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Posted by brian on May 5, 2007, 10:18 pm
>
> > I have a Craftsman DYT 4000 tractor with a 21 HP Briggs V-Twin. There
> > is some kind of a problem with the engine. When the engine is running
> > with blades off it sputters and backfires. When blades are on it runs
> > smooth. I have replaced air filter, fuel lines, fuel filter, plugs
> > and cleaned out the Carb. There is no sign of water in the fuel.
> > Also there are times it will bout die when coming off a hill, then
> > blow a puff of black smoke. Could it be the fuel pump is going bad?
> > Any help is sure welcome.
>
> > Thanks in Advance
>
> If it's really related to whether the PTO is engaged or not, I would
> suspect a problem with the safety switch on the PTO, although it seems
> to be acting backwards from what I would expect. When the PTO is not
> engaged, the switch is intermittently causing the ignition circuit to
> be interrupted; when you engage the PTO, the switch is not a problem.
> Normally the switch fails the other way. Assuming the safety is part
> of the PTO switch itself, this would be easy to check. Pull the wires
> off the PTO switch and see if anything changes. You don't say whether
> the behavior coming off a hill is with the PTO engaged or not.
I'll give that a try, i've also noticed that the AMP gauge has been
acting crazy. It usually stays right above 0 but lately jumps to bout
17 then down below 0. Don't know if that would have anything to do
with the PTO switch or not.
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