© 2014 MDM INC.
Economy With Efficiency.
© 2014 MDM INC.
Economy With Efficiency.
© 2014 MDM INC.
Economy With Efficiency.
Proudly Made in the USA
Proudly Made in the USA
© 2014 MDM INC.
Economy With Efficiency.
INSTALLATION
Please read carefully! When properly installed, the Valuflo™ 750 will provide dependable, trouble-free service.
1. Do not submerse the unit in water - it is not a submersible pump. Do not allow the pump to become submerged during transient periods, such as heavy rain,
run-off, etc.
2. Locate the pump as near the water source as possible. A flooded suction is preferred.
3. The pump is not self-priming. Therefore, if the fluid level is below the pump, a swing check valve must be installed below water level. The pump and inlet line
must be primed prior to start up. Do not run pump dry! For non-flooded installations, a strainer basket and check valve are recommended.
4. Mount the motor base to a secure, immobile foundation.
5. Use only plastic fittings on both the inlet and discharge ports. Seal the inlet & discharge fittings with Teflon™ pipe dope. These fittings should be self-supported
and in neutral alignment with each port (i.e., Fittings must not be forced into port alignment which may cause premature line failure or damage to the pump volute).
6. Never restrict the inlet! Keep both inlet and discharge lines as free of elbows and valves as possible. Always use pipe of adequate diameter. This will reduce
friction losses and maximize output. Never use an inlet line of smaller diameter than the discharge line. Minimize the suction lift.
7. For additional plumbing tips, review MDM’s website: www.mdminc.com for pond plumbing and pump installation hints.
ELECTRICAL HOOK-UP
CAREFULLY, EXAMINE THE POWER CORD BEFORE USE. DO NOT USE THIS POWER CORD IF THERE IS ANY VISIBLE DAMAGE. DO NOT USE THIS POWER CORD IN WATER OR IF
THE MOTOR OR ELECTRICAL RECEPTACLE IS IN CONTACT WITH ANY STANDING WATER! THIS POWER CORD SHOULD ONLY BE PLUGGED INTO A PROPERLY INSTALLED 115
VAC GFI RECEPTACLE! ALWAYS TEST CYCLE A GFI RECEPTACLE TO DETERMINE ITS CONDITION BEFORE USE!
DISASSEMBLY
1 . Shut off power to the motor before servicing any pump!
2. Unplug the power cord.
3. Disassemble the volute from the bracket - six P-Bolts and six flanged lock nuts. The volute may remain attached to the plumbing to help simplify re-installation.
4. Lock the shaft by placing a screwdriver blade into the shaft slot at the fan end of the motor. Unthread the impeller from the motor shaft - Take care not to misplace the
small metal impeller washer.
5. Remove the ceramic, with rubber boot, from the impeller hub (if you are replacing the seal).
6. Loosen the four M-Bolts attaching the bracket to the motor. Rotate the bracket counter-clock wise until the screw heads are located in the large key hole slots. Lift off
the bracket from the motor.
7. Remove the carbon-graphite seal assembly from the bracket by pressing it out from the motor-side of the bracket.
Do not pry it out with a screwdriver from the pump cavity-side of the bracket (if you are replacing the seal)!
PUMP END ASSEMBLY
1 . Inspect all pump parts (O-ring, O-ring groove, impeller hub ID, motor shaft, etc.) and clean if necessary.
2. Apply sealant to the bracket bore ID wall and around the seal case - follow sealant mfg. instructions. We recommend using Gasgacinch®.
Silicone sealant can also be used.
3. Press the carbon graphite seal into the bracket while taking care not to touch or damage the carbon graphite face. Never touch or apply pressure to
the carbon graphite seal face!
4. Screw four M-Bolts five complete turns into the threaded holes located on the motor face.
5. Mount the bracket to the motor by aligning the key holes over each bolt head, then rotate clockwise which will position the small key hole slot under each bolt
head. Tighten each bolt with a wrench to secure the bracket to the motor (8-25 lb. in.).
6. Carefully, lubricate the seal seat elastomer OD and impeller hub ID with water. Press the seal seat into the impeller hub making certain that the ceramic is in
evenly - the sealing surface should be parallel with the impeller hub.
7. Apply CLEAN water to the carbon-graphite and seal seat sealing surfaces. Do not use silicon lubricants or grease!
8. Lock the shaft by placing a screwdriver blade into the shaft slot at the fan end of the motor. Thread the impeller onto the motor shaft (Insure that the small
impeller washer is in place on the impeller). Thread until the washer securely contacts the shaft shoulder.
9. Seat the large O-ring into the bracket O-ring groove.
10. Assemble the volute onto the bracket with six P-Bolts (10-24 x 2 3/4” carriage bolts) and six flanged lock nuts. Tighten in a cross pattern (30 lb. in.).
11. Install the drain plug and O-ring, into the volute drain hole.
12. Before operating the Valuflo™ 750, allow a proper cure time for the sealant used in step 2.
We congratulate you on your choice of the Valuflo™ 750 centrifugal pump! Its leading edge design provides you with high output at a minimal operating cost.
It is carefully constructed to give you long term, reliable service. To insure proper performance, we urge you to carefully follow the instructions in this manual.
If you have any questions, please call your supplier for assistance.
PUMP
BALL VALVE
BALL VALVE
SUCTION LIFT
FLOODED SUCTION
SWING CHECK VALVE
VOLUTE
IMPELLER
IMPELLER
WASHER
BRACKET
M BOLT
FLANGED
LOCK NUT
LARGE
O-RING
SS SEAL
P-BOLT
DRAIN PLUG
& O-RING
3.86
3.07
1.89
7.00
DESCRIPTION
MDM P/N
DRAIN PLUG
1000.110 LG
O-RING, DRAIN PLUG
E014B70
VOLUTE
750.070 LG
LARGE O-RING
750.061
IMPELLER
750.059
WASHER, IMPELLER
750.012M
SS SEAL
750.0414
BRACKET
750.030 LG
HARDWARE KIT
750.502
SLINGER
750.010
Note: These part numbers are only for standard
models within the Valuflo™ 750 series.
WARNING: DO NOT RUN DRY!
WARNING: ALWAYS SHUT OFF ELECTRICAL POWER BEFORE INSTALLATION AND / OR SERVICING THIS PUMP! ALL ELECTRICAL WIRING SHOULD
MEET STATE AND LOCAL ORDINANCES.
NOTE: THE PUMP MOTOR IS DESIGNED FOR 115 VAC 60HZ POWER ONLY! WARNING: SHUT OFF ELECTRICAL
POWER BEFORE INSTALLATION AND / OR SERVICING THIS PUMP! 230V 50HZ MOTORS AVAILABLE - CONTACT YOUR SUPPLIER FOR INFORMATION.
SLINGER
ValuFlo
750
ValuFlo
750
2.19
2” INLET
FNPT
1.5” FNPT
DISCHARGE
0.25” DRAIN PORT FNPT (PLUGGED)
Motor illustration is for reference only.
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