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Includes design feature specifications for mechanical seal and packing configurations, plus installation guidance covering mounting position, pre-wetting, piping support, drive alignment, rotation direction, and packing water-flush procedures for 356 models. Provides pump data such as suction/discharge port sizes and discharge pressure, temperature limits for elastomers, operating requirements like self-priming and dry-run prohibition, storage draining, and troubleshooting for failures to pump, overloads, noisy operation, and seal or packing leakage.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/moyno-500-pumps-300-series-331-332-333-344-356-and-367-models-service-manual/653838/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/moyno-500-pumps-300-series-331-332-333-344-356-and-367-models-service-manual/653838.png","ImageObject",300,407,{"name":92,"@type":93},"AditGamingID","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-31","2026-10-25",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How should the pump be mounted to prevent seal leakage into bearings?","Question",{"text":112,"@type":113},"When mounting vertically, keep bearings above seals to prevent possible seal leakage into the bearings.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are the key requirements before starting the pump?",{"text":117,"@type":113},"Wet pump elements and the mechanical seal or packing before connecting. Also ensure the pump rotation is clockwise when facing the shaft and check direction before startup.",{"name":119,"@type":110,"acceptedAnswer":120},"What should be done if the pump fails to pump?",{"text":121,"@type":113},"Check for belt or coupling slip, verify stator condition and discharge pressure, confirm correct clockwise rotation, replace stripped rotor/shaft threads, and review excessive suction lift or vacuum.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},653838,1792940476,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},962094249103,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Section:  \nMOYNO® 500 PUMPS  \nPage: 1 of 8  \nDate: March 1, 1998  \nSERVICE MANUAL  \nMOYNO® 500 PUMPS  \n300 SERIES  \n331, 332, 333, 344, 356 AND 367 MODELS  \nMechanical Seal Models  \nPacking Gland Models  \n\n| DESIGN\u003Cbr>FEATURES | MODELS |  |  |  |  |\n| --- | --- | --- | --- | --- | --- |\n|  | 33101 34401\u003Cbr>33201 35601\u003Cbr>33301 36701 | 33104 34404\u003Cbr>33204 35604\u003Cbr>33304 36704 | 33108 33308\u003Cbr>33208 34408 | 34411\u003Cbr>35611 | 35613 |\n| Housing: | Cast Iron | AISI 316 SS | Nylon | Cast Iron | AISI 316 SS |\n| Pump Rotor: | Chrome plated 416 SS | Chrome plated 316 SS | Chrome plated 416 SS | Chrome plated 416 SS | Chrome plated 316 SS |\n| Pump Stator: | NBR (Nitrile) | NBR (Nitrile) | NBR (Nitrile) | NBR (Nitrile) | NBR (Nitrile) |\n| Shaft: | 416 SS | 316 SS | 416 SS | 416 SS | 316 SS |\n| Flexible Joint: | Carbon steel/ NBR | 316 SS/ NBR | Carbon steel/ NBR | Carbon steel/ NBR | 316 SS/ NBR |\n| Bearings: | Ball (sealed) | Ball (sealed) | Ball (sealed) | Ball (sealed) | Ball (sealed) |\n| Mechanical Seal: | Carbon-ceramic | Carbon-ceramic | Carbon-ceramic | --- | --- |\n| Packing: | --- | --- | --- | Braided PTFE | Braided PTFE |\n\nNote: Alternate elastomers available. Refer to Repair/Conversion kit numbers, page 8.  \nINSTALLATION  \nMounting Position. Pump may be mounted in any position. When mounting vertically, it is necessary to keep bearings above seals to prevent possible seal leakage into bearings.  \nPre-Wetting. Prior to connecting pump, wet pump elements and mechanical seal or packing by adding fluid tobe pumped into suction and discharge ports. Turn shaft over several times in a clockwise direction to work fluid into elements.  \nPiping. Piping to pump should be self-supporting to avoid excessive strain on pump housings. See Table 1 for suction and discharge port sizes of each pump model. Use pipe“dope” or tape to facilitate disassembly and to provide seal.  \nDrive. On belt driven units, adjust belt tension to point of non-slip. Do not overtighten.  \nOn direct drive units, coupling components should be aligned and spaced at least 1/16” apart.  \nPump rotation must be clockwise when facing shaft to prevent damage to pump. Check direction of rotation before startup.  \nWater Flush of Packing (356 Models Only) . The packing may be either grease lubricated through a grease fitting in the stuffing box or have plumbing connected to the housing to allow a water flush.  \nMaximum speed is 1750 rpm.  \nWhen the material being pumped is abrasive in nature, it may be advantageous to flush the packing to prevent leakage under packing and excessive shaft wear.  \nPage 2  \nClean water can be injected through a 1/8” NPT tapped hole that normally houses the grease fitting for lubricating the packing. The water can be permitted to leak axially along the shaft in either direction or can be removed from the second tapped hole in the stuffing box. In both cases, the discharge from the stuffing box should be throttled slightly to maintain 10-15 PSI higher pressure in the stuffing box than is present in the discharge housing.  \nTable 1. Pump Data  \n\n| Pump Models | 331 | 332 | 333 | 344 | 356 | 367 |\n| --- | --- | --- | --- | --- | --- | --- |\n| Suction Port (NPT) | 3/4* | 3/4* | 3/4* | 3/4* | 1-1/2 | 2 |\n| Discharge\u003Cbr>Port (NPT) | 3/4 | 3/4 | 3/4 | 3/4 | 1-1/4 | 2 |\n| Discharge\u003Cbr>Pressure (psig) | 150 | 100 | 50 | 40 | 50 | 50 |\n\n*08 versions = 1” NPT  \nTable 2. Temperature Limits  \n\n| Elastomer | Temperature Limits |\n| --- | --- |\n| *NBR | 10°-160°F |\n| *EPDM | 10°-210°F |\n| *FPM | 10°-240°F |\n\n*NBR = Nitrile  \n*EPDM = Ethylene-Propylene-Diene Terpolymer  \n*FPM = Fluoroelastomer  \nOPERATION  \nSelf-Priming. With wetted pumping elements, the pump is capable of 25 feet of suction lift when operating at 1750 rpm with pipe size equal to port size.  \nDO NOT RUN DRY. Unit depends on liquid pumped for lubrication. For proper lubrication, flow rate should be at least 10% of rated capacity.  \nPressure and Temperature Limits. See Table 1 for maximum discharge pr","cbCaio5hGkADFdyI","https://ap.wps.com/l/cbCaio5hGkADFdyI","pdf",212109,"English","# Installation\n## Mounting Position\n## Pre-Wetting\n## Piping\n## Drive and Rotation\n## Water Flush of Packing (356 Models Only)\n# Operation\n## Self-Priming\n## Pressure and Temperature Limits\n## Storage\n# Troubleshooting\n## Failure To Pump\n## Pump Overloads\n## Noisy Operation\n## Mechanical Seal Leakage\n## Packing Leakage","[{\"question\":\"How should the pump be mounted to prevent seal leakage into bearings?\",\"answer\":\"When mounting vertically, keep bearings above seals to prevent possible seal leakage into the bearings.\"},{\"question\":\"What are the key requirements before starting the pump?\",\"answer\":\"Wet pump elements and the mechanical seal or packing before connecting. Also ensure the pump rotation is clockwise when facing the shaft and check direction before startup.\"},{\"question\":\"What should be done if the pump fails to pump?\",\"answer\":\"Check for belt or coupling slip, verify stator condition and discharge pressure, confirm correct clockwise rotation, replace stripped rotor/shaft threads, and review excessive suction lift or vacuum.\"}]","MOYNO® 500 PUMPS - 300 SERIES - 331, 332, 333, 344, 356 AND 367 MODELS - Service Manual | PDF",1792900590,23]