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Case Tractors Discussion Forum
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Zenith Carb problems on VAC

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Eric Foster

05-21-2005 13:57:49




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All,

I bought the Zenith replacement for the TSX-114 on this site. The model I received was the Zenith 68. I think something is wrong. When I first installed it, it flooded as soon as I opened the valve on the sediment bowl. I assumed the float valve was stuck open from shipping. Knocking on the top of the throttle body above the valve didn't do any good. I opened the carb and found that the valve is somewhat looser in the guide/seat than the old TSX was (so much so that the float "jet" would get in a bind both opening and closing). I carefully put it back together, checked that I could hear the float operating and tried agan. Now it starts fine, but in the amount of time it would take for the bowl to empty, the tractor dies...hard.

Any ideas? I hate the idea of trying to adjust the float. I called Zenith and left a message, but I'd really like to get this thing running now. Any input would be greatly appreciated.

Thanks,
Eric

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Walt Davies

05-23-2005 08:32:21




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 Re: Zenith Carb problems on VAC in reply to Eric Foster, 05-21-2005 13:57:49  
I had an SI a few years back and spent most of my time working on the fuel system.
First i would take the whole system off from the tank to the carb and clean it thoughly, blow it out with a good air gun. Next check where the fuel bowl goes into the tank it could be plugged there (mine was more than once). Check the the float is in top condition no dents leaks or other problems and free in the carb bowl.
Check for water in the fuel tank even a very little bit will wind up in the carb and cause trouble. You can bleed it off from the plug in the carb bottom. Walt

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todd hamilton

05-22-2005 06:45:12




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 Re: Zenith Carb problems on VAC in reply to Eric Foster, 05-21-2005 13:57:49  
This will sound a bit glib, but to keep an old Case running you have to know how to tinker with a Zenith carb (I have a '44 SC). Float adjustment and operation is sensitive - be sure that the pin is centered and the float moves with no resistance at all. If the float is o.k. be sure that the main jet lean/rich mixture is set according to the directions in either the operator's or service manual. The starting point adjustment in the SC manual is two turns open (open is more rich). Adjust out for rich, adjust in for lean. It kinda sounds like you may have fixed the float but the mix is too lean and starving the engine for gas. Obstruction in the fuel line or sediment bowl will also cause the engine to run too lean. My old bowl leaked at the valve stem. After I replaced it, my tractor never ran better - it was also restricting my fuel flow. Hope this helps.

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Glen in TX

05-21-2005 21:13:39




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 Re: Zenith Carb problems on VAC in reply to Eric Foster, 05-21-2005 13:57:49  
Eric, I would try to resolve this with the folks here you bought the carb from. As for the factory its hard to get anything out of them as they will send you back to the distributor or dealer first usually.



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