John Deere F935 Manual
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Have an F935 that the PTO won't engage with the switch. The solenoid that retracts the PTO brake band and engages the shaft is free to move, has power going to it when switched, but doesn't engage. If you manually move the solenoid it will engage and keep the PTO running until you shut the switch off, then it disengages as it should, but won't re-engage unless you manually push the solenoid shaft again. It almost acts like one of the safety interlocks is preventing engagement, but power is getting to it, so that shouldn't be the issue. Maybe just a bad solenoid?
I'll pull the switch next and see if it's got an intermittent problem, but again, power seems to be getting through. I'm open to any suggestions.PatrickP.S. This year obviously has the PTO switch, not the manual lever/magnet combo on some F935s. Have an F935 that the PTO won't engage with the switch. The solenoid that retracts the PTO brake band and engages the shaft is free to move, has power going to it when switched, but doesn't engage.
If you manually move the solenoid it will engage and keep the PTO running until you shut the switch off, then it disengages as it should, but won't re-engage unless you manually push the solenoid shaft again. It almost acts like one of the safety interlocks is preventing engagement, but power is getting to it, so that shouldn't be the issue. Maybe just a bad solenoid?
I'll pull the switch next and see if it's got an intermittent problem, but again, power seems to be getting through. I'm open to any suggestions.PatrickP.S.
This year obviously has the PTO switch, not the manual lever/magnet combo on some F935s. I have a 2006 F911 (900+ hours) and just recently experienced a similar thing. The PTO switch will move the solenoid and 'open' the clutch brake, but the PTO shaft will not spin. I mowed for about 10-15 minutes and all of a sudden the PTO shaft stopped spinning even though the PTO was still 'engaged' and the clutch brake was 'open'. I can spin the PTO shaft with my hands while the clutch brake is open and closed.
Is that normal? I did just add some hydraulic fluid to the reservoir, but I wouldn't think that would have anything to do with it. The seat safety has been bypassed. Thought about the brake doing something funny, but that would disengage the PTO and 'close' the clutch brake, right? Does anyone have any thoughts on this? Thanks in advance. Thanks everyone for your responses.
I was able to 'fix' the problem late Friday night, just haven't been able to get back on here.Although the solenoid was extending fully (so I thought this wasn't the issue) I pushed on it by hand just to see what would happen. Wouldn't you know it, by moving it about 1/16' of an inch it engaged the PTO. Now, the solenoid didn't move any further, it was the bracket that holds that solenoid. I don't understand the circuit enough (or at all) to know why moving the solenoid bracket just a little bit allowed for voltage to get to the PTO clutch. So, I was going to remove the battery (one of the cables didn't want to come off) and adjust some of the bracket bolts, but instead I have a bungee cord pulling on the bracket. Mowed great on Saturday.
Just kicking myself for not trying the OP's solution even though I thought the solenoid was fully extended. Out $75 on a switch I don't need, but I'm cutting grass again. Hopefully this helps someone down the road.
Ok since this is reopened I have the answer for this. It is hard to explain but I will try. Starting at the PTO engagement switch next to the seat. Flip that switch and it turns on the solenoid under the seat that moves a lever that pushes a switch that sends power to the PTO. If the solenoid is moving and the PTO is not coming on then adjust the rod coming out of the solenoid to the lever till it makes full contact with the switch. This is the stupidist design I have ever seen. I personally removed the solenoid and wired in a new togel switch to the PTO wiring.
Very simple to do. The switch I used is a 6 wire switch wit an on-off-on.
John Deere F935 Oil Type
The wiring for the PTO is 4 wires and needs an normally open/ normally closed toggle switch. Ok since this is reopened I have the answer for this. It is hard to explain but I will try. Starting at the PTO engagement switch next to the seat. Flip that switch and it turns on the solenoid under the seat that moves a lever that pushes a switch that sends power to the PTO. If the solenoid is moving and the PTO is not coming on then adjust the rod coming out of the solenoid to the lever till it makes full contact with the switch. This is the stupidist design I have ever seen.
I personally removed the solenoid and wired in a new togel switch to the PTO wiring. Very simple to do. The switch I used is a 6 wire switch wit an on-off-on. The wiring for the PTO is 4 wires and needs an normally open/ normally closed toggle switch. Ok, this is just odd.After running fine for nearly 2 years using the bungee cord described earlier, my pto will not engage again as of 6/17/16. It was running fine for at least an hour and then I decided to stop and get a beer with about 30 mins. Got back on and the pto decided not to engage.
The solenoid moved but I guess it was back to not making full contact with the switch. I then pushed the solenoid a bit and it engaged for a little while and then went out on me. Now, no matter how much I push, the pto will not engage. And then you post this Saturday morning.
I guess I'll look at adjusting the solenoid rod. Any tips for doing that? Also, any more info on the switch you used to bypass the solenoid would be greatly appreciated.
Again, this is for a 1996 F911.Thanks!! First I said the wrong thing about the switch. It is an On/On switch. So it is basically 2 switches in one. I only use the 4 outer poles.
Normally open and normally closed. Flip the switch and it becomes normally closed and normally open.Her is the switch I al using.I can take a picture of the switch under the solenoid when I get home to so you its position. The switch is no longer there but I can mark it for you. You can also test the pto by manually pushing the button to see if pto comes on.WARNING WARNING WARNING.
THE MOWER DECK WILL TURN ON AND SPIN THE BLADES IF YOU PUSH THAT BUTTON WITH THE SEAT SWITCH DISCONNECTED OR BYPASSED. DO NOT DO IF YOU ARE NOT SMART ENOUGH TO STAY AWAY FROM YOUR MOWER DECK. WARNING WARNING WARNING. First I said the wrong thing about the switch. It is an On/On switch. So it is basically 2 switches in one. I only use the 4 outer poles.
Normally open and normally closed. Flip the switch and it becomes normally closed and normally open.Her is the switch I al using.I can take a picture of the switch under the solenoid when I get home to so you its position. The switch is no longer there but I can mark it for you. You can also test the pto by manually pushing the button to see if pto comes on.WARNING WARNING WARNING. THE MOWER DECK WILL TURN ON AND SPIN THE BLADES IF YOU PUSH THAT BUTTON WITH THE SEAT SWITCH DISCONNECTED OR BYPASSED.
DO NOT DO IF YOU ARE NOT SMART ENOUGH TO STAY AWAY FROM YOUR MOWER DECK. WARNING WARNING WARNING. So, I went home during lunch and tried to extend the solenoid. You can see on the picture (hopefully) how far the nut moved. Now that I'm looking at it, I think I actually shortened it. I also removed the plug with the 6 wires.
Should see it removed in the 2nd picture. When I did that, the mower will not turn over/start. I plugged it back in and it still won't turn over. So, I need to figure out what's going on with that too.I now understand what button you were referring to. It's underneath that switch I pulled out.Thanks for your help.