PTO Switch
 

I have a 1988 Cub Cadet Tractor model 2072.

The toggle switch for the PTO only engages when I attach a rubber band to it to hold it up and on.

I have replaced the switch and the relay. It still does the same.

Any suggestions?

My guess is that one of the other safety switches has a problem. the 2072 is a CCC/MTD machine so I moved your post. :beerchug:

I'm sure the electrical master AKA Roland will be along with a wiring diagram and suggestions on what to look for.

As Sam has indicated, it is another device. Check these two items. (A) The reverse switch. It is located under the dash. It is a micro switch that is dis-engages (Opens the circuit) when the Hydro Motion Lever is pulled into reverse. AND....(B) The Seat Switch, obviously located under the seat. It is a push button switch that is normally open. You have to set in the seat to make the circuit.

NOW.....this is under the assumption, that (A) the wiring harness is intact and in good condition, and (B) the tractor is wired correctly.

Let us know what you find.

Thanks but more!
 

First of all, thank you for your response. I apologize it has taken so long to look at this but I live in Minnesota and recently retired and have been in no need to mow, so consequently did not get around to working on this.

I found the micro switch but do not see how it is affected by the PTO toggle nor the Hydro shift/lever. The micro button does not appear to even be close to the shift, so it doesn't have an impact.

At any rate, I did check this all out and it still does not work with the toggle unless it is held up.

It all worked fine when I moved it to Minnesota from NY. My father bought it just before he died, 26 years ago, and though I had work done on it, it was the transmission (another future question) and the engine.

Any other suggestions or resources??

Many thanks!!

Replace 925-3066 Reverse Switch.

I would think the pto needs to be adjusted ,check the air gap on it and adjust accordingly per the manual, see it that helps.

Part
 

I ordered it yesterday

:IH Trusted Hand:

Not the solution
 

OK, I got the switch and finally just got it in (was out of town hunting turkey)

That did not solve the problem.

Next try? Seat switch is fine, as the tractor starts when the button is pushed down.

AS A TEST...........

Take a long jumper wire and connect one end to the positive (+) Battery Terminal. With the other end of this wire, "Touch" the Brown Wire connector at the Bosch Type Holding Relay and see if the PTO engages and stays engaged,

Report back.

I am having the same issue with my '93 1864. I have 12+ volts to the clutch when the PTO switch is in the start position but when in the on position I have 0.00 volts. Is this the same issue you have. I too have replaced the PTO switch and reverse relay 725-1375.

Seat switch isn't used during starting.....


You both need to check the seat, and reverse switches.

So where do you have 12 volts when the switch is on? Going into the seat switch? Going into the reverse switch? Dangling on a broken wire under the tunnel cover?

Bill

I had this exact same problem on my 1641 when I got it because the seat switch was disconnected. I connected it and it worked.

It was a broken wire in the reverse switch plug, put a new female end on the wire and I'm back out a mowing again!!!

Attaboy! :beerchug:

Did not do anything
 

Thanks again for your patience. Yesterday, I was finally able to do as you suggested (another long story) and nothing happened at all. I continue to use a rubber band to keep the switch on. I can't find any breaks/cuts in the wiring.

Replace the Holding Relay.

The relay is new

If you ran the long jumper wire to the Brown Wire terminal directly from the Battery, then one of three conditions exist.

(A) The relay is not properly grounded
(B) The relay is not properly wired
(C) The relay has an open coil (bad).

Time to re-examine the wiring diagram and with the DVM do some more testing & checking.

BTW: can you snap a picture of the relay and post it.

Photo of relay
 

attached is the photo of the relay

The previous information would have worked. It was a SPDT Relay while the one on the 2072 is a SPST Relay (No normally closed contacts)

The 2072 uses a 725-0894-----> 925-0894 Relay.

Here is a Diagram of how this should be wired.

Green wire is Ground
Brown wire to Control Circuit
Brown & Green is the Relay Coil

White wire is Power Source (12VDC+)
Black wire to Elec PTO
White to Black is the Magnetic Switch contacts

When asked to run a jumper wire from the Battery (+) terminal to the Brown Wire, if all was good, that relay should have energized.

The White Wire has 12VDC+ as long as the Ignition Switch is in the "Run Position".

Since the White Wire has 12VDC+, and the Relay is energized, then the PTO will engage.

Fixed!
 

I should have paid more attention to your directions.
Indeed, one of the brown wires on the seat switch was disconnected.
It works fine now.
Thanks for your help!

Been tracing down wiring circuits since 1975 and I usually get things figured out. :biggrin2:

Still trouble
 

Hello Roland,

After having thought that things were fine when I reconnected the brown wire to the seat switch, when I put it in reverse during the first mow, it quit working and I had to use the rubber band again.

So, I bought a new seat switch and boot and installed that and cleaned the wires and used the electric lube and still a no go!

What can I try now?

Mark

Well, since it has been a couple of months now, I'll have to go back and re-read the posts to refresh my memory.

Is my understanding correct, that you have purchased and installed the following new Cub Cadet Parts:
* PTO Switch
* Holding Relay
* Reverse Switch
* Seat Switch

In addition, that the 2072 tractor is wired per the factory wiring diagram...???


:bigthink:

Yes, all have been replaced. Remember, it ran fine for about a year after I moved it to Minnesota. When the toggle stopped working, I replaced that. Then the relay. Then the reverse switch. Now the seat.

AGAIN....did you run the Jumper Wire Test, from the Battery (+) post to the Brown Wire on the Holding Relay..???

:bigthink:

When I touch the relay terminal that the brown wire would be connected to, the relay opens/shuts.
When I touch the brown wire (not connected to the relay) nothing happens.

Then there is some sort of issue with the circuit (Brown Wire) from the PTO Switch to the Holding Relay. You have:
(A) A bad safety device
(B) Bad wire connector
(C) Bad (open) wire.

The voltage from from PTO Switch Terminal "A" is not making it to the Relay.

You said that when you put it in reverse, the pto quit. Your new reverse switch is working. That's what the reverse switch does, it kills the pto. That is exactly why most reverse micro switches have the metal finger bent completely out of the way like yours was... Did you try just "engaging the pto" while not in reverse?

I found the issue: The lower connector on the toggle switch has/had a bad brass fitting for the brown wire. I was able to bend it to make it work. But, I would like to replace that connector. Any suggestions? Can I just get the connector and not the entire harness?

Where......???? :Huh:


As far as the Terminal End, go to any Auto Parts or Hardware, and buy a Female Disconnect (Blue). Cut off the old end, bare the wire, install new disconnect, and crimp.