Re: 434/424 tractor - PTO shaft not driving implement

Posted by Hugh MacKay on June 15, 2007 at 18:51:00 from (216.208.58.130):

In Reply to: 434/424 tractor - PTO shaft not driving implement posted by Tony from Sussex on June 15, 2007 at 14:08:04:

Tony: I wouldn't bet on it being same as 424. We discovered here last winter even some of the complete Doncaster built tractors are different in that power train.

Your 434 has a two stage clutch, in other words two discs. Pedal half way down releases the drive clutch and all the way down releases the PTO clutch. For some reason the PTO clutch is not releasing. What happens if you stop tractor engine, engage PTO then start the tractor? Then tell us what happens if you put enough load on PTO to stop it? Will the tractor starter turn it over.

It may be as simple as PTO clutch adjustment, and very likely both clutches have to be adjusted in unison. Do you have a manual showing how to adjust these clutches? If not find one, as IH operators manuals always do a good job on clutch adjustments. I could suggest your clutch is toast, however one should always try the adjustment route before spliting a tractor. If you adjust as per the manual and that doesn't cure the problem, then you may as well split the tractor and be prepared to spend some money. A complete clutch kit for a SA, SC 200 runs about $350. that 434 will be close to double that.

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