[Ford-ferguson] Problem with 601 Workmaster

[Jack Massimino]

Hi all,  I have been on the list for a few months and have enjoyed reading 
everything on here so far.  I am new to having one of the types of 
tractor.  I purchased this in December of 05.  Now to my problem.  When I 
got the tractor it ran great.  Then at the beginning of June I was out 
brush hogging one of my fields and it started running real rough and was 
acting like it was running out of gas.  I checked the tank and it seemed 
fine.  I got it back to the barn just barely and shut it down so I could go 
look at my manuals.  About an hour later I started it back up and it ran 
great again.  After it warmed up it again started acting up.  I checked the 
filter and it seemed clean but I replaced it anyway and then I took the 
drain out of the carb and made sure it was running gas out and no dirt.  It 
all looked good.  I called the local tractor place that I bought it from 
and they came and got it.  I was told it was the carb and needed to be 
rebuilt.  They did and brought it back.  It did exactly the same thing so 
back they came and back to the shop.  I was told that the guy who rebuilt 
it didn't do it right and the head guy re-did it.  No charge this time as 
it should be.  They even took it out and did some brush hogging at their 
place for about an hour.  It was running great.  I got it back and was able 
to hog my field and did so twice so far.  Now today, I went out to do some 
hogging and it started doing the same thing after it got a little warm.  I 
am at a loss.  I know almost nothing about Fords and am at a loss as to 
where to go from here.  Any help will be very greatly appreciated.

Jack in Michigan