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Farmall & IHC Tractors Discussion Board

Re: 656 hydraulic control valve - what will I be reparing?


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Posted by pete 23 on February 16, 2009 at 10:14:19 from (173.87.1.12):

In Reply to: 656 hydraulic control valve - what will I be reparing? posted by sco 656 on February 16, 2009 at 08:15:41:

It is difficult to tell some one how to take these apart online. It is quite simple but if you don't do it in the correct sequence you will never get the detent balls etc in place . There is a little detent piston inside with an even smaller o-ring on it(it is so small IH sells the piston with the o-ring right on it as it is very difficult to install). That is most likely what is leaking. There are three more o-rings in valve also. . You can unhook the lever from the front of valve spool and unscrew the large cap from the rear, if whole detent tube comes along you are in bussiness, gently pull entire spool out to rear. If the threaded cap comes loose, and detent tube doesn't you may be able to get a hold of it with a pipe wrench and loosen that part. The valves are so close together you may need to devise a different method of getting it loose. Take the spool assembly to someone familiar with their disassembly and repair.
Caution, do not attempt to over tighten the large plug to make detent tube loosen with plug. Had a customer do that once, broke valve.


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