You will want to look your pump over very carefully and get acquainted with the pump prior to starting. Also refer to “Operating Instructions and Maintenance Suggestions” or “Operators Manual” published by WGI for the specific pump type and model.



Safety Precautions

  1. Never start or operate a pump against a closed discharge line. Catastrophic destruction of piping or pump will promptly occur.
  2. Avoid starting against a full discharge load. Bring pump up to speed using a bypass, then gradually place pump on line.
  3. Bleed air from pump and piping before starting pump.
  4. The cradle cover must be in place while pump is running.
  5. Stand clear of pump while operating under pressure.
  6. Do not operate pump above “maximum design pressure” indicated on metal tag. Operating above the maximum design pressure will result in damage to pump, person or property. Notify WGI at the first sign of a suspected malfunction.
  7. Contact WGI immediately if operating conditions or type of service change. Upon request you can receive recommendations to meet the new specifications and a new application tag can be sent.



Before starting a WGI reciprocating pump.

  1. Packing for piston and plunger pumps:
    • Piston Pumps – Piston pump stuffing boxes are not packed when shipped from the factory. These pumps must be packed before starting. If the pump is to be placed in storage before use, the piston rods should be coated with grease to prevent rusting. See the Pump Storage section for other steps to take before placing pump in storage.
    • Plunger Pumps – These pumps are packed prior to shipment for immediate service. If temporary storage is intended, the plunger must be protected by taking the following steps: rotate the crankshaft slightly more than one revolution, and apply a film of oil to each plunger surface as the plunger moves out of and into the stuffing box packing. Change the position of the plungers periodically/or at least once a week and reapply oil onto each plunger. These steps will help prevent pitting of the plunger from chemical reactions between the packing and the metal surface of the plunger, during periods of inactivity. See Pumps Storage section for more information.
  2. Crankcase has been drained by WGI before shipping pump to you. Fill with lubricant as recommended by operating instructions to ensure proper lubrication of gears, chain, crossheads, connecting rods and shaft bearings. Then rotate the crankshaft by hand at least once a week until starting in order to avoid rust formation from water condensation on unpainted internal parts. Shaft bearings requiring a separate oil bath have been filled at factory with recommended lubricant but should be checked for proper oil level before starting. Check oil levels daily. Change lubricant at least every six months. Drain and thoroughly flush the crank case and bearing housings when making this change.
  3. Pump must set level for proper lubrication and alignment.
  4. Read Operating Instructions and Maintenance Suggestions or Operator Manual for the specific pump model. If misplaced or lost, please contact your nearest WGI distributor or contact WGI direct for a copy.
  5. A pressure relief valve must be installed in the discharge piping between the pump and any other pipe fittings. See page 40 set pressure suggestions.
  6. All belt and coupling guards must be firmly in place.
  7. Be sure that all pipe joints and fasteners are definitely tight before putting the pump into operation.
  8. Check connecting rod bearings for proper adjustment – according to operating instructions.
  9. Check main bearings for proper adjustment – according to operating instructions.


Warnings After starting a WGI reciprocating pump.

    1. New non-adjustable lip type packing rings (plunger pumps only) may be expected to leak slightly for a day or so, but will gradually seat. The packing gland must be retightened and periodically checked after the packing has seated.

      DO NOT attempt to adjust packing while pump is running.


  1. Piston pump packing is available in several different configurations. All are adjustable type packing. Care must be taken to ensure that this packing is not overtightened. On most installations, a very slight drip is desirable to aid in lubrication and as visual proof that the packing is not too tight.
  2. After Two (2) Hours Operation (also refer to Appendix I)
      • a. Check all the crank end connecting rod bearings for proper adjustment. Check connecting rod bolt nut torque and adjust if necessary.
      • b. Check lubricant level and pressure gauge (if forced lubrication system is furnished).