2. Remove lid and T-handle.
Inspect gaskets. Replace only if
necessary
with
Racor
Marine
Gaskets.
3. Remove element(s) by means
of bail.
4. Insert Racor replacement
element over center return tube
with turning motion. (See Parts
Diagram
for
correct
element
number.)
5. Top off by pouring clean diesel
fuel into filter cylinder until full.
6. Lubricate lid gasket and T-
handle O-ring. Replace lid and
hand-tighten T-handle.
Carefully clean any diesel fuel from
the metal deflector bowl.
7. Open valve "A" and inspect for
leaks.
When replacing one filter while
another
is
in
service
on
a
75/900MA,
75/1000MA,
or
79/1000MA with the engine in
operation:
1. Check outlet gauge. If gauge
reads 4 or more inches of vacuum
(inHg) close the outlet valve of the
unit to be serviced, (See Figure 3.)
2. Follow Steps 2-6 for Above
Ground Fuel Storage Application.
3. If outlet gauge reads less than
2 inches of vacuum or reads
pressure, slowly close valve "B"
until outlet gauge reads 2-4 inches
of vacuum.
4. Close the outlet valve of the
unit to be serviced.
5. Follow steps 2-7 for Above
Ground Fuel Storage Application.
Maintenance
and
Trouble-
Shooting Procedures
New
Elements-Normal
vacuum reading can be 1 to 5 inHg
at full governed RPM, depending
on the hose l.D., length, elbows,
pump efficiency, and height of lift
from tank. Idle RPM should be
near
"O"
reading
with
clean
element where pump capacity is
dictated by engine RPM. If
vacuum reading does not return to
1 to 5 inHg after element change,
check for the following:
1. collapsed fuel lines
2. tank shut-off valves closed
3. plugged fuel lines
If the inlet
to
the
Racor
Filter/Separator
is
plugged,
disconnect inlet line, open drain
petcock,
and
blow
out
with
compressed air. In case of severe
stoppages,
remove
bowl
and
centrifuge unit and clean with
compressed air.
If air bubbles are rising from
centrifuge action in the clear bowl,
the air leak is between inlet side of
the Racor system and tank. Check
for:
1. loose fittings
2. pin holes in lines
3. cracked tank stand pipe
4. out of fuel condition
5. O-ring not seating
6. improper flare angles on hose
fittings.
If no bubbles are noted in bowl
and air suction is still evident,
examine outlet side of the Racor
system to fuel pump. Check for.
1. loose fittings
2. pin holes in line
3. O-ring not seating
4. improper flare angles on hose
fittings
5. fuel pump seats
6. bleed-off fitting on top of
Cummins fuel pump
7.
top
gaskets
on
Racor
Filter/Separator
*(For example, a 37º flared
female hose fitting pulled up tightly
to a 45 ° male fitting sometimes
causes a hair line crack, resulting
in air suction.)
If Racor Filter/Separator is
sucking air at bowl drain fitting
gasket or T-handle and top, and
cannot be stopped by wetting
gasket
with
fuel
and
hand
tightening only, replace gasket.
NOTE: Methanol, ethanol and
alcohol based additives will
cause damage to non-metal
parts in the Racor unit and the
entire engine system. When use
of an additive is determined to
be necessary, use only genuine
RACOR
DIESEL
FUEL
ADDITIVES. RACOR DIESEL
FUEL
ADDITIVES
provide
preventive
maintenance
protection all year long, help
cold
weather
starts,
protect
against
damaging
foulants,
extend
element
life
and
maximize the efficiency of fuel
fitters and water separators.
Bleed Back - If fuel in the
filter/separator bleeds back to the
tank an air leak or check valve
seating problem is indicated. To
inspect check valve seat, remove
bowl
ring,
bowl
and
turbine
centrifuge,
turning
counter-
clockwise. (See parts diagram for
identification of parts.)
Inspect check ball and seat.
Clean or replace seat and check
ball and lubricate seat and reinstall
centrifuge hand tight. Replace
bowl ring gasket and reinstall bowl
and ring. Fill unit with fuel.
Read
and
follow
the
Installation instructions carefully to
insure proper performance of your
Racor filter/separator.
Optional Accessories
Racor
Part No. Description
1606B
Vacuum
Gauge
Kit
(includes 0 to 15 inHg gauge and
fittings necessary for installation)
18-1104
Compound Pressure/Vacuum
Gauge
11619
Manual Valve-t" NPT (See Fig.
2)
18351
Manual Valve-l" NPT (See
Fig. 3)
18099
Pipe Tee-1" x 1" x t" NPT (See
Fig. 3)