I have a John Deere Z997R that the PTO kicks off randomly while mowing. It displays a DTC 003941.31 at times. Also get a 003941.14 at times. Both require the mower to be shut off and restarted to clear. Seems to start after mowing at least an hour. Any ideas?
John Deere Z997R PTO kicks off while mowing
rwd1831001
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I have a John Deere Z997R that the PTO kicks off randomly while mowing. It displays a DTC 003941.31 at times. Also get a 003941.14 at times. Both require the mower to be shut off and restarted to clear. Seems to start after mowing at least an hour. Any ideas?
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I got this from JD online manual:
3941.14 PTO On-Seat On. This is a Pop Up … not a REAL DTC.
3941.31 PTO On-Parking Brake On. Release parking brake if intent is to use machine to mow, etc.
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Already have that info...doesn't mean a thing to me or the dealer mechanic. Dealer has been trying to fix this for 3 months. Tried replacing the park brake switch. By-passed the seat switch. checked all the wiring and connectors multiple times. I'm leaning towards a computer problem after it gets hot.
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I'm pretty sure it's a heat related issue. It never does it until I run it for a good solid hour. Then it won't go 5 minutes without stopping. Not sure why it would drop out the PTO clutch. Does the computer just monitor engine coolant temp or have a temp sensor somewhere else? But I'm open to any ideas! I always blow it out after I'm finished mowing. I don't always open the hood and blow it out totally because it's such major pain to crawl on your knees to unlatch it. I will do a complete wash out of the radiator and hydraulic cooler before I mow with it next time.
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Did a very good job of blowing out the radiator and oil coolers before mowing last time. The problem is still there. Anybody have any other ideas???
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FIXED!! In case anyone is interested...loose connection of the heavy braided ground strap between the frame and the engine block. Saw it spark while I was testing things with the hood up and seat up. Tightened it up and have run it for several weeks now. Problem is gone!
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^^^^^ Sage advice.
Anytime you have suspected electrical/electronic issues, the FIRST thing to do is 'check the grounds'. And I don't mean just visually. Take them loose, clean them, make sure they are tight.
Intermittent or otherwise unexplained electrical issues almost always point to a grounding problem or a short.
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