Cat’s title for this part is short: Fixed Displacement Motor. It is the fan motor on the 980H, and the reason it deserves its own page is that on this loader the fan circuit has both a piston pump and a piston motor, and workshops routinely order the wrong half.<\/p>\n
Caterpillar lists 255-6805 as a fixed displacement motor. Trade parts data and the manufacturer’s own internal listing attach it to the 980G and 980H wheel loader family, in the hydraulic fan position. Cat does not publish a displacement, pressure or flow figure for this number, so none is quoted here; if you are sizing a substitute from data sheets rather than from the removed unit, that is a reason to slow down, not a reason to guess.<\/p>\n
The 980H in Cat’s parts literature covers machine prefixes MHG, KZL, JMS and PF8 with the Cat C15 engine, and the 980G entries at 2SR and 2KR relate to repower and emissions configurations of the same size class. Read the plate on your old motor before ordering, because the 980G and 980H do not share every cooling component.<\/p>\n
On a 980H the fan circuit is a pair. 235-2716<\/strong> is the variable displacement fan pump; 255-6805<\/strong> is this fixed displacement motor. The pump decides how much oil the fan gets. The motor converts it into shaft speed. If the machine has been run hot for a season, the oil that circulated through it has almost certainly carried debris from whichever unit failed first, and fitting a clean new motor into that oil is how a second failure is booked against the wrong part.<\/p>\n The practical rule we give workshops: measure before you buy, and if the old motor failed by shedding material, replace the pump in the same visit and flush the circuit. Our guida alla diagnosi del motore ventilatore idraulico<\/a> e guida alla diagnosi della pompa del ventilatore<\/a> cover both tests, and the mating pump is on our 235-2716 page<\/a>.<\/p>\n Match shaft form, flange and port orientation against the removed unit. Prime the casing with clean oil before the first crank. Fit a new return filter element and clear the suction strainer, holding cleanliness around ISO 4406 18\/16\/13 in line with Bosch Rexroth guidance for piston units in mobile service. Confirm rotation with the fan restrained before the guard goes back, then prove full fan speed under thermal load and log coolant and hydraulic oil temperatures.<\/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. Payment by L\/C, T\/T, PayPal or Western Union. The rest of the CAT cooling drive range is under Motore idraulico ventola Caterpillar<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Parte:<\/strong> motore idraulico della ventola 255-6805 per pale gommate CAT 980G e 980H, elencato da Caterpillar come motore a cilindrata fissa.<\/p>\n Ruolo:<\/strong> \u00e8 il lato di lavoro del circuito della ventola di raffreddamento sul 980H. La pompa che lo aziona \u00e8 la 235-2716, e i due si guastano per ragioni diverse.<\/p>\n Fornita come:<\/strong> ricambio nuovo di marca HTD, prodotto in Cina. MOQ 1 pezzo, cassa in legno, spedizione in 5-8 giorni lavorativi.<\/p>","protected":false},"featured_media":4447,"template":"","meta":[],"product_brand":[],"product_cat":[599,37],"product_tag":[678,661,679,54,552,680],"class_list":["post-4494","product","type-product","status-publish","has-post-thumbnail","product_cat-caterpillar-fan-motor","product_cat-hydraulic-fan-motor","product_tag-255-6805","product_tag-cat-980g","product_tag-cat-980h","product_tag-caterpillar","product_tag-fan-motor","product_tag-wheel-loader","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/product\/4494","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/media\/4447"}],"wp:attachment":[{"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/media?parent=4494"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/product_brand?post=4494"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/product_cat?post=4494"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.hongtengdaparts.com\/it\/wp-json\/wp\/v2\/product_tag?post=4494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Diagnosis in the yard<\/h2>\n
\n
Montaggio<\/h2>\n
Condizioni<\/h2>\n