1772 PTO clutch not staying engaged
 

Read a lot but have not found anything that points to my issue here. And with the snow we now have it needs addressed. I have a 1772, the clutch engagement for the snow blower, mower deck ect only stays engaged in the start position, not in the run. I had to clear the driveway with the switch pressed in the start position and the extra draw killed the battery even though it was running. I have replaced the switch and the relay with no change. The seat switch has been disengaged for 5 years so I do not think that's the issue. This summer this happened sporadically but now its all the time. Im running out of ideas. Any help guys?

All the start position does is bypass the seat and reverse switches and when released there is a holding circuit that keeps it in until the seat, reverse or switch is turned off. There should not be any extra current that way. Diesels have a small charging system to start with and if the tractor charges at full throttle and discharges when the pto is engaged then I'm thinking your pto is causing the extra current draw and probably starting to fail. If you can, use an ohn meter and check the resistence of the pto and lets us know what it is. Welcome to OCC and congrats on one of the most sought after Cub Cadets.

The PTO does NOT draw any more amperage in the Start position as it does in the Run position. A couple of things I see.

(A) There is a Charging System issue.
(B) There is a weak (or bad) battery
(C) There is some sort of electrical short in the PTO circuit
(D) There is an issue with the PTO itself.

As far as the PTO not staying engaged, in addition to the previous suggestions, the "Reverse Relay" could also be suspect.

Thanks for the quick response. I do love this tractor. Iv owned it for 8 years now. I had one of those Home depot 27hp cubs for a week when I found this 1772 for sale up the road at a Kubota Dealer. needless to say I put the home depot one for sale in the front yard that day. Its got the 60" deck, 45" blower and the power angle plow. Plus the snow cab.

Anyway I believe the clutch tested 2.7 ohms does that sound right? I can shoot a video if that helps at all. Its got a new battery and regulator in the last couple months as well. The safety shut offs are wired to the #5 prong in the relay on the left side below the battery. Would not unplugging that eliminate all safety functions? I thought I read somewhere the seat sensor is a normal closed switch, so unplugging that #5 plug on the relay would leave that loop open correct? Wiring is not my forte, cant you tell? I'll change motors and rebuild trannies all day, but wiring just don't sink in this head lol

Where is the reverse relay located? btw

Andy, once the relay is engaged by pushing the switch up to the start position the only thing that will open the relay (and shut the pto off) is the normallyt closed reverse switch (opens when shifter is moved to reverse by the little micro switch you can see in the shifter slot) or the seat switch that is closed when you are sitting in the seat. I just checked the pto on my 1772 and it looks like it is around 4 ohms. I'm thinking your pto is starting to fail. If you have a good meter you can see how many amps it is pulling.

YUP....right in the ball park.

In order for the Reverse Relay to stay energized (for PTO operation) the hydro lever has to be in neutral or forward positions AND someone has to be sitting in the seat.

Okay, I just tested mine and it pulls 4.35 amps.

If that all checks out I wonder if the ignition switch could be the problem because it powers the switch and relay. I would unplug the pto and power it up with a jumper with no attachments hooked up. If that all works it may be time to call Kubota for a new ignition switch.

I have a NOS coil somewhere. I will try and find it and see what a new one reads (ohms). Worse case you get a motor shop to rewind the coil.

My reverse switch has never worked since owning this tractor so I would imagine it is disabled as well. But I will check the micro switch in the dash to be safe. One thing I found strange in just tinkering this afternoon is this acted the same with the relay on the left side below the battery not even plugged in. So what's de that tell you?

You guys are a plethora of information, I really do appreciate it.