On the big C-series machines the fan pump is a piston unit rather than a gear pump, which means it can vary its output and can also fail in more ways. This page is deliberately narrow about fitment, because 170-9918 is one of the numbers the trade applies loosely across several tonnage classes.<\/p>\n
170-9918 is listed as a hydraulic piston pump, with the parts book item name PUMP GP-PISTON. That distinguishes it from the gear-type fan pumps used on the smaller C-series machines such as the 325C, where the supply unit is a ten-tooth gear pump. On a 385C or 390D the fan pump is doing variable output work, and its control is where faults start.<\/p>\n
Trade parts data and supplier cross-references attach 170-9918 to CAT 374 and 374D, 385C, 390C and 390D, and to the 5090B, running C18 and 3456 engines.<\/p>\n
What we cannot confirm: listings that put this pump on a 365C or a 385B. The 365C fan pump in Caterpillar’s own numbering is 247-8968, cross-referenced as 10R-6278, and we list it on its own page. If you have been quoted 170-9918 for a 365C, check the number on the old unit before you accept it. We would rather lose the order than ship a pump that will not bolt up.<\/p>\n
A 385C or 390D in the 80 to 90 tonne band rejects a large amount of heat through its cooling package, and the fan is hydraulically driven with speed controlled from coolant and hydraulic oil temperature. The pump’s displacement is varied in response to that demand. Three failure modes follow from that arrangement:<\/p>\n
Test in that order. Our hydraulic fan pump diagnosis guide<\/a> covers flow and delivery pressure measurement, and the regulator article<\/a> covers the control signal. The mating motors in this class are 225-4613 for the 365C and 247-8978 for the 385C and 390D, and they are not interchangeable.<\/p>\n Compare shaft, pilot, bolt pattern and port orientation against the removed unit before cleanup begins. Prime the casing with clean oil before cranking. Fit a new return filter element and clear the suction strainer. Route the case drain directly to tank with no restriction, since back-pressure in the casing is what finishes shaft seals. Confirm the control connector is seated, then prove full fan speed under thermal load and log both temperatures.<\/p>\n Cleanliness target for axial piston units in mobile service is around ISO 4406 18\/16\/13 on Bosch Rexroth guidance. If the machine has already lost a pump, inspect the drive train before fitting: drive gear inspection<\/a> ve transfer case failure diagnosis<\/a> cover what to look for.<\/p>\n Minimum order one piece. New aftermarket units carry a three to six month warranty as stated on your proforma invoice. Bench tested, photographed against your order before the wooden case closes, delivery 5 to 8 working days from payment subject to stock, by sea, air or express courier. Related pages: 247-8968 fan pump<\/a> ve 225-4613 fan motor<\/a>. The full range sits under Caterpillar hydraulic fan motor<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Part:<\/strong> 170-9918 hydraulic fan pump, listed by Caterpillar as a hydraulic piston pump and in parts literature as PUMP GP-PISTON.<\/p>\n Fitment:<\/strong> supplied against 374, 385C, 390C and 390D machines with C18 and 3456 engines, per trade parts data.<\/p>\n Supplied as:<\/strong> new HTD-brand replacement, made in China. MOQ 1 piece, wooden case, dispatch 5 to 8 working days.<\/p>","protected":false},"featured_media":4363,"template":"","meta":[],"product_brand":[],"product_cat":[599,37],"product_tag":[628,629,630,54,555],"class_list":["post-4384","product","type-product","status-publish","has-post-thumbnail","product_cat-caterpillar-fan-motor","product_cat-hydraulic-fan-motor","product_tag-170-9918","product_tag-cat-385c","product_tag-cat-390d","product_tag-caterpillar","product_tag-fan-pump","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/product\/4384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/media\/4363"}],"wp:attachment":[{"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/media?parent=4384"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/product_brand?post=4384"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/product_cat?post=4384"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/tr\/wp-json\/wp\/v2\/product_tag?post=4384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Fitting notes<\/h2>\n
Terms<\/h2>\n