{"product_id":"samson-pm4-3-1-main-piston-fluid-plunger-kit-734964","title":"Samson PM4 3:1 Main Piston \/ Fluid Plunger Kit #734964","description":"\u003cdiv class=\"gleam-quick-specs\" style=\"background: #f5f5f5; border-radius: 5px; padding: 16px 20px; margin: 0 0 16px 0; font-family: Roboto,sans-serif;\" role=\"region\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #283c92; font-size: 16px; margin: 0 0 12px 0; border-bottom: 2px solid #283c92; padding: 0 0 6px 0;\"\u003eSpecifications\u003c\/div\u003e\n\u003cdiv class=\"gleam-tablewrap\" style=\"overflow-x: auto; margin: 0; padding: 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border-spacing: 0; font-size: 14px; margin: 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 7px 12px; font-weight: 600; color: #283c92; width: 45%;\"\u003eSamson Part #\u003c\/td\u003e\n\u003ctd style=\"padding: 7px 12px;\"\u003e734964\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #eef0f9;\"\u003e\n\u003ctd style=\"padding: 7px 12px; font-weight: 600; color: #283c92;\"\u003eProduct Type\u003c\/td\u003e\n\u003ctd style=\"padding: 7px 12px;\"\u003eMain Piston \/ Fluid Plunger Repair Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 7px 12px; font-weight: 600; color: #283c92;\"\u003ePump Series\u003c\/td\u003e\n\u003ctd style=\"padding: 7px 12px;\"\u003ePumpMaster 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #eef0f9;\"\u003e\n\u003ctd style=\"padding: 7px 12px; font-weight: 600; color: #283c92;\"\u003eFits\u003c\/td\u003e\n\u003ctd style=\"padding: 7px 12px;\"\u003ePM4 3:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 7px 12px; font-weight: 600; color: #283c92;\"\u003eService Area\u003c\/td\u003e\n\u003ctd style=\"padding: 7px 12px;\"\u003eFluid Plunger \/ Central Rod Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gleam-description\" style=\"font-family: Roboto,sans-serif; color: #333; max-width: 900px;\"\u003e\n\u003ch2 style=\"color: #283c92; font-size: 18px; margin-top: 0;\"\u003eSamson PM4 3:1 Main Piston \/ Fluid Plunger Repair Kit #734964\u003c\/h2\u003e\n\u003cp\u003eGenuine Samson repair kit for the PumpMaster 4 3:1 oil pump. Samson currently lists #734964 as the PM4 3:1 Main Piston Kit, while technical service documentation identifies the serviced assembly as the fluid plunger or central bar section.\u003c\/p\u003e\n\u003cp\u003eThe kit is used when servicing the main reciprocating rod\/plunger components that transfer air-motor motion into the pump's fluid section. It is a component-specific repair kit rather than a complete PM4 rebuild package.\u003c\/p\u003e\n\u003cdiv style=\"background: #eef0f9; border-radius: 5px; padding: 16px 20px; margin: 16px 0;\"\u003e\n\u003cp style=\"margin: 0; font-size: 14px;\"\u003eQuestions before ordering? Call \u003ca href=\"tel:+18178653707\" style=\"color: #283c92; font-weight: 600;\"\u003e(817) 865-3707\u003c\/a\u003e and our team will help confirm the correct PM4 3:1 service kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #283c92; font-size: 15px; border-bottom: 2px solid #283c92; padding-bottom: 6px;\"\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px;\"\u003eDesigned for compatible Samson PumpMaster 4 3:1 oil pumps. Because PM4 repair kits are specific to different portions of the pump, verify part #734964 against your service documentation before ordering.\u003c\/p\u003e\n\u003cdiv class=\"gleam-faq\" role=\"region\"\u003e\n\u003ch3 style=\"color: #283c92; font-size: 16px; border-bottom: 2px solid #283c92; padding-bottom: 6px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; border-radius: 5px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003ch3 style=\"background: #eef0f9; color: #283c92; margin: 0; padding: 14px 18px; font-size: 15px;\"\u003eWhat does Samson #734964 service?\u003c\/h3\u003e\n\u003cp style=\"padding: 14px 18px; margin: 0; font-size: 14px; line-height: 1.7; color: #333;\"\u003eIt services the main piston or fluid-plunger\/central-rod portion of compatible PM4 3:1 pumps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; border-radius: 5px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003ch3 style=\"background: #eef0f9; color: #283c92; margin: 0; padding: 14px 18px; font-size: 15px;\"\u003eWhy is it sometimes called a fluid plunger kit?\u003c\/h3\u003e\n\u003cp style=\"padding: 14px 18px; margin: 0; font-size: 14px; line-height: 1.7; color: #333;\"\u003eSamson's current store uses the name Main Piston Kit, while technical SAMOA documentation describes #734964 as the Fluid Plunger or Central Bar Kit. Both references point to the same repair-kit part number.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; border-radius: 5px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003ch3 style=\"background: #eef0f9; color: #283c92; margin: 0; padding: 14px 18px; font-size: 15px;\"\u003eIs this the lower-end kit?\u003c\/h3\u003e\n\u003cp style=\"padding: 14px 18px; margin: 0; font-size: 14px; line-height: 1.7; color: #333;\"\u003eNo. Samson lists #734965 separately for the PM4 3:1 lower-end\/pump-piston service on model #340120.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does Samson #734964 service?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It services the main piston or fluid-plunger\/central-rod portion of compatible PM4 3:1 pumps.\"}},{\"@type\":\"Question\",\"name\":\"Why is it sometimes called a fluid plunger kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Samson's current store uses the name Main Piston Kit, while technical SAMOA documentation describes #734964 as the Fluid Plunger or Central Bar Kit. Both references point to the same repair-kit part number.\"}},{\"@type\":\"Question\",\"name\":\"Is this the lower-end kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Samson lists #734965 separately for the PM4 3:1 lower-end\/pump-piston service on model #340120.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n.gleam-quick-specs .gleam-tablewrap,.gleam-quick-specs .table-wrapper{margin:0!important;padding:0!important;}\n.gleam-quick-specs table{margin:0!important;padding:0!important;border-spacing:0!important;border-collapse:collapse!important;}\n.gleam-quick-specs table tbody,.gleam-quick-specs table tr{margin:0!important;padding:0!important;height:auto!important;}\n.gleam-quick-specs table td,.gleam-quick-specs table th{padding:7px 12px!important;line-height:1.35!important;height:auto!important;vertical-align:middle!important;}\n.gleam-quick-specs{padding:16px 20px!important;margin-bottom:16px!important;}\n\u003c\/style\u003e","brand":"Samson","offers":[{"title":"Default Title","offer_id":53663691964709,"sku":"ALMSAM734964","price":233.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/0037\/9685\/files\/Samson_OEM-Part.jpg?v=1787192936","url":"https:\/\/alamoequipment.com\/products\/samson-pm4-3-1-main-piston-fluid-plunger-kit-734964","provider":"Alamo Equipment Service","version":"1.0","type":"link"}