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PREVENTATIVE MAINTENANCE
TECHNICAL SERVICE MANUAL - TM-5-3895-374-24-2_575

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 RAPID WEAR CAUSE EVIDENCE POSSIBLE SOLUTION 1 Abrasives Gouges or marks made by large.  hard parti- Flush the system with the pump removed.  Install cles; a rapid wearing away of bushings from strainer in suction line.  Oftentimes after a system has very small abrasives similar to pumice; or run for a few cycles or a few days the dirt is pretty well anything in between. cleaned out and if the pump is rebuilt into good condition it will then last for a long time. 2 Corrosion Rust, general overall aggressive attack or Check the Viking General Catalog Liquid List for sloughing off a metal. materials of construction recommendation.  Consider whether all of the materials used in pump construc- tion were attacked: consider other materials used in the system to determine how they resisted the liquid. Check to see whether or not the liquid has been contaminated to make it more corrosive than antici- pated. 3.  Exceeding operating Noisy operation, broken bushings, twisted Review General Catalog for operating limits on par- limits shaft, parts show evidence of high heat. ticular model involved. 4.  Insufficient extra Pump may stall.  Evidence of heavy contact Increase end clearance and/or contact your distrib- clearance between end of rotor teeth and head or other utor or the factory with details of the application so parts. that information regarding proper extra clearance may be provided. 5.  Lack of lubrication Noisy bearings, localized heating at bearings Be sure all zerks are greased before starting and or lip seal, smoke, rapid bushing wear. instructions for lubrication of drive equipment are followed: consider use of auxiliary lubricating equip- ment. 6.  Misalignment Wear on only one part of a surface, e.g., one Double check alignment of drive equipment and side of the casing, one side of the packing piping.  Check the alignment under conditions as gland, only a portion of the face of the head. close to operating conditions as possible. 7.  Run dry Pump stalls because parts have uneven ex- Be sure there is liquid in the system at the time of start pansion caused by frictional heat; galling up.  Provide some kind of automatic alarm or shut-off between surfaces having relative motion; if supply tank runs dry. seal seats and idler pins changing color be- cause of high heat. DO’S AND DON’TS Do’s and Don’ts for installation, operation, and maintenance of Viking pumps to assure safe, long, trouble-free operation. Installation - 1. Do install pump as close to supply tank as possible. 2. Do leave working space around the pumping unit. 3. Do use large, short, and straight suction piping. 4. Do install a strainer in the suction line. 5. Do  double  check  alignment  after  the  unit  is  mounted  and piping is hooked up. 6. Do  provide  a  pressure  relief  valve  for  the  discharge  side  of the pump. 7. Do  cut  out  the  center  of  gaskets  used  as  port  covers  on flanged port pumps. 8. Do  record  pump  model  number  and  serial  number  and  file for future reference. Operation - 1. Don’t run  pump  at  speeds  faster  than  shown  in  the  catalog for your model. 2. Don’t  require  pump  to  develop  pressures  higher  than  those shown in the catalog for your model. 3. Don’t operate pumps at temperatures above or below limits shown in the catalog for your pump. 4. Don’t operate pumps without all guards being in place. 5. Don’t  operate  pump  without  a  pressure  relief  valve  on  the pump  or  in  the  discharge  piping;  be  sure  valve  is  mounted and set correctly. 6. Don’t exceed catalog limits for temperature and pressures of fluids in jacketed areas of pump. page 3 - 1208







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