Question about John Deere Garden
Tractor runs fine for a while while mowing grass. Then the pto disengages and will not come back on. The next thing that happens is the tractor shuts off because the battery has lost its charge
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Posted on Jan 02, 2017
its likely to be a switch playing you up try hard wireing the switch to see if it stops this cutting out first, do one switch at a time till you fine the one playing up
Posted on May 02, 2010
Depending on your engine.. Briggs and Stratton or Kohler there are 2 different seat switches that are used to power the PTO clutch. The seat switch can cause the PTO clutch to disengage anytime there is not at least 70 lbs in the seat.
The PTO drive wiring has a 30 amp fuse in it. If by chance a stick went through the belt and tore off the wires at the PTO clutch (Common failure) even after you repair the broken wire you still need to replace the fuse.
Check the PTO clearance gap. It should be 0.012 dis-engaged. Any other value and the clutch will not work correctly. Adjust the clutch if necessary.
There is a 2 pin Pigtail just off of the PTO Clutch that you need to check for voltage at the connector. Probe the back of the wires if you can and your looking for 12V DC under the following conditions.
BRAKE ON or tied down
SEAT (Briggs and Stratton engine only) Someone needs to be sitting on the seat.
Then Pull the PTO Switch out. You should hear the PTO Clutch CLICK. If you hear the click there is no need to check voltage. The PTO switch is a multi function switch and it is quite possible the PTO switch failed. I doubt that the PTO Clutch has failed as they normally give you some kind of noisy indication that they are failing and don't fail straight away.
So.. In short
Check PTO Switch (Red wires) to usually red or brown thru the switch
Check 30 amp fuse
Check PTO clutch wires near PTO clutch (They get torn from something traveling through the pulley)
Check PTO clutch clearance at 0.012
Check Brake switch for an audible click as you depress it some distance No click.. possible bad switch
Listen for Seat switch Click as you slowly add weight to the seat. No Click or any click and it can still be suspect due to the Briggs and Stratton installed engine ones have more than one function.. Ignition and PTO clutch power.
The actual wiring diagram is on page 35 of the owners manal that can be found here:
Lastly... check each of the mower deck blade bearings. A seized bearing can cause PTO problems.
Hopefully you have enough information to solve the mystery. If not just respond here and I will help you.
Thanks for choosing FixYa.
Posted on Oct 07, 2010
Testimonial: "Kelly - Your troubleshooting info helped me determine the PTO switch, mower belt and 30 Amp fuse were good. Solution: New battery fixed it. Thx! - Tom"
SOURCE: have a john deere sabre
Some mowers have a mowing reverse safety switch. That safety will kill the mower if you try to reverse with the deck engaged. Some mowers even have an override button that has to be held while backing up. As for the battery thing, no matter how much you charge a bad battery you will not get it to start a mower if it has a bad cell or two. I would use a multimeter to check battery voltage, but the end result would still be the same, replace the battery.
I hope this gets you going again.
Posted on Aug 07, 2011
First. My disclaimer. I do not have first hand experience with your model mower.
Well, it sounds like when you engage the PTO the power to the PTO shorts to ground causing a) your charge light to come on as the voltage drops substantially and b) your mower to stall as the minimum voltage of the ingnition system is reached (or some other effect is at work). The clutch is might be internally shorted, or you may have a frayed wire in the PTO circuit. You may or may not have a PTO relay. If you do, it is sure to burn up if you continue using your mower. If you do not have a relay, you will definitely burn out the PTO switch. It is odd you are not blowing an inline fuse if this is the correct answer. Check your PTO circuit with a continuity tester to tell you if there is a short (or measure resistance directly with a voltmeter on ohms).
Posted on Aug 09, 2011
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