{"id":12971,"date":"2021-05-10T13:03:15","date_gmt":"2021-05-10T13:03:15","guid":{"rendered":"https:\/\/gardentoolspares.com\/?post_type=product&#038;p=12971"},"modified":"2026-05-29T09:55:59","modified_gmt":"2026-05-29T09:55:59","slug":"echo-cs3500-cs3700-cs4400-cs5100-oil-drive-pump-worm-gear","status":"publish","type":"product","link":"https:\/\/gardengeniusparts.com\/gtstest\/product\/echo-cs3500-cs3700-cs4400-cs5100-oil-drive-pump-worm-gear\/","title":{"rendered":"ECHO CS3500 CS3700 CS4400 CS5100 Oil Drive Pump &amp; Worm Gear"},"content":{"rendered":"<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Oil drive pump and worm gear<\/strong> fits <strong>Echo CS3500<\/strong>, <strong>CS3700<\/strong>, <strong>CS4400<\/strong> and <strong>CS5100<\/strong> chainsaws. Supplied as a matched set \u2014 the <strong>oil pump<\/strong> body and the <strong>worm gear<\/strong> that drives it are replaced together, which is the recommended approach when <strong>oil starvation<\/strong> is diagnosed on these saws. The <strong>worm gear<\/strong> sits on the <strong>crankshaft<\/strong> and meshes with the <strong>pump rotor<\/strong> to deliver a continuous flow of <strong>bar and chain oil<\/strong> to the <strong>guide bar<\/strong> groove during cutting. Either component failing in isolation produces the same symptom a dry bar despite a full <strong>oil tank<\/strong> \u2014 so replacing both as a set eliminates the need to diagnose which part has failed and prevents a worn gear from accelerating wear on a new pump body. Fitting a replacement set restores full <strong>chain lubrication<\/strong> and protects the <strong>guide bar<\/strong> and <strong>cutting chain<\/strong> from heat damage.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Fits the following Echo models:<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Echo CS3500<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Echo CS3700<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Echo CS4400<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Echo CS5100<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><strong>Oil drive pump <\/strong>and <strong>worm gear<\/strong> fits <strong>Echo CS3500<\/strong>, <strong>CS3700<\/strong>, <strong>CS4400<\/strong> and <strong>CS5100<\/strong> chainsaws. A matched replacement set that restores full <strong>chain lubrication<\/strong> when <strong>oil starvation<\/strong> is diagnosed replacing both components together eliminates the need to diagnose which part has failed.<\/p>\n","protected":false},"featured_media":19020,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[55,86],"product_tag":[389,1059,224,4100,4101,4102,4103,416,4538,420,394,417,419],"class_list":["post-12971","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-chainsaw-parts","product_cat-oil-pumps","product_tag-assembly","product_tag-assy","product_tag-chainsaw","product_tag-cs3500","product_tag-cs3700","product_tag-cs4400","product_tag-cs5100","product_tag-drive","product_tag-echo","product_tag-gear","product_tag-oil","product_tag-pump","product_tag-worm"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ECHO CS3500 CS3700 CS4400 CS5100 OIL DRIVE PUMP &amp; 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