“QUAD II DIAPHRAGM”
4305-144/4305-510
AUTOMATIC WASHDOWN PUMPFEATURES• Self-Priming• Dry Running• Soft, Noise Absorbing Mounts• Corrosion Resistant Materials• Meets U.S.C.G. Electric Standards• Thermally Protected

SPECIFICATIONS
Motor: Permanent Magnet, Ball Bearings at Front &Rear Endbell. CE Models are fully
suppressed.
Pump: Four chamber positive displacement
diaphragm design; Self-priming up to 6 ft.
suction lift; Pump able to run dry without
damage; Removable port to hose connectors.

MODEL*VOLTS

4305-144D
4305-144L
4305-510A
4305-510H

12V dc12V dc12V dc12V dcPump Series

Dimensions - Inches (mm)HeightWidth
LengthWeightlb. (kg)

4305-144

3.75 (95)

6.3 (160)

8.6 (218)

4.5 (2.1)

4305-510

3.75 (95)

6.3 (160)

8.2 (208)

3.9 (1.8)

AMP DRAWFLOW
PRESSURE SWITCHPRESSURE@ 10 psi (0.7 bar) GPM (l/min)
MAX psi (bar)
STRAINERNOZZLE

5.0
5.0
4.0
4.0

3.5 (13.5)
3.5 (13.5)
3.0 (11.3)
3.0 (11.3)

40 (2.8)40 (2.8)
50 (3.4)
50 (3.4)

No
Yes
Yes
Yes

No
Yes
YesYes

COILED
HOSE

NoNoNoYes* CE fully suppressed models are identified by a prefix “R” and a CE mark on the label. (i.e. R4305-144).
Self Declaration Of Conformance (SDOC) is available upon request.

OPERATION
With pump intake connected to inlet strainer and supply
tank or through hull fitting and operation switch off, open
outlet valve, then turn pump switch on. Water will begin
to flow, when water is free of air turn valve off. Whenvalve is shut off pump will stop. Should pump fail tostop, turn switch off and see the trouble shooting guide.

As a circulation pump, always run full flow with norestriction. Use 3.5 GPM pump for tanks up to 30
gallons. Divert excess water, but do not restrict flow.
For portable use we recommend the pump be mounted
on a base (i.e. 3/4” x 8” x 10” board or plywood), add alength of cable with alligator clips for batteryconnection.

C
Fresh Water
Tank

Flojet
Washdown Pump

Thru Deck
Fitting

Flojet Inlet
Strainer"Y" ValveA

Seacock

BINSTALLATIONSTEP I
Remove shipping plugs from Quad pump ports. Somewater from factory testing may spill out.
STEP 2
Install inlet A and discharge B port connectors. Firmly
push slide clips C forward to lock port connectors inplace.

STEP 5
Use 3/4” or 5/8” I.D. flexible hose (preferably braided orreinforced). Use hose clamps on the slip-on barb hoseconnectors.
STEP 6
Install a 40 mesh in line strainer in accessible location
between tank and pump inlet.

STEP 3Slide rubber mounts fully into 4 mounting tracks.
STEP 4
Mount pump vertically, with pump head down orhorizontally in an accessible location. If mounting
vertically, motor up, attach motor mounts first thenpump head mounts, while supporting weight of pump.
Black (–)

Red (+)

Fuse(+)(–)

SwitchBatteryWIRING
STEP IUse 14 gauge stranded wire to 20’, 12 gauge to 50’,
from power source.
STEP 2
Use a 15 amp rated on-off switch on the (+) positive (red)motor lead.
STEP 3
Install 15 amp fuse protection on the positive lead.

TROUBLESHOOTINGWARNING: BEFORE SERVICING PUMP, TURN OFF PUMP AND DRAIN WATER FROM SYSTEM!!
Failure to Prime - Motor operates, but no pump discharge• Restricted intake or discharge line
• Air leak in intake line
• Debris in pump
• Punctured pump diaphragm (pump leaks)• Crack in pump housing
Motor falls to turn on• Loose wiring connection• Pump circuit has no power• Blown fuse
• Pressure switch failure• Defective motor• Open thermal protector

Pump Fails to Turn Off After All Fixtures Are Closed• Empty water tank
• Insufficient voltage to pump (low battery)• Punctured pump diaphragm (pump leaks)• Discharge line leak
• Defective pressure switch
Low Flow and Pressure• Air leak at pump intake• Accumulation of debris inside pump and plumbing• Worn pump bearing (excessive noise)• Punctured pump diaphragm (pump leaks)• Defective motor

Pulsating Flow
19

• Restricted pump delivery. Check discharge lines, fittings andvalves for clogging or undersizing

2

6

3

5

4

7 Includes items 1 thru 4

Quite often when a pump is worn or defective the one failed component has overburdened others. To avoid frequent aggravating
repairs, Flojet offers service kit assemblies making repairs as quick and easy as possible.

DISASSEMBLEREASSEMBLE

Upper Housing
1. Remove switch (9). Disconnect switch wires.

Motor
1. Reassemble lower housing assembly (4) to motor. (Followsteps 4 to 10.)Diaphragm
2. Lower housing is assembled with:• Flat side of diaphragm and outer pistons facing motor• Hex stem of inner pistons must be aligned into hex holes inouter pistons (4).
• Outer pistons must be aligned with alignment slots on cam
assembly making sure screw holes align in cam assembly,
otherwise diaphragm will leak.
3. Tighten cam piston screws partially, center piston indiaphragm, then tighten screws securely (18 in. lbs. torque)
Lower Housing
4. Reassemble lower housing assembly (4) to motor.
5. Retighten set screw securely. Set screw head must be
positioned facing motor covering seam (indentation).
(Positioning of this screw is critical to avoid misalignment andsubsequent diaphragm damage.)
Upper Housing, Check Valve
6. Reassemble upper housing (1)7. Properly seat O-Ring in check valve assembly (2) and checkif ferrules and screen are in place on upper housing (1)8. Install check valve (2) into upper housing (1) and push in.
9. Assemble on to lower housing (4), align 4 screws on to motor
by rotating lower housing (4) if necessary to align feet.
10. Tighten screws evenly to 30 in. lbs. torque.
Pressure Switch
1. Place switch against front of pump (9), insert screws and takecare not to cross thread or strip out threads in housing.
2. Reconnect wires.

Upper Housing
2. Loosen but do not remove four pump head screws andcarefully remove upper housing assembly (1)3. Inspect check valve (2) for debris
4. Reassemble new upper housing (1)Check Valve Assembly
Follow steps 2
3. Replace check valve (2)4. Reassemble upper housing (1)Lower Housing, Diaphragm, Motor
Follow step 2
3. Rotate lower housing (4) so mounting notch opening on lower
housing exposes set screw which holds bearing housing toshaft.
4. Loosen this set screw by inserting wrench 1/8” Allen wrench
into mounting notch opening. Then, slide lower housing (4) off
motor shaft.
Diaphragm Cont’d
5. Loosen four cam piston screws with Phillips head screw
driver and pull apart cam from inner pistons. (Pistons should
always be replaced when a new diaphragm is installed.)
Motor Cont’d
5. Replace MotorWASHDOWN PUMP SERVICE PARTSMODEL#DESCRIPTION

4305-1440Service Kit*

20409-043

20409-043

1

Upper Housing With Clips

20404-003

20404-003

2

Check Valve Assembly

20407-030

20407-030

3

Diaphragm Assembly (includes screws)

20403-040

20403-040

4

Lower Housing Assembly

20419-002

20419-002

KEY#54305-510

Motors02009-087A

02009-073A

Motors CE Models

R2009-087A—Ports - Garden Hose (pair)20381-007

20381-007Ports - 3/4 Barb (pair)20381-006—

Ports - 1/2 Barb (pair)—20381-002

7

Pump Head Assembly

20406-002A

20406-002A

8

Side Clips (pair)20408-000

20408-000

9

Pressure Switch Assembly

02090-118

02090-118

6*Service Kit includes #2, #3, #8 and drive cam assembly.

ACCESSORIESQUICK CONNECT PORT SYSTEM

20381-000

20381-002

20381-006

20381-007

QUAD PORT x
QUAD PORT x
QUAD PORT x
1/2" MALE QEST. 1/2" HOSE BARB 3/4" HOSE BARBSTRAIGHT
STRAIGHT
STRAIGHT

20381-008

20381-009

20381-010

QUAD PORT x
QUAD PORT x
QUAD PORT x
QUAD PORT x
GARDEN HOSE 1/2" MALE QEST. 1/2" HOSE BARB 3/4" HOSE BARBSTRAIGHT
90° ELBOW
90° ELBOW
90° ELBOWThe above part numbers are packaged with 2 fittings per bag.
Pump Series

Strainer Number

Inlet

OutletScreenSTRAINER

4305-144

1740-000

3/4” Barb

3/4” Barb

40 MeshSTRAINERPRESSURE NOZZLE

4305-510
Any

1740-002
20446-000

1/2” Barb
3/4” GH

1/2” Barb—40 Mesh—

WARRANTY

RETURN PROCEDUREFLOJET warrants this product to be free of defects in material
and/or workmanship for a period of one year after purchase by thecustomer from FLOJET. During this one year warranty period, FLOJET
will at its option, at no charge to the customer, repair or replace thisproduct if found defective, with a new or reconditioned product,
but not to include costs of removal or installation. No product will
be accepted for return without a return material authorization number. All return goods must be shipped with transportation charges
prepaid. This is only a summary of our Limited Warranty. For acopy of our complete warranty, please request Form No. 100-101.

Prior to returning any product to FLOJET, call customer service foran authorization number. This number must be written on theoutside of the shipping package. Place a note inside the package with an explanation regarding the reason for return as wellas the authorization number. Include your name, address andphone number.

www.flojet.com

U.S.A.
Flojet17942 Cowan Avenue
Irvine, CA 92614
Phone: 949.608.3900
Fax:
949.608.3887

UNITED KINGDOM
FlojetBingley Road, Hoddesdon
Hertfordshire EN11 OBU
Tel: +44 (0) 1992 450145
Fax: +44 (0) 1992 467132

Flojet is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem, Inc. 81000-267 Rev D 10/2012

JAPANNHK Jabsco Company Ltd.
3-21-10, Shin-Yokohama
Kohoku-Ku, Yokohama, 222
Tel: 045.475.8906
Fax: 045.475.8908

GERMANY
Jabsco GmbH
Oststrasse 28
22840 Norderstedt
Tel: +49-40-53 53 73 -0
Fax: +49-40-53 53 73 -11

ITALY
Jabsco Marine Italia
Via Tommaseo, 620059 Vimercate, Milano
Tel: +39 039 685 2323
Fax: +39 039 666 307