My Allis Chalmers 6080 PTO will not shut off with the lever. Even though I pull the lever to stop PTO, it stays engaged. Any answer to this issue?

https://www.amazon.com/AC-35-Allis-Chalmers-Service-Tractor-Manual/dp/B01M0WOYQS

https://www.youtube.com/watch?v=nKIJNiCH6p8

Above links are to a service manual and a YouTube video which may be of assistance.

"I have an Electric Clutch and my Blades will not engage when I operate the PTO switch."

• Turn the engine off and remove the key.
• Check for physical damage; anything look bent?
• Is the deck belt intact?
• Spin the pulley on the bottom of the clutch. Does it spin freely?
• There could be mud or grit stuck in the clutch.
• There is a drive key between the clutch and the shaft. Has this key been sheared?
• When you pull the PTO switch does the clutch make a "click"?

When you sit in the seat and turn the key, one click from off to run, you will hear a faint click. That faint click is the fuel shut off valve under the carburetor. It is turning on and off when you cycle the key from off to run. Do not confuse this click with the clutch click.

Leave the Key in the Run position, cycle your PTO Switch on and off. You will hear a click. This click will be twice as loud as the fuel switch click. This louder click is the Clutch engaging. If you do not hear this click, the PTO switch may be bad or the Clutch may be bad. This is assuming your battery is good and fully charged and that your Key Switch is functioning correctly.

PTO Clutch will Not engage or stay engaged.
There is a very fine discussion on evaluating electric clutches at this site:
http://www.messicks.com/Articles/FixingElectricClutch.aspx

My JD tech manual, which covers the entire LA 100 series, agrees with the electrical specifications. It states that the Electric PTO Clutch should show the following:

• Resistance 3.7 ohms
• Current Draw 3.25 amps.
• It does not give the air gap.

It does include a note to check the PTO Clutch Key for damage or if missing. So there is a drive key between the PTO Clutch and the shaft. Additionally, it recommends checking the tightness of the cap screw. That's the screw or bolt that holds the clutch on the shaft.

• Cap Screw torque 55 lb-ft (75 N.m).

Fixing Electric Clutches

Specs Link:
Allis Chalmers 410

Parts Link:
Simplicity Allis Chalmers Mower Parts

Had a friend who took off his Yamaha branding on a Motorcycle and replace with AC brands - AC rocks.

I would try checking the remote valves, maybe undo the line at each one and see where your pressure is stopped and maybe you can work down to where whitch with valve is not working..

Sounds more like a worn clutch plate.
https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1GGGE_enUS385US385&ion=1&espv=2&ie=UTF-8#q=allis%20chalmers%20180%20service%20manual

I have the exact problem, have to start with PTO engaged?

Sounds like you have a hydraulic flow valve problem. Check the lift arms when the pump is running to see if you have any hydraulic fluid leaking there.

try bleading the slave cylinder for the clutch

I had the same problem I replaced 2 switches, the first failed because of leaking, the second switch just stayed triggered, with a gauge installed I got 35psi @ 1500 rpm, I really think there is a problem with the new replacement switches, I ran the tractor for about 10 hrs with the gauge installed and it maintained 35-40 psi only dropping with the PTO ingauged or the P/S shifted.

Allis 7000.

540