John Deere 4100 will not turn over

[JD5210]

I do not own a 4100, but here is what your manual says to do tow it. I picked towing as I would have to think everything needs to be in neutral to tow. Hope this helps.

My take from reading the manual is you have PTO switch and a PTO control level?

1. Pull PTO control lever rearward to the disengaged/off position.

2. Disengage differential lock.

3. Unlock the park brake.

4. Gear Models: Place transmission in the neutral position.

5. Place the range shift lever in the N (neutral) position.

6. Disengage the MFWD.

Introduction

 

[Dutch445]

being a hydro you only have hi and low for "gears", with neutral between them.
you say you can move the lever, but would you say that it feels normal?
can you move between H-N-L with ease, and feel all the detents?
your may be stuck in a range, but it's odd that the tractor won't roll,
is there a chance the diff lock is locked down? have you tried rolling the tractor
both ways? for sure the brakes are released? (not that they have a safety switch)

 

[Dutch445]

here's a picture of the parts breakdown, it says number 20 is the neutral safety
switch on a hydro:

 

[diesel lover]

Ok got a little more tinkering done and here what I have come up with. I am still checking wires and electrical. I replaced the pto switch and still nothing.

Got to thinking. When I shut it down I was still rolling a little. (Man was that stupid....maybe). I tried to move the tractor with a winch and it would not move. The gear shift will move and it feels like it comes out of gear. Is it possible that it is stuck in gear and is there a way to manually move it to neutral?

Going to look into the manual right now.
Thanks
BL

so this is a gear shift trans and not a hydrostatic? Hydrostatic are not easy to tow with the engine off. There is sometimes a lever to move to the "tow" position for hydrostatic.

If its a power reverser like my friends 4510 was then you may need to switch it into both neutrals to tow it.

Again if it is a safety lock out you could start it with a remote start button from the tractor seat, bypassing the safeties and moving the tractor. Had to do it lots of times for different reasons.

 

[johns_dmax]

My JD5105 was doing this a few weeks ago. It turned out to be a bad ground connection at the frame. I had 12 volts at the battery and 12 volts at the starter when using the battery ground. When I used an alternator bolt for the ground the voltage dropped to zero when turning the key to the start position. I cleaned the frame surface and cable and it started right up. No problems since. Hope you get it running.

 

[Dutch445]

it's a 2 range hydrostatic transmission.
with the range selector in Neutral, the tractor truly is in Neutral and
will roll easily. there is no hydro disconnect per say, other than being in neutral.
if the tractor won't roll easily, then it could be in gear or the brakes are locked,
or the mfwd is bound (inside now, maybe was in 4wd and forgot).
that neutral safety switch should be easy to test.

 

[buddylee63]

Well hot dog!!!!!!! I just got it to turn over! The schematic really helped. The neutral safety switch had come unplugged. I plugged it back in and as soon as I got it all out back together, She fired right up. Huge Thanks for all who helped and posted. I learned a tremendous amount about my tractor. I just hope it will help somebody else too. Again thanks for the help