US Filtermaxx

Leg Type Centrifuge Assemby

WMO centrifuge for Waste Oil Cleaning by US Filtermaxx

Thank you for purchasing a US Filtermaxx centrifuge.

Handling of fuels and rotating machinery is hazardous. Follow all applicable ordinances regarding handling and storage of fuels, equipment grounding and disposal of centrifuge waste. Filtermaxx LLC is not liable for unlawful use or disposal of waste products.

Please read and understand these instructions before use.


Filtermaxx LLC will repair or replace any part deemed to be defective by Filtermaxx LLC for one year from the date of purchase. Defective parts must be returned to Filtermaxx LLC for inspection. Judgement by Filtermaxx LLC is final. Warranty does not cover shipping charges to or from the Filtermaxx facility.  Filtermaxx LLC does not guarantee this product is suitable for any purpose what so ever and is not responsible for any loss or damage from use of this product. Filtermaxx LLC is liable for replacement of defective parts only.



Engineering inquires:

 US Filtermaxx LLC

PO Box 600711

Jacksonville Fl 32260 


 This Manual Contains Copyrighted Material. Used With Permission.


Electrical Requirements 


All motors start best on 240 volts and this is the preferred voltage. 


3/4 hp motors are usually wired for 120 volts.


All other motors are wired for 240 volts.


Motors may be rewired for different voltage as seen on page 9 of the Manual




Due to the high starting current, extension cords cause the staring capacitors to over heat, burning up the motor. This condition is NOT covered by warranty. 




Motor Currents amps @ 120/240 v

                                                 HP                No Load                    Full Load            Locked Rotor

                                                 3/4               7.34 / 3.67                  11 / 5.5                  55 / 32


                                                   1                9.06 / 4.53                 13.6 / 6.8                75 / 43


                                                 1.5              10.14 / 5.07                 15.2 / 7.6              120 / 65

Centrifuge Parts: 


WMO oil Centrifue parts 1               WMO oil centrifuge parts 2                                 WMO Oil Centrifuge parts 3                                                                                                     

.WMO Centrifuge Parts 3

Back view


                                   1. Wrap the motormount stud  and leg bolts with at least 8 turns of teflon tape.

Motor mount bolts


                                  2. Insert Motor mount stud into centrifuge base and tighten using a vise grip

Install motor mount stud

                                 3. Attach legs with ½ inch bolts and lock washers.

Tighten leg bolts

                                4. Tighten Leg bolts.

Tighten bolts


                                5. Set motor mount plate on motor as shown.

motor mount set in place


                                   6. Insert three 3/8-16 bolts with flat washers and lock washers. Tighten Bolts.

Tighten motor bolts

                                 7. Place a shim over the bolts. Folded card stock like junk mail works well.

Pulley Shim


                               8. Press the pulley down until it just touches card stock. Tighten Set screw. Remove

                                card stock. Do not hammer the cast iron pulley. This is a tight fit. However small burrs

                                may make this very tight and should be removed with a file.

Pulley tighten


                                9. Wire motor for 120 or 240 volts as needed. Use 14 ga wire for 240 volts. Use  12 ga wire for 120 volts.







10. Attach belt tensioning arm and bolt as seen in “Back” photo

 “fan end”  like when attaching the pulley.

 12. Pick up centrifuge and set the centrifuge over the motor, inserting the motor   mount stud through the ½ inch diameter motor mount bolt hole.

 13. Raise the motor and Insert a block of wood under it so that the ½ inch nut, lock washer and flat washer may be put on the stud. Tighten the nut so that the motor mount boss touches the centrifuge base.

 14. Attach the belt over the small pulley.

 15. Take up the slack in the belt using the belt tightening screw. The belt should be snug with about 1/4 inch deflection at 10 pounds pressure A loose belt will slip on the pulley causing the spindle to overheat.

 16. Grasp the motor pulley and rotate it, spinning the bowl by hand to be sure that it turns freely. Tighten the motor mount bolt.

 DO NOT Disassemble Bowl.  This destroys the precision balance.



The centrifuge must NOT be hard mounted. This will tune the centrifuge legs to a natural frequency causing extreme vibration.  It is best mounted on rubber pads or vibration isolators available at

Vibration Isolator


 If vibration isolators are not available, the centrifuge may be mounted on a rubber pad as seen on the left.

The centrifuge must be free to move on the mounting and not tightly bolted to the surface.



  1. Rattles or Vibration:


    Loose spindle               Tighten spindle lock


    Loose Pulleys               Tighten pulley set screws-

    Be careful not to strip the aluminum threads by over     tightening.


    Fan Cover loose            Tighten sheet metal fan cover on motor


    Motor mount loose        Tighten motor mount bolt


    Legs rigidly bolted to      an uneven surface.       Use rubber pads under the legs.


    Tighten only 1 leg bolt leaving the other two only  finger tight. Over tightening can actually “tune” the centrifuge   

  2. to a natural frequency causing severe vibration

  3. 2.  Centrifuge Stutters upon start up: 

  4.      Belt is loose                   Tighten Belt                  


  1. Centrifuge runs for a while then blows breaker upon restart: 


     Breaker too small  or weak.   

     20 amps required for cycling operation. 15 amps may  start and run the centrifuge, but is too small for restart.

Centrifuge will not start

  1. Bowl jammed               Remove jam. Reposition bowl so that it spins freely 

  2. Circuit breaker blown  Determine cause of blown breaker, then reset.  

    Motor and capacitor heat up upon starting. No more than 4 starts per hour allow capacitor to cool between starts.

         Capacitor bad              

    Capacitor oil leaks out upon over heating. Replace   capacitor. This is a sign of undersize wire or overload.


    5. Motor runs hot :      Bowl Dragging. Check clearance at spindle.

                                         Centrifuge is flooding. Feed rate too high. Drain

                                          Clogged or undersized. 1 inch minimum hose  diameter

  3. See Technical Articles at USFiltermaxx.Com for further information.