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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

977K will not turn

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Grayhead

07-06-2007 12:02:11




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Can anyone tell me why this cat will not turn after it gets warm. Runs great when cool, also turns, I have ajusted
Brakes what am I missing




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Bob/Ont

07-06-2007 19:13:03




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 Re: 977K will not turn in reply to Grayhead, 07-06-2007 12:02:11  
The steering clutch release pressure is from the trans pump. You have a leak or worn out pump. If you could keep on operating you would also notice torque convertor over heating problems too.
Most common cause and cheapest to fix is the two yellow orings on the sleeve feeding pump flow into the trans valve. Clean of the top of the trans, remove cover and start the machine, look for a big spray of oil coming from the RH rear corner of the trans under the cover plate at the steel sleeve. If you find this take off the external elbow and line to steering valve pull sleeve out and replace seals. If that doesn't fix it pull off the trans pump and check it out. If it's worn come on back and we will talk more.
Later Bob

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AJK

07-06-2007 15:57:14




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 Re: 977K will not turn in reply to Grayhead, 07-06-2007 12:02:11  
The steering clutches are hydraulically operated and it sounds you have not a enough pressure when the oil is hot,a pressure test is in order.
AJ



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