Repairs, learning from mistakes

Posted by KEH on August 29, 2009 at 15:55:57 from (67.231.167.211):

Fuel issues on my 7711 Zetor. Hope this helps someone avoid similar mistakes.

Tractorwould be hard to start due to not getting enough fuel. Changed fuel filter which was not dirty. Dealer said to blow out banjo fitting at fuel pump, I did, but no trash there. tractor cut off while cutting hay a few miles from home, would pump priming pump which the book calls transfer pump to get tractor going. Got home, cleaned strainer and sediment bowl which had trash. I took fuel line loose and blew back into tank(with cap off). All clear. Some previous owner had forced on a 1/4 fuel line instead of 5/16 which the book calls for. I could barely get it back on but did get it enough to clamp it. Cranked tractor, started to cut hay at house, tractor died. Now the transfer pump on that tractor has a little plunger which you unscrew before pumping and it had started leaking fuel around plunger. I went to dealer 100 miles away and got a new transfer pump. Started pumping, hear air, found the sediment bowl was on crooked so with some effort, I straightened it and managed to get fuel pumpd in and tractor cranked. Was worried by the poorly fitting fuel line and decided to replace fuel line and return line. This involves draining the fuel tank and dropping it. The drained fuel had some trash in it so I removed the tank and fuel gauge and rinsed the tank out. No water was in the fuel. Turned the tank upside down and let it drain overnight. Tank looked ok inside. Put tank back on. Tank is on the side of the tractor under the cab, so it has to be lowered at least to get to fuel lines. Replaced lines with proper hose, but got the return line mashed between the tank and cab. Figured that out when I could not blow into the tank. Loosened bolts and dropped tank until return line blew clear. Fuel line was clear. Got tractor cranked, took it to shop, dropped tank, cleared hose, tightened tank back up. I think the previous owner had mashed the return line also which may have been the cause of my problems.

While the return line was closed, my pumping on the transfer pump appearantly got the return lines at the top of the injectors leaking, so i had to replace them. Unlike other tractors I've had, these line are rubber and wern't clamped too tight on the fittings.

Hope this helps someone avoid similar errors.

KEH

Replies:

• Re: Repairs, learning from mistakes Billy Shafer 17:30:00 08/29/09 (0)

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