1620 CC wiring schematic
 

Engine stars up and runs beautifully, but no PTO power to mower deck. I checked the wires to the electric pto but got no test light response when the switch turned on. Can i give direct power to the pto clutch to see if it ok? I took the switch off the dash but it has 5 tabs and I don't know how to test the switch itself. The tabs were very dirty and rusty, so maybe its is simply a bad circuit connection.

How does one connect to the tech library for a wiring schematic download?

ThANKS

YES

The Wiring Diagram has been sent to the E-mail address listed in your profile.

Mr. Bedell:
Thank you for the wiring diagram. Unfortunately the tabs on my tractor's pto switch do not match those of the provided diagram. I have removed the pto switch from the dash and cleaned all the tabs, which were very dirty and in some places rusted. I did a meticulous job of cleaning them and tried to clean up any ground connections. I re installed everything and tried to see if there was any signal (power) to the connectors to the pto clutch. I get no power to this point. The tractor will start and run but no power to the pto.

I must add that the pto clutch was retightened and immediately afterwards the pto would not activate. Having a spare pto clutch that I tested with direct power and found to click, I then connected it to the tractor connection but no response when the switch turned on. Question: Are there fuses that might have blown as a result of the clutch being set too tight when the switch activated? I did not discern any fuses on the wiring diagram you provided. Also, I note that none of the dash panel lights light up except the center and lowest which I believe states "full throttle not necessary..."

Any recommendations, suggestion are greatly appreciated..
boxccc

Having the PTO "brake" set too tight would not blow a fuse.
No fuse for the PTO on a 1641, only on the ignition.
If the tractor will start and run, and there is no power going to the PTO switch on any terminal, then you most likely have a bad wire somewhere. Take the diagram, follow it, and trace the wires starting from the battery and see where it loses power.

You answered your own question.

Are you using these requirements.....??

I have sent you an "enhanced wiring diagram" highlighting the PTO circuit. You may want to look at "grounding" also.

:Morning:
I do not no about the 1620, but I had the same problem on a 3000 series. The ignition switch had a separate ground where some how the ground wire had come off the the tab on the switch. Hooked the ground back up and the PTO worked fine. Not saying that is your problem, but might be worth looking into.
:American Flag 1:

Mr. Bedell/ J-Mech: Followed your recommendations and pretty much cleaned all contacts of dirt and corrosion as well as checked all grounds etc. I was able to test the PTO switch from another Cub which I knew worked. We were able to get the clutch to activate...however...now when the pto engages it stalls the engine even at full throttle. The individual who sold me the tractor mentioned that he though the clutch was too loose and he tightened it. Could this cause the engine to stall? I dont think it is the mower deck because I can move the pulley/belts/blades with little force...in other words I dont think the mower is bound up.

We (dear friend helping me) found that the PTO switch has three positions and not just an OFF On mode. Pushing the switch upwards activates the clutch to the engaged position the the handle moves to a hold position while mowing and does not turn off until the 3rd position of OFF is selected. We're not sure we were moving the switch correctly.

Is the clutch too tight (drive belt to mower) or what is causing the engine to stall when the pto is activated?

The PTO can overload the engine for a few reasons:

(A) There is a heavy mechanical load (bound up or too much to turn)
(B) There is a heavy electrical load (high amperage from a short)
(C) The tractor has a weak battery
(D) The tractor has a weak Charging System

OR, any combination of the above.

It is ALWAYS helpful to have the Owners Manual for your tractor.