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Working On The Sears Craftsman Ff\20


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#1 markdombroski OFFLINE  

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Posted August 19, 2012 - 09:32 PM

Last October I picked up a Sears Craftsman FF/20 monster tractor. I picked it up for 200 dollars and seemed to be a pretty good deal as it had some nice AG tires and three point hitch on the back. It didn't run and had been sitting for around 5-10 years under a plastic tarp rusting away. The steering gear is stripped and the steering wheel freewheels and doesn't steer at all.


Here is my original post back in October:
http://gardentractor...onster-tractor/

I knew that I would have to replace the steering and found a part FF/18 for sale last week. I picked it up and it has a good steering gear, Eaton transmission, and hydraulic cylinder.


So, I thought the first thing to do is to see if the engine runs. I took off the air cleaner and checked out the points. The points were rusty and corroded. Also the plunger was frozen stuck in the points base. I had to carefully punch out the plunger and was able to restore it to working order. I am ordering a new points and condenser, but I decided it was no loss to bead-blast the old points, which cleaned up really nice. I replaced the spark plugs and hooked up a temporary gas tank and fuel filter. I hot-wired the ignition and the engine began to turn over.

I had spark, but no fuel. It was the fuel pump that wasn't working, so I bypassed it and made sure that the fuel tank was higher than the carburetor. She started up. I changed the oil and oil filter. Now I know that the engine is going to do well. Just needs a lot of care and cleanup.

Interesting that someone cut holes to open up the side tin. Why wouldn't they just unbolt the tin from the engine. Anyways, there are holes in the left and right sides.

Here is a brief video of the engine running:
http://youtu.be/xEJUXIpuIXQ?hd=1

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Edited by markdombroski, August 20, 2012 - 10:39 AM.

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#2 JDBrian OFFLINE  

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Posted August 20, 2012 - 05:47 AM

Glad to hear you got it going. Are you planning a full restoration? With the 3pt hitch that would be a pretty useful tractor to have around. They made a real mess out of the side covers. Do you think they did that to try to cool the engine?
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#3 Alc ONLINE  

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Posted August 20, 2012 - 05:55 AM

Glad to hear you got her running , those side cover holes do seem strange , wouldn't that make the cooling worse because it would pull air in there instead of around the head or am I thinking wrong , which could be lol , Al
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#4 mjodrey OFFLINE  

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Posted August 20, 2012 - 06:06 AM

Glad to hear that you got it going.
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#5 KennyP ONLINE  

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Posted August 20, 2012 - 06:09 AM

Good to see some close ups of the FF. Looking at the pic again, I think they cut that hole to get to the starter bolts.
In the rear pic, is that a PTO I see in the middle?
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#6 Hugh OFFLINE  

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Posted August 20, 2012 - 10:35 AM

Nice work. That P220g will be tough to beat.

Kenny, I believe they had a 540rpm optional
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#7 markdombroski OFFLINE  

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Posted August 20, 2012 - 10:58 AM

Good to see some close ups of the FF. Looking at the pic again, I think they cut that hole to get to the starter bolts.
In the rear pic, is that a PTO I see in the middle?


Yes, this has a Front and Rear PTO. There is an enclosed tube that runs from front to back that houses some type of drive shaft the for Front PTO. Additionally, the rear PTO has a 1000/2000 RPM selection lever. And the lever is frozen stuck, as you can see from the rest of the tractor there is a lot of rust and corrosion to deal with.

#8 markdombroski OFFLINE  

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Posted August 20, 2012 - 11:12 AM

Here is a picture of the Fuel pump that wasn't working. Interesting that it was mounted to the side of the engine on the outside of the tin. I heard that some of the Onan engines had the fuel pump mounted on the carburetor? I am not sure if this is factory installed or an afterthought. It appears that the vacuum hose that attaches to the back was disconnected. Still trying to figure this out.

Here are some pictures of the crusty looking fuel pump. Time to bead blast and repaint.

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#9 daytime dave OFFLINE  

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Posted August 20, 2012 - 02:42 PM

I'm glad to see you making progress. It is just a neat tractor. Hope everything goes well as you proceed.
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#10 markdombroski OFFLINE  

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Posted August 20, 2012 - 05:09 PM

Bead Blasting done, painted and reassembled.

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Edited by markdombroski, August 20, 2012 - 05:09 PM.


#11 MH81 ONLINE  

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Posted August 20, 2012 - 05:45 PM

Be interesting to go back in time and see why the vac line got unplugged...

Great headway & good news that you found a gear + the engine is a runner. :thumbs:
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#12 markdombroski OFFLINE  

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Posted August 20, 2012 - 06:07 PM

Be interesting to go back in time and see why the vac line got unplugged...

Great headway & good news that you found a gear + the engine is a runner. :thumbs:


I assumed there was a vacuum line that attached to the back of the fuel pump. But the more I think about it, it may be that the pump is driven by the fluctuating pressure behind the main air housing tin. This would be an area near the main air inlet and would have quite a bit of turbulent pressure from the spinning fan. It appears that the fuel pump operates from fluctuating pressure. What I saw was the fuel pump was mounted to the side of the tin (See picture below) and the pressure input spigot was inserted into the main air housing shroud/tin.

Now, also noting that someone cut holes into the sides of the tin, I wonder if this would affect fuel pump performance? Still a bit of mystery to be solved.

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Edited by markdombroski, August 20, 2012 - 06:09 PM.

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#13 markdombroski OFFLINE  

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Posted August 20, 2012 - 07:51 PM

I'm glad to see you making progress. It is just a neat tractor. Hope everything goes well as you proceed.


Thank you Dave, I am really excited to get it running.

#14 markdombroski OFFLINE  

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Posted August 21, 2012 - 10:21 AM

I did some more looking and there is a tube that is supposed to connect to the back of the fuel pump. I will have to remove part of the side tin to reconnect and test the pump now that I have rebuilt it.

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Edited by markdombroski, August 21, 2012 - 10:24 AM.

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#15 markdombroski OFFLINE  

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Posted August 21, 2012 - 03:01 PM

Glad to hear you got her running , those side cover holes do seem strange , wouldn't that make the cooling worse because it would pull air in there instead of around the head or am I thinking wrong , which could be lol , Al


Thank you Al, I would like to do a full restoration and get this tractor back into shape. Probably will take some time and my first step is to work through some of the major mechanical issues first and then do the restore. Right now, I need to get the wiring and basic systems resolved, fix the steering, unfreeze some of the linkages and verify that I have a drivable tractor. Things are going better than expected right now.




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