Gravely 812 Dies with PTO Engaged or Any Load - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
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post #1 of 5 Old 05-12-2019, 04:52 PM Thread Starter
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Unhappy Gravely 812 Dies with PTO Engaged or Any Load

Hi All,
I have been having an issue recently where after receiving my 812 back from the repair shop, (deck fell off belly), any time there is load put on the engine it stalls and dies. I have now replaced: the head gasket (cylinder in good condition), fuel filter, carburetor (adjusted it), fuel pump, points, and coil. Not sure what the next steps are at this point. I used to be able to mow three foot tall brush climbing a 15 degree incline, but now I cannot even climb a slight incline or mow anything.
Any helps appreciated,
Ted
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post #2 of 5 Old 05-19-2019, 09:16 AM
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Re: Gravely 812 Dies with PTO Engaged or Any Load

My first guess would be that the engine is not getting enough fuel under load. You might want to try readjusting the "high" needle outward (richer) a quarter turn, or so for starters. You might also want to double check the points to be sure that they are gapped at 0.20 in. Over the years, I have noticed that they tend to close slightly when tightened, and have had to readjust them.

Also, if you haven't already done it, you may want to take your carb. apart and clean it, including spraying all of the passages with carb cleaner using the straw. There are also tiny holes, barely visible, in the long needle that clog up. Try alternately spraying into them with the carb cleaner straw pushed against each of them. You should see carb cleaner spraying out of the others.

Finally, is it possible that the shop adjusted the governor? If so, it may have been done incorrectly, and may need to be readjusted.


Dave
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post #3 of 5 Old 05-19-2019, 01:32 PM
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Re: Gravely 812 Dies with PTO Engaged or Any Load

If it's running too lean you can do a quick test by pulling on the choke a little bit. If it runs better you know you need to be richer. It may help a little too when you try to put a load on it, but probably not much. There is no substitute for fuel, but choking the air off can be a troubleshooting tool.
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post #4 of 5 Old 05-19-2019, 01:56 PM
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Re: Gravely 812 Dies with PTO Engaged or Any Load

If it doesn't respond to a little choke as suggested,it might be the spark is weak--failing condensor if it has points,weak coil output,or corroded points can cause it to die under a load..

I have had some engines that would die under the slightest load,but run perfect sitting there with no load,and it turned out to be the fuel tank had a hose fitting with a fine mesh screen made into it,that was clogged and I had to tear it off and use a drill bit by hand to ream all the red silty rust out of the fitting,it was nearly completely blocked up..after that the engines ran great with much more power..
I've had old rubber fuel lines get mushy inside and form a clot too,ethanol does that to old hoses not rated for alcohol fuels..


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post #5 of 5 Old 05-20-2019, 11:41 AM
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Re: Gravely 812 Dies with PTO Engaged or Any Load

What do you mean by, "deck fell off belly?" I haven't seen where you've tried running the tractor without the deck installed, have you? Have you verified that nothing is bound, stuck, or stiff in the deck?

Rick

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