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PART LIST −
Reference image on page 3
Key
Part No.
0
20409043
Service Kit*
1
20404003
Upper Housing Assy Kit
2
20407030
Check Valve Kit - EPDM
w/O-Ring & Ferrules
3
20403040
Diaphragm Kit, Santo
w/Pistons & Screws
4
20419002
Lower Housing
5
02009080A
Motor 12 Volt DC 2840-100
——
Motor 12 Volt DC 2840-110
——
Motor 12 Volt DC 2840-120
02019027A
Motor 24 Volt DC 2840-300
——
Motor 32 Volt DC 2840-400
——
Motor 115 Volt AC 2840-000
"
20799000A
Accumulator Tank
*Service Kit includes #2, #3, #8 and drive cam assembly.
DISASSEMBLE
Pressure Switch (9)
1. Disconnect power to pump and open a faucet or valve to relieve
system pressure.
2. Remove the two visible Pressure Switch Screws located on each side
of the Pressure Switch (9). DO NOT ADJUST ALLEN HEAD SCREW
IN CENTER OF SWITCH.
Upper Housing (1)
3. Loosen but DO NOT remove the four Pump Head Screws and care-
fully remove Upper Housing Assembly (1).
4. Slide Port Clip (8) back and unplug from Tank Plumbing.
5. Remove Check Valve (2) and inspect for debris.
Check Valve Assembly (2) Follow Steps 1, 3 & 4
6. Inspect Check Valve (2) and O-Ring
Lower Housing (4) Follow Step 1
7. Remove pump from both Base and Tank Plumbing.
8. Remove Rubber Feet by pulling out and sliding to the rear and fol-
low step 3.
9. Rotate Lower Housing (4), so access Rubber Grommet foot notch is
aligned with Cam Bearing Set Screw (4-C), loosen set screw with a
1/8" Allen Wrench and slide pump head off motor shaft.
Diaphragm (3-B)
10. Loosen four cam piston screws with Phillips head screw driver and
pull apart cam (4-B) from Inner Pistons (3-A). (Both pistons (3-A &
C) should be replaced when a new Diaphragm (3-13) is installed.)
Motor (5) Follow Steps 1, 7, 8 & 9
Description
Qty
Key
Part No.
"
120796000A
1
6
20381022
1
1
7
20406002A
8
20408000
1
9
02090118
1
"
04325143A
—
"
04305144A
—
"
04305500A
1
"
04325343A
—
"
04325443A
—
"
04325043A
1
"
01740000
REASSEMBLE
Diaphragm (3-B)
1. Insert Outer Pistons (3-C) into Lower Housing (4-A) by bending pis-
tons at center fold.
2. Placing the Diaphragm (3-B) (flatter side of Diaphragm facing the
motor) on the Lower Housing (4-A). Press each Inner Piston (3-A)
through the Diaphragm and Lower Housing (4-A) into Outer Pis-
ton (3-C). Hex stem of Inner Pistons (3-A) must be aligned into hex
holes in Outer Pistons (3-C). Tighten cam piston screws partially,
center piston in diaphragm, and tighten screws securely (18 in. lbs.
torque). Also, the Outer Pistons (3-C) must be aligned with align-
ment slots on Cam Assembly (4-B) making sure screw holes align in
cam assembly, otherwise diaphragm will leak.
Cam Bearing (4-B)
3. Place Cam Bearing (4-B) over Inner Pistons (3-C) and tighten down
with four Phillips Head Screws. (18 in. lbs. torque)
Lower Housing (4) to Motor (6)
Coat motor shaft with grease prior to installing Cam Bearing (4-B).
4. When installing the Lower Housing (4), rotate mounting foot notch
to align with Cam Bearing Set Screw (4-C).
5. Attach Cam Bearing (4-B) to motor shaft indentation with Cam Bear-
ing Set Screw (4-C). (35 in. lbs. torque)
6. Reinsert Rubber Feet.
Check Valve (2)
7. Place Ferrules (Rubber Cones) in the Upper Housing (1) coned side
first.
8. Properly seat O-Ring in Check Valve (2) and insert Check Valve (2)
into the Upper Housing (1).
Upper Housing (1)
9. Place Upper Housing (1) on top of the Lower Housing (4-A) and
tighten Hex Bolts (30 in. lbs. torque) through the Upper Housing (1)
to the Motor.
4
Description
Base
Port Kit - (set of 2)
Hose Barb, 90° 3/4"
Hose Barb, Straight 3/4"
Pump Head Assy.
Port Clips (Set of 2)
Pressure Switch - 40 PSI Off, Sealed
Complete MPU w/Strainer - 12V 4.5 GPM
Complete MPU w/Strainer - 12V 3.5 GPM
Complete MPU w/Strainer - 12V 3.3 GPM
Complete MPU w/Strainer - 24V 4.5 GPM
Complete MPU w/Strainer - 32V 4.5 GPM
Complete MPU w/Strainer - 115V 4.5 GPM
Strainer, Inline 3/4" Hose Barb
Qty
1
1
1
1
1
1
1
1
1
1
1
1
1
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