{"id":4634,"date":"2026-10-27T02:16:26","date_gmt":"2026-10-27T02:16:26","guid":{"rendered":"https:\/\/www.hongtengdaparts.com\/product\/komatsu-708-1t-00421-fan-pump-d275a-5d\/"},"modified":"2026-10-27T02:16:26","modified_gmt":"2026-10-27T02:16:26","slug":"komatsu-708-1t-00421-fan-pump-d275a-5d","status":"publish","type":"product","link":"https:\/\/www.hongtengdaparts.com\/de\/product\/komatsu-708-1t-00421-fan-pump-d275a-5d\/","title":{"rendered":"708-1T-00421 L\u00fcfterpumpe f\u00fcr Komatsu D275A-5D Planierraupe, auch 708-1T-00420"},"content":{"rendered":"<p>Two part numbers, one machine, no published supersession. That is the honest summary of 708-1T-00420 and 708-1T-00421, and it is the kind of situation where a confident catalogue is more dangerous than a cautious one.<\/p>\n<h2>What the sources show<\/h2>\n<p>EPC-derived parts data lists a fan pump assembly for the Komatsu D275A-5D under both numbers, with one source recording the applicability as D275A-5D from serial 25001 upward against a specific build specification. Komatsu&#8217;s own online parts catalogue does not return an entry we can cite for either number, so the item name could not be confirmed first-party, and no source we found states that one replaces the other. What we can say: both sit in Komatsu&#8217;s 708-1T pump group, and the rest of that group is published as Pump Assembly.<\/p>\n<h2>How we handle it<\/h2>\n<p>We publish one page rather than two competing ones, because two pages claiming the same machine would split the ranking signal and, worse, invite the wrong order. When an enquiry arrives we ask for two things: a photograph of the number cast on the old pump, and the machine serial number. If the parts record for that serial gives 00420, we quote 00420. If it gives 00421, we quote 00421. We do not treat them as interchangeable, and we do not let a customer order on the assumption that they are.<\/p>\n<h2>Diagnosis on a D275A-class dozer<\/h2>\n<ul>\n<li>Clean the core pack first and re-measure temperatures under load.<\/li>\n<li>Measure fan pump output pressure and flow with the oil hot.<\/li>\n<li>Check the fan motor case drain volume before condemning either unit.<\/li>\n<li>Confirm the control signal reaches the pump; a pump never commanded to full stroke mimics wear exactly.<\/li>\n<\/ul>\n<p>Unsere <a href=\"https:\/\/www.hongtengdaparts.com\/de\/diagnose-der-hydraulikpumpe-des-lufters-am-bagger\/\">Diagnoseleitfaden f\u00fcr hydraulische L\u00fcfterpumpen<\/a> sets out the tests, and <a href=\"https:\/\/www.hongtengdaparts.com\/de\/diagnose-des-hydraulikluftermotors-eines-baggers\/\">the fan motor guide<\/a> covers the other half of the circuit.<\/p>\n<h2>Montage<\/h2>\n<p>Match shaft spline, pilot, flange, port positions and control orientation against the removed pump. Prime the casing with clean oil before cranking. Change the return filter element and clear the suction strainer, targeting ISO 4406 18\/16\/13. Keep the case drain unrestricted to tank. Prove full fan speed under load and record both temperatures.<\/p>\n<h2>Bestellung<\/h2>\n<p>Minimum order one piece. Three to six month warranty on new aftermarket units as stated on your proforma invoice. Bench checked and photographed against your order before the wooden case closes, delivery 5 to 8 working days from payment subject to stock. The D155-6 fan pump is <a href=\"https:\/\/www.hongtengdaparts.com\/de\/produkt\/komatsu-708-1t-00472-fan-pump-d155-6\/\">708-1T-00472<\/a>; die Reihe befindet sich unter <a href=\"https:\/\/www.hongtengdaparts.com\/de\/produkt-kategorie\/hydraulischer-geblasemotor\/komatsu-fan-motor\/\">Komatsu Hydraulik-L\u00fcftermotor<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p><strong>Teil:<\/strong> 708-1T-00421 Hydraulikl\u00fcfterpumpe f\u00fcr den Komatsu D275A-5D Kettendozer, wobei 708-1T-00420 f\u00fcr dieselbe Maschine in EPC-abgeleiteten Teiledaten aufgef\u00fchrt ist.<\/p>\n<p><strong>Vor der Bestellung lesen:<\/strong> Die beiden Nummern sind mit hoher Wahrscheinlichkeit ein Revisionspaar und keine zwei austauschbaren Optionen, und keine Quelle dokumentiert eine Nachfolgekette. Wir liefern anhand Ihres Typenschildfotos.<\/p>\n<p><strong>Geliefert als:<\/strong> neuwertiger Ersatz in HTD-Markenqualit\u00e4t, hergestellt in China. MOQ 1 St\u00fcck, Holzkiste, Versand in 5 bis 8 Werktagen.<\/p>","protected":false},"featured_media":4603,"template":"","meta":[],"product_brand":[],"product_cat":[772,37],"product_tag":[805,804,785,555,806],"class_list":["post-4634","product","type-product","status-publish","has-post-thumbnail","product_cat-komatsu-fan-motor","product_cat-hydraulic-fan-motor","product_tag-708-1t-00420","product_tag-708-1t-00421","product_tag-dozer","product_tag-fan-pump","product_tag-komatsu-d275a-5d","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/product\/4634","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/media\/4603"}],"wp:attachment":[{"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/media?parent=4634"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/product_brand?post=4634"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/product_cat?post=4634"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/de\/wp-json\/wp\/v2\/product_tag?post=4634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}