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Farmall & IHC Tractors Discussion Forum
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HELP----656 Hyd Problems

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Wayne from Iowa

08-31-2007 06:17:42




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My 656 gear tractor Hyd. squeals like the by-pass valve is stuck or it is starving for oil. I have changed the hy-tran and new hyd filter and did not help. Yesterday mowing hay I almost lost steering and the fast hitch would hardly go up or down. Any help would really be appreciated to fix this. Thanks




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GD720D

09-01-2007 11:05:28




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 Re: HELP----656 Hyd Problems in reply to Wayne from Iowa, 08-31-2007 06:17:42  
Chuck is right about the rubber hose on the suction line.But the steel pipe on the uppper end of the rubber hose has been know to crack where it is welded into the mounting plate above the ring gear. If the hose is in good shape take a mirror and light and check real close where the pipe goes into the plate for a crack. Also the 656 has had the mounting bracket on the big suction tube break off. The bracket is welded to the pipe and is bolted to the pinion bearing retainer. Grap the end of the suction tube and try to move it back and forth. I if it moves the weld is broke and the tube has slid back coming out of the o-ring that seals it between the trans housing and the T.A. housing. Would have to split tractor and remove rear deck lid to repair. Can add about 5 gallons of oil and runb tractor. If noise quits chances are that the weld has broken and is sucking air around the o-ring.

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Chuck's Repair

08-31-2007 19:25:34




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 Re: HELP----656 Hyd Problems in reply to Wayne from Iowa, 08-31-2007 06:17:42  
There is a return hose that dumps Hy-tran back into the suction tube in the final drive housing.If that has a hole in it air can inter the system and cause the squeeling and loss of pressure.Take the upper link plate off and visually check that hose.



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Janicholson

08-31-2007 17:01:03




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 Re: HELP----656 Hyd Problems in reply to Wayne from Iowa, 08-31-2007 06:17:42  
If one of the valves is misadjusted so that it is not in neutral, it will act like a lever is just moved a bit, and it will overheat the system, and bog the engine down some. A stuck relief valve is also possible. caseih.com has parts diagrams on line. JimN



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