John Deere D140 with 22 hp v-twin briggs

[geno368]

I have replaced all the deck belts and pulleys and sharpened the blades. Motor runs great and has good compression. I have checked push rods and they are fine. I have replaced carb and battery as well as all filters.
The problem is that when I pull up on the mower switch it starts turning the blades and then shuts off the motor. I can try the switch for a few seconds and when I turn it off the motor picks back up if I don't let it die.
Need help figuring how to turn on this 48" deck....Thank you

 

[ILENGINE]

Lets start with disconnecting the deck belt from the electric pto clutch and then start the mower and engage the pto switch and see if it stays running or still tries to die. This will determine if the problem is with the mower deck or possibly a safety switch shutting the engine down

 

[2muchgrass2mow]

My money's on the bad safety switch. If that proves to be the problem, don't just unhook it and start mowing without it. Very dangerous for a number of reasons . . .

 

[geno368]

Which safety switch are you referring to? RIO?

 

[Grasswhore]

Which safety switch are you referring to? RIO?

My money's on the bad safety switch. If that proves to be the problem, don't just unhook it and start mowing without it. Very dangerous for a number of reasons . . .

I'm betting on one coil not working.

 

[grumpyunk]

As suggested, you may be running on one cylinder. If both are functional, holding a hand NEAR the exhaust and comparing one exhaust to the other may indicate readily that one is colder than the other. They both should start to heat up within seconds. That would indicate either a coil/magneto problem or a spark plug problem.
If that is not the case. then checking that the governor works, and the linkage can be moved freely without binding would insure it is not stalling due to not being able to open the throttle in response to the increased load. The governor holds the rpms in control, and if they start to drop due to having to start spinning the blades, it opens the throttle to compensate. If the linkage is gummy, bent, warped, or jammed in any way, it can't open the throttle, and stalling may occur.
tom

 

[geno368]

Thanks for all the replies...I found the culprit.....a bad seat safety switch....actually it was not plugged in all the way......I am not the original owner, so, maybe someone was trying to diable it?????

 

[Grasswhore]

Thanks for all the replies...I found the culprit.....a bad seat safety switch....actually it was not plugged in all the way......I am not the original owner, so, maybe someone was trying to diable it?????

Thanks for the follow up, soooo many people on groups and forums neglect to reveal the solution or outcome of their issue!

 

[kjonxx]

Thanks for all the replies...I found the culprit.....a bad seat safety switch....actually it was not plugged in all the way......I am not the original owner, so, maybe someone was trying to diable it?????

That was my first thought, bad seat switch.