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post #1 of 19 Old 06-12-2019, 02:20 PM Thread Starter
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mower stalls after an hour

It will run for about an hour then stall, can a weak battery cause this? My battery has 12.73 volts after it dies. I have it on a trickle charger all the time or it won't start the next day. After it dies I turn the key nothing happens, I have to jump start it with my truck. I have had the battery tested in the mower running and out of the mower after it was charged at advance auto both tests says the battery is ok. I put the tester on the battery and the voltage goes is at 12.68 when the mower is running. Is battery dead, should I start with that?

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #2 of 19 Old 06-12-2019, 02:50 PM
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Re: mower stalls after an hour

I'm not sure the battery is the issue. Long as it spins the starter, over at a decent rate, the engine produces its own spark via magnetos.

#1: Be sure that all wire connections are clean and tight. Do this anyway just to eliminate it as a possible cause.

If the issue is the starter won't spin the engine, try swapping in a known good battery for a few test starts/runs. If it operates OK, then battery, or relay, or switch is the issue. I had a battery once that would short internally when load placed on it. Odd, but it acted similar. Voltage was OK, but loaded, wouldn't turn starter. If the same thing happens with a known good battery, then look to the starter, starter switch, or relay. Try to jump known good battery direct to starter. If that works OK, then likely its a switch or relay. If that doesn't work the starter has an issue.

Hope some of these ideas might be helpful.

EDIT: This applies only if your engine is run by magneto generated spark. You didn't mention what engine this was.

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Last edited by Alien5044; 06-12-2019 at 02:53 PM. Reason: Added thought
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post #3 of 19 Old 06-12-2019, 03:26 PM
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Re: mower stalls after an hour

If it has a fuel shut off solenoid in the carb,it might not open once the battery voltage gets too low and stall the engine..


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post #4 of 19 Old 06-12-2019, 03:26 PM
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Re: mower stalls after an hour

Sorry, but IMHO, 12.6V at the battery with the engine running (presumably right after starting the engine, which is right after charging the battery with a battery charger) means that there is a problem with the charging circuit on the mower. It should be at 13.5-14V or so. And mowing for an hour after fully charging the battery, then it dies and nothing works until you charge the battery again follows along with this. Once the battery is charged, it sounds like it's working fine, in that it starts the mower, and runs the PTO for that hour until the battery is discharged.

I would suggest looking at the charging circuit, there could be a loose or disconnected wire,corroded connection or a problem with the regulator or physical components on the engine (for example, some engines, the magnets for the charging circuit can fall off the flywheel).

First check the wiring, because it's easy and doesn't require much disassembly, then look at videos on testing the charging circuits on small engines to see how to test/fix them.
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post #5 of 19 Old 06-12-2019, 06:02 PM
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Re: mower stalls after an hour

Always stuns me when people ask questions about engines but don't tell WHAT engine, make, model number.

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post #6 of 19 Old 06-19-2019, 12:26 PM Thread Starter
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Re: mower stalls after an hour

Quote:
Originally Posted by Walt 2002 View Post
Always stuns me when people ask questions about engines but don't tell WHAT engine, make, model number.

Walt Conner
It's posted under the question. That way I don't have to post it each time.
1979 314 Engine K321AQS

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck

Last edited by mlizotte; 06-19-2019 at 01:34 PM.
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post #7 of 19 Old 06-19-2019, 12:38 PM Thread Starter
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Re: mower stalls after an hour

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Originally Posted by dave_r View Post
Sorry, but IMHO, 12.6V at the battery with the engine running (presumably right after starting the engine, which is right after charging the battery with a battery charger) means that there is a problem with the charging circuit on the mower. It should be at 13.5-14V or so. And mowing for an hour after fully charging the battery, then it dies and nothing works until you charge the battery again follows along with this. Once the battery is charged, it sounds like it's working fine, in that it starts the mower, and runs the PTO for that hour until the battery is discharged.

I would suggest looking at the charging circuit, there could be a loose or disconnected wire, corroded connection or a problem with the regulator or physical components on the engine (for example, some engines, the magnets for the charging circuit can fall off the flywheel).

First check the wiring, because it's easy and doesn't require much disassembly, then look at videos on testing the charging circuits on small engines to see how to test/fix them.
Thanks for the info.! I found the rod on top of my carb. had fallen off, I need a new c clip. I think that made it stall, my mower idles a little rough to begin with. I found the back of the key switch lugs really rusted. Would a John Deere brand last any longer than an Advance Auto or Lowes one? I did add dielectric grease but the lugs still rusted.

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #8 of 19 Old 06-19-2019, 01:00 PM
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Re: mower stalls after an hour

Quote:
Originally Posted by mlizotte View Post
It's posted under the question. That way I don't have to post it each time.
Respectfully, just saying something like "It's the tractor & engine in my signature" would make that much more clear. Otherwise people have to assume what machine you're talking about (you might have several, signature may not be up to date, etc). And if someone is on a mobile device, using Tapatalk, they may not see your signature at all.

Tractor-Holic, the carb solenoid closing as the battery voltage falls too-far was my thought as well, if it has one of those solenoids. The battery shouldn't be discharging while mowing, so something is going on with your charging circuit, which may be eventually causing other problems as the voltage falls.
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post #9 of 19 Old 06-19-2019, 01:50 PM
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Re: mower stalls after an hour

My guess is that it's your voltage regulator. Shopping online, you'll find they don't break the bank. I just bought one for $22.

In the past:
Craftsman, MTD, Snapper, 1961 Ford 801 Powermaster, 1992 LB 4.5HP 580546, 2003 LB 10552 6.5HP Duraforce, IH Cub Cadet 105, 2001 Cub Cadet 2146 14HP Linamar 38" deck, love of my life (Sold 10 Dec 2011), 2007 Cub Cadet 2550 22HP Kohler Vtwin 50"deck (Sold 22 Aug 2018)
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1994 JD LX178 sweet little mower, only 15HP, twin cyl, 38" deck, liquid cooled!
1998 JD 445 22HP Shaft driven wheels, shaft driven 60" deck, diff-lock, hydraulic lift, power steering, fuel & temp gauges, fuel injected, and liquid cooled! This machine has it all!
2005 Nortrak NT 254 25HP Diesel 5' FEL, here's a case of cost-cutting, I only need a tractor 3 or 4 times a year

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post #10 of 19 Old 06-19-2019, 04:08 PM Thread Starter
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Re: mower stalls after an hour

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Originally Posted by mowergene View Post
My guess is that it's your voltage regulator. Shopping online, you'll find they don't break the bank. I just bought one for $22.
https://forums.yesterdaystractors.co...c.php?p=624889 Thanks, here's a pic. of the wiring system. I read 90% of the time it's that. I just switched to a good battery. 12.83 volts key off and 12.78 volts running. Can you test the reg. off the mower?

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #11 of 19 Old 06-19-2019, 04:30 PM Thread Starter
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Re: mower stalls after an hour

from the web link "You can test the connection with a continuity test. Must have 12.5 or so to reg. to make the system work." I get 0.90 ohms at the lugs at the reg. does that mean it's bad?

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #12 of 19 Old 06-19-2019, 05:01 PM
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Re: mower stalls after an hour

If your "idiot light" for the battery wasn't coming on before, hook up the new regulator and give it a shot. When you turn the key to ON the light should come on. Once it starts, the light should go off. If it does, you'll know it's charging.

In the past:
Craftsman, MTD, Snapper, 1961 Ford 801 Powermaster, 1992 LB 4.5HP 580546, 2003 LB 10552 6.5HP Duraforce, IH Cub Cadet 105, 2001 Cub Cadet 2146 14HP Linamar 38" deck, love of my life (Sold 10 Dec 2011), 2007 Cub Cadet 2550 22HP Kohler Vtwin 50"deck (Sold 22 Aug 2018)
In use:
1994 JD LX178 sweet little mower, only 15HP, twin cyl, 38" deck, liquid cooled!
1998 JD 445 22HP Shaft driven wheels, shaft driven 60" deck, diff-lock, hydraulic lift, power steering, fuel & temp gauges, fuel injected, and liquid cooled! This machine has it all!
2005 Nortrak NT 254 25HP Diesel 5' FEL, here's a case of cost-cutting, I only need a tractor 3 or 4 times a year

Going to try to stay Liquid Cooled the rest of my life! Hey, it gets HOT here!
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post #13 of 19 Old 06-19-2019, 06:27 PM Thread Starter
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Re: mower stalls after an hour

Quote:
Originally Posted by mowergene View Post
If your "idiot light" for the battery wasn't coming on before, hook up the new regulator and give it a shot. When you turn the key to ON the light should come on. Once it starts, the light should go off. If it does, you'll know it's charging.
There's no light or no amp meter. It's like driving an older vw bug. lol

1979 314 Engine K321AQS
1981 49" snow blower
48" mower deck
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post #14 of 19 Old 06-19-2019, 09:13 PM
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Re: mower stalls after an hour

If the battery is putting out less voltage running, it looks like either your stator isn't working or the VR. The regulator is the more suspect of the two. That's really all I know to tell you. I'd buy the regulator unless you're flat broke. They're an electronic device and don't like all the heat off the engine!

In the past:
Craftsman, MTD, Snapper, 1961 Ford 801 Powermaster, 1992 LB 4.5HP 580546, 2003 LB 10552 6.5HP Duraforce, IH Cub Cadet 105, 2001 Cub Cadet 2146 14HP Linamar 38" deck, love of my life (Sold 10 Dec 2011), 2007 Cub Cadet 2550 22HP Kohler Vtwin 50"deck (Sold 22 Aug 2018)
In use:
1994 JD LX178 sweet little mower, only 15HP, twin cyl, 38" deck, liquid cooled!
1998 JD 445 22HP Shaft driven wheels, shaft driven 60" deck, diff-lock, hydraulic lift, power steering, fuel & temp gauges, fuel injected, and liquid cooled! This machine has it all!
2005 Nortrak NT 254 25HP Diesel 5' FEL, here's a case of cost-cutting, I only need a tractor 3 or 4 times a year

Going to try to stay Liquid Cooled the rest of my life! Hey, it gets HOT here!
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post #15 of 19 Old 06-21-2019, 10:44 AM
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Re: mower stalls after an hour

I wouldn't buy anything but the geezus clip for the carb linkage . Fix that and see what happens before spending money. 12.6 Volts is a good battery . Good luck, please report progress.
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