Cub 1864 PTO not staying engaged

DY

Member
I just had someone replace the right side coil and plug wire. When I picked up the tractor I decided to engage the deck. It would pull in the electric clutch but it wouldn't stay engaged. The toggle wouldn't remain up. The mechanic said that he never messed with the switch so I brought it home and replaced the toggle switch myself. It cost me $42 to learn that the switch isn't the problem. The seat switch was bypassed years before I bought the tractor. The neutral switch had been moved out of the way so it was always happy. The engine starts and runs fine. The failure of the PTO switch is the only problem. This tractor was new in 1993. Any ideas? Thanks
 
DY:

Most likely, it is the Reverse Relay. although the Seat Switch and Reverse Switch feed this relay. You could check to see if wires connection(s) to these devices are good.

The relay is part no: [b:7cbaf43149]925-1375[/b:7cbaf43149]
 
Thanks for your advice. I have a few questions. Is there a way to test the reverse relay without replacing it first? What is the function of this relay. My reverse switch has been moved slightly so the hydro drive lever never touches it. Does it still have to function? Explain the theory of the safety switches. Are they wired in series like the old Christmas tree lights? When one is depressed does it cut off voltage to all the others. Do they all have to be "happy" to send 12V to the PTO switch? Someone enplane to me how the system is supposed to work. Thanks
 
DY:

Is there a way to test the reverse relay without replacing it first?
Yes. It is a simply relay with a 12V coil and a set of Normal Open [NO] contacts. Continuity is infinite at normal, and closed with the the coil energized.


What is the function of this relay.

The Reverse Relay is a Safety Device designed to dis-engage the PTO when the tractor Control Lever is put into the reverse position.

Does it still have to function?

Only if you want the PTO to dis-engage when the tractor is in reverse.

Here is a Enhanced Image of the 1864 PTO Circuit. In order for the PTO to stay engaged, one has to be sitting in the sit and engage the PTO Switch.

There can be only one of three possibilities:
(A) Bad Seat Switch
(B) Bad Reverse Relay
(C) Bad PTO Switch

mvphoto23766.jpg
 
Wow! Your reply really explained the system so I can understand it now. Thanks so much...............Dy
 
Like Paul Harvey would say," Here is the rest of the story." When the second mower repair guy couldn't figure out the problem I brought the tractor home. Then, using the wiring diagram, I located the reverse relay and started removing it. I discovered that one of the wires from the harness was broken inside the plastic multi plug. After I repaired that, the pto would stay engaged. Woo Hoo! Thanks so much for caring enough to reply to my questions. I hope that this will help someone else. DY
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top