Wiring diagram and switch logic for LT2180

navyjoe · #1 03-22-2014, 11:27 PM

My LT2180 will not turn off the PTO clutch (stop the blades from turning) when I get off tractor. The seat switch is OK. It will almost not turn off when I turn off the switch either. It runs for about a minute then finally decides to stop. It is electrical problem so I could use a wiring diagram and the logic table for the PTO switch. Help appreciated. It kinda unsafe this way.

zippy1 · #2 03-23-2014, 12:30 AM

Sorry no help here, but someone will come along with help.
Hope you get it fixed

Only thing I can think of is a possible connection problem or switch, don't know

J-Mech · #3 03-23-2014, 01:32 AM

Quote:

Originally Posted by navyjoe

My LT2180 will not turn off the PTO clutch (stop the blades from turning) when I get off tractor. The seat switch is OK. It will almost not turn off when I turn off the switch either. It runs for about a minute then finally decides to stop. It is electrical problem so I could use a wiring diagram and the logic table for the PTO switch. Help appreciated. It kinda unsafe this way.

You sure it isn't a PTO bearing trying to seize?

If it has trouble stopping even with the switch, I'd lean more toward a bad bearing.

cubby102 · #4 03-23-2014, 01:53 AM

Just a thought could the pto need adjusting maybe? I dont know much about electric clutches but I know they can turn off when not adjusted didnt know if it could work the other way around

Sam Mac · #5 03-23-2014, 07:58 AM

Quote:

Originally Posted by J-Mech

You sure it isn't a PTO bearing trying to seize?

If it has trouble stopping even with the switch, I'd lean more toward a bad bearing.

Sounds like the bearing is on the way out to me also. I like the looks of this replacement for the 917-3446 PTO that you have, plus it's a lot less expensive.

http://www.ebay.com/itm/Cub-Cadet-PT...p2054897.l4276

navyjoe · #6 03-23-2014, 04:32 PM

Quote:

Originally Posted by J-Mech

You sure it isn't a PTO bearing trying to seize?

If it has trouble stopping even with the switch, I'd lean more toward a bad bearing.

Opps my bad, I did this too late last night and did not explain it well. I don't have trouble stopping the tractor. When I turn the key switch off the engine just keeps on running like nothing happened, then after a pause 5, 10, maybe 30 seconds it will go put-put-sputter then die. Yesterday while mowing I set the brake to get off the tractor (I didn't want the engine to stop). I forgot to disengage the PTO and after I got off I noticed the blades where still running. The engine should have stopped immediately as per safety interlock but it never did.

J-Mech · #7 03-23-2014, 04:38 PM

Quote:

Originally Posted by navyjoe

Opps my bad, I did this too late last night and did not explain it well. I don't have trouble stopping the tractor. When I turn the key switch off the engine just keeps on running like nothing happened, then after a pause 5, 10, maybe 30 seconds it will go put-put-sputter then die. Yesterday while mowing I set the brake to get off the tractor (I didn't want the engine to stop). I forgot to disengage the PTO and after I got off I noticed the blades where still running. The engine should have stopped immediately as per safety interlock but it never did.

Alright, then that sounds more like two problems.

The motor not dying with the key sounds like the mag isn't getting grounded. It is probably closing the fuel shut off solenoid and running the carb out of fuel. Check the ignition switch, and your grounds.

Second problem with the blades sounds like a seat safety switch. Probably suck in the "operator in seat" position.

navyjoe · #8 03-23-2014, 05:41 PM

Quote:

Originally Posted by J-Mech

Alright, then that sounds more like two problems.

The motor not dying with the key sounds like the mag isn't getting grounded. It is probably closing the fuel shut off solenoid and running the carb out of fuel. Check the ignition switch, and your grounds.

Second problem with the blades sounds like a seat safety switch. Probably suck in the "operator in seat" position.

Great idea!

I checked the seat switch last night. Its Ok. I have since found a wiring diagram but I don't know if it is correct or not. It shows a REV switch and relay which I don't have or if I do it has never worked. I routinely cut in reverse (why would they not want me to??). I see the ground circuit to the Mag and will see if I can trace it out.

Wish I had the connection legend for the PTO switch. It would make trouble shooting a lot easier. Also possibly the correct wiring diagram since the REV cutout makes me wonder.

navyjoe · #9 03-23-2014, 10:49 PM

Quote:

Originally Posted by navyjoe

Great idea!

I checked the seat switch last night. Its Ok. I have since found a wiring diagram but I don't know if it is correct or not. It shows a REV switch and relay which I don't have or if I do it has never worked. I routinely cut in reverse (why would they not want me to??). I see the ground circuit to the Mag and will see if I can trace it out.

Wish I had the connection legend for the PTO switch. It would make trouble shooting a lot easier. Also possibly the correct wiring diagram since the REV cutout makes me wonder.

Ok I've done more troubleshooting. First I've enclosed a picture of what I'm pretty sure is the shutdown terminal to the Mag (magneto) that is used to stop the engine. Let me know if I am incorrect.

To test it I jumped it to ground and I get the same result as with the safety interlocks and turning off the ignition. The engine hesitates, skips, but will not stop. So it appears something is wrong with the magneto wiring. Any input on this? The engine runs fine so it would appear that the magneto works. There is a lot of "take apart" to get to this mag so let me know if you have other ideas.

J-Mech · #10 03-24-2014, 02:02 AM

I'm not familiar enough with that tractor model to be able to tell from that close up pic whether your looking in the right spot or not. From here, that does not look like the right place for a Mag kill. It just looks like a ground point to me. I know a lot of the time people with this problem find that after removing the engine and taking off the tins around the flywheel, you find that the mag kill wire is broken or disconnected. Seen it a million times myself. R Bedell is the man with all the diagrams. He will probably be on here early morning and may have one for you. I am almost 100% sure, the problem is in the mag kill circuit. All the safety functions work on that circuit. IIRC, it is a blue wire on that machine, but I don't know for sure. If Roland doesn't answer in the morning, one of us will find you a "for sure" diagram.