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Few questions about 656 gasser

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JBlavl

04-25-2005 05:08:45

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So this weekend I looked at a 656 gasser a guy in PA is trying to sell. The paint was faded and the metal was somewhat straight nothing that wasn't fixable. I drove it around and it works real well except for a few things. The hydraulic pump whines pretty good and all the hydraulics are really slow. I was guessing that it was just low on fluid, because when you worked the 3pt the whine stopped, it was just really slow. The other troublesome part was that the TA didn't seem to work. Could this be due to the low hydraulic fluid by any chance? I have no clue how they work just heard they are expensive to fix. You could push the lever back and forth while both moving and stopped and it wouldn't do a thing as far as speed is concerned. (I only did it in 1st and 2nd gear) Another thing I noticed was that the hour meter read 0104.3 and it did work because it went to 0104.4 while I was running it. Therefore I am guessing it must have 10,000+ hours on it. From what I have read that is a lot of hours on a gas engine, and this guy has no idea if it was ever rebuilt. It didn't smoke at all but you could hear a couple rockers smacking valves. So with all that said does this sound like it would be a pain to fix and get to a really good operational tractor? I have mostly worked on letter series and have very little knowledge on these big boys so any input would be greatly appreciated. One last thing the engine casting code was 5.27.L any idea what year this is? Thanks in advance

Josh

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Allan in NE

04-25-2005 05:57:37

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Re: Few questions about 656 gasser in reply to JBlavl, 04-25-2005 05:08:45

Josh,

If it were I, the first order of business would be to change that hydraulic filter and change the hydraulic oil. I'm thinkin' this will put a stop to the whining.

Nope, something is wrong with the T/A and it is fully mechanical; no hydraulics used.

Hope ya get 'er figured out,

Allan

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dhermesc

04-25-2005 05:41:18

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Re: Few questions about 656 gasser in reply to JBlavl, 04-25-2005 05:08:45

Try the TA out in road gear, that will give you a pretty good lug to try it out. The hydraulic whine is common, our 1967 model has the same one and has since the mid 70s. The slow action is an issue. The filter & fluid might need to be replace or as you suspect the pump might need to be overhauled.

The unit can easily have over 10,000 hours (with overhaul). They are getting close to 40 years old, even light usuage of 500 hours a year means more then 20,000 total.

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ed1

04-25-2005 08:56:37

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Re: Few questions about 656 gasser in reply to dhermesc, 04-25-2005 05:41:18

My 686 had the same hyd problem - I added an extra gallon of hy-tran and it went away. The tractor had this noise since it was new and 25 + years later and thousands of hours you can still hear the noise when the oil level drops. Never caused a failure though.

This tractor has a mechanical clutch that controles the TA. Drive the tractor down the road and turn off the engine. If the tractor keeps going with out turning the engine over then ist's most likely the TA clutch. Clutch parts are fairly cheep. The difficult part is that you have to split the tractor to get at it.

Ed Z.

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