Stewart Warner 240 Series User manual

SERVICE INSTRUCTIONS
240 SERIESELECTRICFUELPUMP
6V & 12V Coil Kits
KITNO. 426947 (Fig. 2}
(A) 1-425617 Coil, 6 Volt
(B) 1-425651 Base Gasket
(C) 1-425660Switch Gasket (large)
(D) 1-425655Switch Gasket (small)
(E) 2-425650 Switch Sleeve
(F) 1-432975 Bowl Gasket
KITNO. 426948 (Fig. 2)
(A) 1-425664 Coil, 12 Volt
(B) 1-425651 Base Gasket
(C) 1-425660Switch Gasket (large)
(D) 1-425655SwitchGasket (small)
(E) 2-425650SwitchSleeve
(F) 1-432975BowlGasket
1. Insert coilassembly (A) intopump with notch
In contactplateoppositethat of switch opening.
When coil is properlyindexed and seated, the
terminals andtop of coil will be clearlyvisible
through the switchopening.
2. Replacetensionwasher with the roundedpor-
tion to the coll.
3. Replacenewgasket(B)anduslngtool(T-281843)
screw in coll base until it seats firmly against
gasket.
4. Place "O" ringaroundprotrudingportion of
pistontube.
5. Place washer ontopof"O" ring.
TOPOF COIL
FIGURE 1
6. Installcontact sleeves (E) onto the collter-
minals (Figure 1).
7. Trip actuator armof switchupward (Fig. 3).
8 Insert piston.
9. With finger pressure holdpiston toits upper-
mostposition,then release piston approxi -
mately 1/8". THE PISTON MUST BEIN THIS
POSITION TO INSTALL SWITCH.
f—
/I <MMM
*
FIGURE 2
10. With gaskets (C)and(D)in place, press
switch Into pump body making certain the
switch contactsengagewith the contact
sleeves. Dueto alignment slot on switch, it
can only be installed one way.
11. Replace switch cover and secure. Note:vent
hole in covermustfacedownward.
FIGURE 3
12. Insert powerspringafterpiston and replace
the intake valve. Valvemust be firmly seat-
ed againstwasher. Usea wrench but take
care notto over tighten. Donot seat valve
on coil base. .-. -,
13. After inspection or cleaning of sedimentbowl,
assemble filter as shown in Figure 4. Make
certain that bowl gasket (F)is properly seat-
ed.
14. Checkoperation of pump beforeinstallation
on vehicle.
IMPORTANT: Always usenew gaskets and seal
ringsduring reassembly.
FIGURE 4
Printed in U.S.A.
P.N. 434357
STEUJRRT-UJflRnER CORPORHTIOH
1826 W. DiverseyParkway
Chicago,Illinois60614
SER 4750

ISy m b o 1 of
SERVICE INSTRUCTIONS
Stewart
240 SERIES
ELECTRIC FUEL PUMPS
The Stewart-Warner Model 240 FuelPump is
electrically operated and will deliver a volume in
excess ofany electric fuel pump of comparable
voltage. The fuel pump is available for6,12and
24 volt Installations. The average current con-
sumption is 1.5 amperes, andit is so designed
that no polarity is involved at Installation.
Modelsthathave a pressure regulator are factory
adjusted at4 Ibs. pressure. This pressure is
adequate forthe majority of vehicle installations.
This regulator maintainsboth an adequate pres-
sure at idle withoutflooding the carburetor with
an adequatevolume of fuel under peak load con-
ditions. If more or less pressure is required at
the carburetor, the pressure regulator canbe
adjusted - BUT ONLYAFTER THE PUMP IS
INSTALLED ONTHE VEHICLE (See Section C,
page 6 under"Regulating Pressure").
PREPARATION
TOOLSREQUIRED:
T-281843 SocketWrench for coil base
T-308430 Restaking Tool
12 x 1/2" Rodtouse withT-281843
1-1/8" SocketWrench
7/8" End Wrench
Screwdriver
Long nosed Pliers
Unit replacement kits are available for servicing
the switch, coll, piston and valve, andthe regu-
lator assemblies. These kits contain the parts
and essential gaskets necessary to make there-
pairs.
DISASSEMBLY
CAUTION: Beforedismantlingpump, be sure all
fuel has beencompletely drained out. Avoid
getting fuel into the switch. Ifthe coil gets wet,
it must be thoroughly dried out before reinstalling.
A. FILTERBOWL
1. Unscrewbail nutat bottom of pump and
swingbail toone side.
2. Removesedimentbowl,gasket,filter,
filter base and spring.
B. INTAKE VALVE
1. Using a 1-1/8" open end wrench, remove
Intake valve by turningcounter-clockwise
(A, Figure 3).
C. SWITCH
1. Remove red seal with a small pin punch.
2. Using a 7/8" wrench,turnswitch cover
counter-clockwise until coverdisengages
from the studs onthe body ofthe pump
(Figure 2).
3. Moistenwirelead at cover grommet and
slide switch cover back.
4. Pull switchawayfrompumpbody to
remove.
5. Removecontact sleeves fromswitch and/
or coil (Figure 4).
PRE SSURE I
REGULATOR_T~ |ji/
_..^S
>ARGI LUG
FILTER BOWL-
BAIL NUT
BAIL
FIGURE 1
FIGURE 2
Printed in U.S.A.
Stewart-Warner Corpo
1826 W. Diversey Pkwy.
SER 4745
Chicago 14, Illinois

(Symbol of
SERVICE INSTRUCTIONS
240 SERIESELECTRICFUELPUMP
SWITCH KITNO. 426944
Stewart!
(A) (B) (C)(D)
oO
CONTENTS OF KIT
(A) 1-427879 Seal
(D) 2-425650Sleeve
(C) 1-425655Gasket(Small)
(D) 1-425660Gasket(Large)
(E) 1-425601Switch & Lead Assem.
(F) 1-432975Bowl Gasket
After the switch has beenremoved, It will be
necessary to partiallydisassemble the pump
before the switch canbe replaced.
Failure to follow theseInstructions will result In
damaging the actuator arm bushing.Correct
procedure Is as follows:
1. Install the switchcontact sleeves onto the coll
terminals.
2. Unscrew ball nutat bottom of pump and swing
ball toone side.
3. Remove sediment bowl, gasket,filter,filter
base and spring.
4. Using a suitablewrench,removeIntakevalve
assembly by turningcounter-clockwise.
5. Trip actuator armof switch upward. (Fig. 1).
Figure 1.
6. With finger pressure hold piston to its upper-
most position, then release pistonapproxi-
mately 1/8". THIS ISTHE ONLY POSITION
OFTHE PISTON THAT THE SWITCH CAN
BE REINSTALLED.
IMPORTANT: Always usenew gaskets and seal
rings during reassembly.
7. With gaskets In place, press switch Intopump
body making certain the switchcontactsengage
with the contact sleeves. Dueto alignment
slot on switch, It can only be Installedoneway.
8. Replaceswitchcover and secure. Note: Vent
hole In covermustfacedownward.
9.Be certain the "O" ring andthe washer are In
place atthe protrudingportion ofthe piston
tube.
10. Insertpowerspring after the piston.Replace
Intake valve,tighteningclockwiseuntil itis
snug.Overtightening will cause the piston
tube to collapse. When properlyassembled
there will bea space between the valve and
coll base.
11. After inspection or cleaning of sediment bowl,
assemblefilter as shown In Fig. 2.
Figure 2.
12. Check operation of pump before installation.
For moredetailedinformation see SER-SW 4745
Printed in U.S. A.
STEUJflRT-LUflRPER CORPORflTIOR
1826 W. DlverseyParkway
Chicago, Illinois 60614
P.N. 434354
SER 4746

T
0 b ((
IWWWI
A B C D E F G'H M
FIGURE 3
FIGURE 4
D. PISTON
1. Turn pump right side up; the powerspring
and pistonshouldfallinto the hand(Figure
5). If piston sticks, tap pump body on
hardsurface.
\
FIGURE 5
E. COIL
1. Placepump,bottom endupina vise with
the switchopeningagainst oneofthe jaws
of the vise (Figure 6).
2. Using Tool No. T-281843 removecoil
base (E, Figure 3)by turning counter-
clockwise.Washer (C, Figure 3) will fall
out.
3. Remove "O" ring from center opening of
coil base (D, Figure 3).
4. Removecoiltensionwasher (G, Figure 3).
5. Gently tap pump body on flat surface. Coil
and gasket (F& J, Figure 3) will fall out. •
F. REGULATOR AND VALVE
1. Removal of the six screws attopof pump
releases the pressure regulator cover.
2. Remove pressure regulatorspring (E,
Figure 7), regulator button (F, Figure 7),
diaphragm (G, Figure 7)and gasket (H,,
Figure 7).
3. With 1-1/8" wrench remove the regulator"
valve assembly by turningcounter-
clockwise (J, Figure 7).
4. Removegasket between valve and pump
body (K, Figure 7).
FIGURE 6
f T'.H'H
(D cn
FIGURE 7
CHECKING AND REPAIR PROCEDURES
A. SWITCH
1. Check physical operation ofthe switch by
gently flicking actuator armupand down.
2.Ifno positive snapping action is experi-
enced, replace the switch.
3. Check toseeif contactpins are tight. If
any evidence of looseness is present, re-
•place switch.
4. Check continuity and switch action by using
a continuity tester. Place one lead ofthe
tester onthe body ofthe switch andthe
other lead tothe contact pin which does

not have the switchleadwireattached.
Flick actuator armofthe switch, circuit
should indicate open and closed onthe
meter.
NOTE: This switch isnot serviceable, andisto
be replaced asan assembly. .Use Unit
Replacement KitNo. 426944.
NOTE: If contact sleeves (A)are
damaged, replace.
FIGURE 8
B. INTAKE VALVE
1. This unit canbe checked by placing the
threadedportion to your lips and forcing
air into the valve.
2.Ifthe valve leaks, theair will escape and
must be replaced.
NOTE: This valve isnot serviceable andistobe
replaced asan assembly. Use Unit Re-
placement KitNo. 426946.
C. PISTON
1. Inspect bumper spring. The minimum
measurement ofthe power spring ofa 6
volt pump is 1-21/32" while that ofthe12
and 24 volt pumpsmeasures 1-7/8" (Fig-
ure 10).
FIG, 9
il
6v 12v+J4v
FIG. 10
FIG. 11
2. Place the bumperspring opening ofthe
piston tothe lips and force airtothe
pistoncheckvalve. Ifair escapes, re-
place the piston.
3. Light score marks will be present after
piston has been in useand in no way affects
the performance ofthe pump. The normal
appearance ofthe piston after use Is
shown in Figure 11.
Inspect the pistontube for nicks or scars.
A tube which indicatesnormalwearwill
have a slight ring atthe lower end. This
will be felt by running the finger inside the
tubeopening.
Check whetherpistontube is properly
sealed by placingindexfinger onendof
tube and, without force,attempt to wiggle
(Figure 12). Thereshould beno move-
ment ofthe pistontube.
IMPORTANT: To properly rebuild the
pump and Insure against leakage, the
piston tube must be re-staked. Use Tool
No. T-308430(Figure 13). The re-staking
toolconsists oftwo parts; base and piston
tube guide anda stakingpunch. Touse
this tool, place the pump casting over the
base. The pistontubeguide will auto-
matically center both the casting andthe
pistontube.Place the restaking punch
over the pistontube.Using a 1-1/2pound
hammer, strike the punch sharply oneor
two blows.
FIGURE 12
FIGURE 13

FIGURE 14
D. COIL
the 1. Using a continuity tester, connect
leads tothe coilplatecontacts as
in Figure 14.
2.If continuity is positive anda visual in-''
spectionuncovers no problem, the coil
ml^ bec considered satisfactory.
NOTE: This $pil isnot .serviceable and should
be replaced with a Unit Replacement Kit
of the propervoltage.
E. REGULATOR AND VALVE
1. Repeat test procedure outlinedunder"In-
take Valve". Ifair escapesreplace valve.
2. Check for broken or distortedregulator
spring (E, Figure?). The normallength
is 7/8".
3. Inspect the diaphragm for cracks or wear.
NOTE: Thisvalve isnot serviceable and should
be replaced using Unit Replacement Kit
No. 426946.
ALIGNING STEP
NOTCH
FIGURE 15
ASSEMBLING
Whenever a pump is disassembled,always re-
place all gaskets to assure a perfect seal. Gasket
Kit No.812108 includes all necessarygaskets,etc.
A. REGULATOR AND VALVE
1. Insertgasket between valve and pump
body.
2. With a 1-1/8" wrench,tighten the pres-
sureregulatorvalve by turning clockwise.
The regulator valve should be tightened
to25 foot pounds of pressure oras tight
as possible without putting housing in vise.
3. Installgasket (K, Figure 7), diaphragm
(G, Figure 7), button (F, Figure 7),and
regulatorspring (E, Figure 7). Make
sure the spring is perpendicular andcan
move freely inthe adjustment screw be-
fore tightening pressure cover with six
screws attopof pump.
B. COIL
1. Insert pump housing in vise,bottom end
up, with the switch opening against one
jaw ofthe vise(Figure 6).
2. Looking into the bottom ofthe pump body,
note that therib directlyopposite the
switch opening (A, Figure 15)hasan
aligning step onit.The notch inthetop
of the coil (B, Figure 15) should rest on
this aligning step when the coil is properly
seated.
The coil is seated when the side ofthe
coil body is visible atthe switch opening
(Figure 16).
3. Place fiberinsulatorover base of coil.
4. Replacecoiltensionwashercurvedside
toward the coil base (G, Figure 3).
5. Using Tool No. 281843 with a one foot rod
install the coilbase and tighten with ap-
proximately 75 foot poundstorque oras
tight as possibleusing theone foot rod.
TOPOF COIL
FIGURE 16
C. SWITCH AND PISTON
1. Install contact sleeves into the coil term-
inals (Figure 16).
2. Trip actuator of switch upward(Figure 17).
3. Slide new sponge rubber gasket (Figure
17) on the barrel ofthe switchhousing and

sealinggasket on otherend.
4. Slideswitchcontactpinspartiallyinto the
coilterminals. Donot press switch all
thewayinat thistime.
5. Installpiston.
a. Lay pump on side.
b. Slidepistonintotubeuntil it touches
the end.
c. Using a finger asa stop,tilt the pump
and allowpiston to slidebackabout
1/4". Thiswillallow the switchact-
uator pinto slide into the cut-away
section of the piston.
6. Press switch alltheway into the housing.
7. With gaskets in place, press switchinto
pumpbody,making certain the switch
contactsengage with the contact sleeves.
Due tothe alignment slot onthe switch, it
can only be installed one way.
8.. Secureswitch cover by engagingcover
with studs onthe pump body and turn
clockwiseusing a 7/8"wrench.Make
certain the smallhole inthe switchcover
faces the bottom ofthe pump.
9.On later modelpumpslineup the seal hole
in the switchcover with the hole inthe
pump body andtapa new switch seal into
place.
IMPORTANT: Although the switch canbe
removed without partialdisassembly of
the pistonassembly, it cannot be rein-
stalled inthe samemanner. Failure to
lower the piston when reinstalling the
switch willresult in damage tothe actu-
ator armand bushing.
FIGURE 17
D. INTAKE VALVE
1. Place "O" ring (D, Figure 3)in place and
if necessarypush down with a small
screwdriver so that it clears theendof
the pistontube.
CAUTION: Donot damage "O" ring.
Place washer (C, Figure 3)ontop of "O"
ring. Donot allow'washer to hang upon
the endofthe pistontube asit willdamage
the tube when the intakevalve (A, Figure
31 Is tighteneddown.
FIGURE 18
3. Insertpower spring (K, Figure 3).
4. Place bumper bushing (B, Fig. 3)in intake
valve (A, Figure 3)sothe narrowedge
seats onthe bottomfeet ofthe spider.
Thetopofthe bushingwill then be approx-
imately7/32"from thetopofthe valve
(Figur° 19).
5. With bushing in place insert intakevalve.
Tighten valvefingertightplus 1/4ofa
turn with a 7/8"wrench(approximately 8
foot pounds of torque). Take care notto
overtighten as this may distort piston
tube and cause the piston to stick.
CAUTION: Donot seat the intakevalve
on the coil base (See Figure 18).
IMPORTANT: Ifthe pumpbeing repaired
did not include a bumperbushing, be sure
to installone. The spring must bere-
placed because whenusedwithbushings
they are shorter. ReplacementKits in-
cludebushing and spring. They are
430083 for6 and 430084 for12and24 volt.
SPIDER
BUSHING IN
POSITION
7/32"
FIGURE 19

FIGURE 20
E. FILTER BOWL ASSEMBLY
1. Afterinspection or cleaning of sediment
bowl, always usea new bowl gasket(Fig-
ure 20).
2. Place spring inside sedimentbowl(Fig-
ure 20).
3. Place filter base ontopof spring as shown
(Figure 20).
4. Place filter ontopof filter base (Figure
20).
5. Place gasket ontopof sedimentbowl
(Figure 20.
PERFORMANCE
A. EstablishingStandardLoad Test
1. All tests should be madeusing 5/16"O.D.
tubing on both the inlet and discharge side
of the pump. The pump shall also be
tested ina verticalposition with the inlet
part approximately 12"andnot exceeding
24" above the level ofthe fuel supply.
Thesechecks canbe madeeither onthe
vehicle orata bench test.
B. Pressure
1. Place fuel pump ona 650-BTestFixture
(Figure 22)or other suitable fixture if
available. With the lower or intakepart
connected to a fuel supply, connect a pres-
sure gauge anda bleeder valve tothe dis-
charge ortop part ofthe pump.
2. Ifa test fixture isnot available, test the
pump while itis mounted onthe vehicle,
placegauge and bleedervalve atthe car-
buretor endofthe fuel line(Figure 21).
3. Connect the pump toa power supply of
propervoltage and operate.
4. With the bleedervalve wide open,allow
the pump to prime. Slowly close the
bleedervalve toa pointwhere it will only
permit a fine trickle of fuel. This flow
should be just a littlemorethan a drip.
The pump has reached its regulated pres-
sure when the pump operation slows and
the gauge Is atits highestreading.
C. Regulating Pressure
1. Removerubberdustcover attopof pump.
240-A
Bleeder Valve -
FIGURE 21
2.To increase pressure, loosen the regu-
lator lock nut (5/8"open endorbox
wrench) and using a screwdriver, turn
the regulatoradjustingscrewclockwise
(Figure 22).
3. To decrease pressure, turnregulator
adjusting screwcounter-clockwise (Fig-
ure 22).
4.In order to insure an accurateadjustment
it is necessary to open the bleedervalve
each time the pressure regulatoradjust-
ment is moved.
5. After the desired pressure is obtained
(4 pounds per square inch is normal)
tighten the regulatorlocknut.
D. Volume
1. With the pump connected toa fuel supply,
and the desired pressure has beenmain-
tained,operate the pump.
Observe the time required to expel one
pint of fuel into a suitable comtainer as
illustrated in Figure 22.
3.It should be30 seconds or less fora 6
volt pump, 25 seconds or less fora 12
volt pump.
4.If pump fails on either the pressure or
volume test, refer tothe Diagnosis Chart.
NOTE: All performancechecksshould
not be madeunless the full powersupply
is available.
FIGURE 22

CONDITION PROBABLE CAUSE
REMEDY
1. Pump stalls andishot
to touch or pump operates
intermittently, delivers
little orno fuel.
A. Poorground or wirecon-
nections
B. Wronggaugewire
C. Damagedswitch
D. Damaged piston tube
binding onthe piston
A. Make sure pump is properly
grounded...
B. UseNo.10 gaugewire
C. Replaceswitch
D. Replace pumpbody.
2. Pumpdoes not operate
A. Open circuit in switch
B. Open circuit in coil
C. No ground or break
in wiring
A. Replaceswitch
B. Replacecoil
C. Connectground wire. Solder
all wireconnections, replacing
broken or worn wiring.
3. Pump operates inter-
mittently or delivers
little orno fuel
A.Bad connection of wire
lead.
B.Bad groundconnection
C. Intakelineclogged
D. SedimentBowlclogged
E. Broken or damagedspring
in contactswitch
F. Nylon bushingpushedback
on switchactuating arm
G. Damagedpistontube
binding on piston
A. Check all pumpwiring and
connections
B. Using a jumperwire,hold one
end to pump body and ground
the other. If pump operates,
make a permanentground
connection
C. Disconnect line from pump
inlet port. If pump operates,
removeintakeline,clean and
drain fuel tank.
D. Removesedimentbowl and
filter. Cleanthoroughly and
replace using new bowl gasket
E. Removeswitch and check
physical operation.
F. Replaceswitch
G. Replace pump body.
Pump races or delivers
little orno fuel
A. Fueltankempty
B. Leak in intakeline
C. Leakaroundsediment bowl
D. Vapor in lines
E. Faulty or dirtyintakevalve
F. Filter clogged .
A. Check fuel supply
B. Checkline and fittings for leak
at intake port. Replacefittings
using a sealingcompound
C. Replacegasket and tighten
bail nut
D. See that pump is mountedaway
from extreme heat.
E. Inspectintake and pistoncheck
valves. See PistonAssembly,
page 3. Replace as necessary.
F. Removesedimentbowl and
clean parts thoroughly. Re-
using new how! gasket

CONDITIONS
5. Uncontrollable discharge
pressure
-
6. Fuelleaks attop
of pump
7. Fuelleaks at switch
assembly
8. Fuel leaks at car-
buretor
PROBABLE CAUSE
A. Damaged regulator spring
or faulty regulatorvalve
B.Air leak onthe intakeside
of the pump.
A. Brokendiaphragm
B. Coverscrews loose
A. Poor seal between small
switch gasket and pump
body
B. Damagedswitch
C. Damaged "O" ring and
washer
D. Damagedcoilgasket
E. Loose piston tube
A. Carburetorclogged or
connection loose.
REMEDY
A. Replace parts
B. Tighten all fittings. Install
new bowl gasket.
A. Replacediaphragm
B. Tightencover screws
A. Replaceswitch and gaskets •
B. Replaceswitchusing new
gaskets.
C. Replace.. Seat "O" ring and
washerbefore tightening.
D. Replace.Seatgasketbefore
tightening.
E. Restakepistontube.(Use
special Restaking Tool
T-308430.)
A. Checkcarburetor and
connections.
8

SYMBOL OF
SERVICE INSTRUCTIONS STEWART
EXCELLENCE
240 SERIES ELECTRIC FUEL PUMPS
REGULATOR Kir NO. 426945
^DIAPHRAGM
* VALVE ASSEMBLY
* BODY GASKET
*VALVE ASSEMBLY GASKET
WARNER
REGULATOR
SPRING
PUMP BODY
DISTRIBUTION
PLATE
„ -'(6) COVER
ADJUSTMENT
PUMP BODY
COVER
^J
PULSE CHAMBER
LOCKNUT
1
* INDICATES PARTS CONTAINED IN KIT.
KIT CONTENTS
(1) 425654 Valve Gasket (1) 425645 Diaphragm
(1) 425626 Valve Assembly (1) 425646 Regulator Spring
(1) 425656 Body Gasket
CAUTION: // adjustment screw is removed or loosened', the pump will require rccalibration for
proper pressure delivery.
DISASSEMBLY
1. Place fuel pump ina vice inthe uprightposition
and secure.
2. Remove thesix(6) screws on cover of pump.
NOTE: While removing the screws hold cover down
with hand. The cover is under pressure due to the
adjustment screw and regulator spring.
3, Slowlyremovecover,regulatorspring and distri-
bution plate.
4. Remove diaphragm and body gasket.
5. Using a wrench (box endor socket), turn counter-
clockwise to remove the valve assembly and valve
assembly gasket.
CAUTION: Donot nick, scratch ormar body
machined surface for gasket 425656. This will
prevent leaks.
NOTE: Before assembly clean the surfaces ofthe
pump body to insure proper seating of gaskets. This
will reduce the possibilities of leaks.
1. Place new valve gasket onnew valve assembly.
2. Insert new valve assembly and gasket intobody of
pump.Turnclockwise with suitable wrench(box
end or socket) until firmly seated.
3. Place new body gasket and diaphragm on body of
pump.Align the holes in gasket and diaphragm to
those in pumpbody.
ASSEMBLY
4. Center distributionplate on diaphragm.
NOTE: Pilot on distribution plate must beontop
to align with regulator spring.
5. Place regulator spring on distribution plate (over
pilot).
6. Replace the cover and position the holes in cover
to align with holes in body of pump.
NOTE: Pressure may have to be applied on cover
to start the screws back in to pump body. If so hold
cover down against pump body and insert screws,
then tighten screws.
Printed in U.S.A.
FOR FURTHERSERVICE,CONTACTYOURLOCAL
STEWART-WARNER DISTRIBUTION CENTER
STEUJflRT-LURRnEB CORPORRTIOd
1826 W. Diversey Parkway
Chicago, Illinois60614
P.N.434355
SER 4747