Kills engine when engaging blades... sometimes (XT1)
 

Cub Cadet XT1-LT 42 KH
Model Number: 13A0A9CS056

Trying to help my neighbor (who speaks very little english) with his lawn mower. He was cutting grass, stopped and got off to pick something up, got back on it and the deck would not engage. Sounds like one of the safety switches cutting the engine.

When you sit on the mower with it running and no brake/clutch and stand up it kills the engine. So, that seems to indicate the switch is working.

It doesn't seem to have PTO Clutch, the engage lever puts tension on the belt. The belt at tension is fine. Not too tight, just a little bit of give. Didn't see a safety switch on it.

Blades turn fine by hand, and all the pulleys seem to turn fine also. I can actually turn the belt a bit and see all the pulleys and blades turn.

Battery seems ok. I put my Noco charger on it and it was already at full and indicated no faults.

Tractor seems to run fine. Drives around. No stuttering or loss of power.

The next day he got on it again and the blades engaged fine. Then, same thing, he stopped at his shop to grab something, leaving it running, got back and tried to engage the blade and it tries to kill the engine like it would with a safety switch. Only thing, I'm sure that the day before it was killing the engine at the end of the lever throw to engage blades. Now, it is definitely trying to kill it at the top of the throw when you first start moving the engage lever. Weird. But I'm certain it was different the day before. And why did it start working again to stop?

Am I missing a safety switch somewhere or is something else going on? I can't figure it out.

Here is a link where you can find a wiring diagram.
https://pandpsmallengines.com/pages/...det-xt1-wiring

Looking at it you can see that the PTO switch has two contacts, one opens, the other closes when you operate the PTO lever.

The trouble is that either path from the contacts of the PTO switch pass through the seat safety switch and the brake switch, so a problem could exist almost anywhere.

The fact that the engine dies when it's supposed to only proves that some of the paths through all three switches are working, it doesn't prove every path.

Since your description indicates that it is intermittent I would assume that the switches themselves are good and concentrate on the connectors plugging onto the switches,
checking for tightness and corrosion.

Are these safety switches or harness the kind that have the tamper proof connectors that don't work if you unplug the switch from the harness? I didn't think about it until he left and I came in for the evening.

I checked all the switches and found one that was failing: the reverse switch which is just one n/o circuit and it is sticking: most times testing continuous in open position.

I removed it and and tried the tractor and it was doing exactly the same thing. So, I thought the problem was probably elsewhere. Left it off and continued testing other connections and switches. I think I tested everything but the ignition.

But just coming in it occurred to me that the switches could be the tamper proof variety that I'd run in to once before. Could that switch be the entire problem or is it just coincidentally failed?

The seat switch is tamper proof, meaning you cannot just unplug it to bypass it.
There are You Tube videos that show how to bypass it for testing.

The brake switch connectors must be plugged in for anything to work because there are multiple contacts in the switch. When the switch is operated some open while others close.