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Series 20 Positive Displacement Rotary Pumps

Instruction Manual

Page 1 · Page 2 · Page 3 · Troubleshooting
The following is an excerpt from the Series 20 positive displacement rotary pump manual. For complete installation instructions, please download the full Series 20 Manual (PDF Download, 2.6 MB)

MODEL 20DV, 20CPV VARIABLE VOLUME PUMP, 20DX, 20CPX, BYPASS HEAD PUMP, 20D, 20CP SOLID HEAD PUMP RATED 20 GPM @ 1140RPM (MAXIMUM RATING 30 GPM @ 1800 RPM)

PUTTING PUMP INTO SERVICE

CAUTION: When receiving pump, carefully check for damage, broken port seals, and misalignment incurred during shipping.

CORRECT PIPING HOOK-UP: The series 20 pump comes with two 1 1/2" N.P.T. ports (1 1/4" optional) designed for use with schedule 40 steel pipe. Connect piping based on direction of shaft rotation.

SERIES 20 CW (CLOCKWISE) rotation pump has the suction port on the right side and discharge port on top (VIEWED WITH SHAFT END TOWARDS YOU), and indicated by arrows cast into body.

SERIES 20CCW (COUNTER CLOCKWISE) rotation pump has the suction port on the left side and discharge on top.

  • Any pump may be run in reverse temporarily for such purposes as stripping lines etc.
    WARNING: CAVITATION COULD ENSUE


                    

MOUNTING AND ALIGNMENT

The following could cause misalignment:

  1. Warped base plate (correct by shimming pump and drive components)
  2. Pipe strain (correct by using hangers or appropriate pipe supports)

If pump is connected to drive member by couplings, shim components until coupling halves are aligned.

To prevent misalignment of pump and drive components, fasten base securely in place using the foundation bolt holes provided.

  • SHAFT SHOULD ALWAYS BE TURNABLE BY HAND
  • As a last check before starting pump: remove gland nuts and slide packing gland out of housing. If gland does not slide into housing without interference, pump and drive shafts are misaligned.

DIRECT MOTOR DRIVE "(M/S and M)" UNITS and Closed Coupled "(CFM)" UNITS: Abutting shafts must be at least 1/8 of an inch apart and coupling inserts and/or chains should be loose enough to prevent end thrust on pump shaft. We recommend couplings with metal inserts, not rubber or plastic.

BELT DRIVEN "(BD)" UNITS and OPEN GEAR "(MO)" UNITS: An outboard bearing must be used to prevent side thrust on pump shaft. Pump shaft must be free to slide longitudinally through outboard bearing, so that rotor group will not be forced against pump case components. For BD units, align sheaves using straight edge or stretched cord. For MO units, proper alignment and engagement of gear and pinion can be checked by passing foil or cellophane through them. CAUTION: Use gear and pinion set of same pressure angle else fibre motor pinion life will be short.

NOTE: WE ARE NOT RESPONSIBLE FOR ANY ITEM NOT OF OUR MANUFACTURE.

PACKING GLAND

The packing gland serves a dual function; first as packing follower and second as a bearing which, with the shaft housing bushing, forms a support for the rotor and shaft. As shipped from the factory the gland is LOOSE ENOUGH TO BE ROCKED BY HAND. At first startup DO NOT tighten gland until pump has run long enough for packing to expand from absorption of pumpage. Thereafter, to adjust, tighten nuts evenly one-quarter turn at a time and adjust enough to reduce leakage - NO MORE - a drop or two of the pumpage should normally drip from the gland every few minutes (except, of course, with mechanical seals or external scavenging systems.) SHAFT SHOULD ALWAYS BE TURNABLE BY HAND. LUBRICATE SHAFT, THROUGH FITTING PROVIDED, WHILE PUMP IS UNDER OPERATING PRESSURE A MINIMUM OF EVERY 8 HOURS DURING NORMAL OPERATION. This applies for pumps with Zero Leak Packings or Mechanical Seals to prevent forcing the lubricant back through the packing or seal. For pumps with Food Grade Packing, use only FDA approved lubricant.

  1. Solid Head
  2. Shuttle Pin
  3. Dowel Pin
  4. Solid Head Bolt
  5. Lockwasher
  6. Rotor
  7. Rotor
  8. Piston
  9. Shuttle
  10. Solid Head Gasket
  11. Body Bolt
  12. Body
  13. Pipe Plug
  14. Gland Stud
  15. Gland Stud Nuts
  16. Packing Rings/5 Ring
  17. Packing Gland
  18. Grease Fitting

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