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Ford Tractors Discussion Forum

641 Stalls under load uphill

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Don M

08-21-2003 05:43:05

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My 641 has developed a stalling problem when bush hogging going uphill. She runs OK on the level and going downhill. Gas tank is clean (no debris), sight glass on carb has no debris in it. My son has been mowing an overgrown field with lots of weeds that have gone to seed so radiator has required cleaning periodically to keep her running cool. Any ideas of things to look for are appreciated. Don

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09-05-2003 19:47:46

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 Re: 641 Stalls under load uphill in reply to Don M, 08-21-2003 05:43:05  
Check the large fuel adjustment screw on the carburetor. Back it off a quarter of a turn and try the heavy load/uphill mowing again. If it stalls again, back off another quarter turn. Your mixture ratio is fine for most mowing conditions, but too lean for a heavy load. Adjust it a while and see if it levels out. I fought this on mine for months before I checked this obvious setting. On the updraft carb, be sure to adjust the "large" adjusting screw. You will want to turn it counter clockwise to increase the fuel flow under high demand.

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08-22-2003 17:13:30

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 Re: 641 Stalls under load uphill in reply to Don M, 08-21-2003 05:43:05  

I've seen the little screen in the inlet fitting of the carburetor of some Fords get clogged.
Be sure to check the screen in the top of the sediment bowl assembly. Make sure the gas tank valve is all the way open and not clogged.

The hose between tank and sediment bowl could be kinked or deteriorated internally, blocking gas flow.

If good flow comes out the bottom of the carburetor with the plug out (outdoors, engine cold and not running, of course) you'll know it's not starving for fuel.

Wish you well

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08-21-2003 07:33:11

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 Re: 641 Stalls under load uphill in reply to Don M, 08-21-2003 05:43:05  
float level is set too low in the carb. float level set too high in the carb.. one will cause it to starve up hill the other will cause it to flood up hill.. and yes.. everything you said... with being low a gas another possibility when going up hills if the tank feed is foward on the tank..

your going the right direction.. keep digging..


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