Proper Way to Engage PTO?

[RoyJackson]

I always engage/disengage at low throttle. But why is low throttle important to disengage?

It seems the implement has enough stored energy to provide a smooth disengage. I have done it on occasion and it is very smooth.

This is my opinion only...

When gears are meshing under a higher torque load (PTO turning an implement at higher RPM), there are stresses (not the best term, but I'm not a gear expert either) on the flanks of the gears as well as the shafts and associated hardware.
I just think shifting out of engagement while under that torque load could be more damaging to the driven components as well as those components that do the shifting (i.e. the PTO lever and linkage).

To me, reducing the RPM reduces that load and the potential for breakage during the disengagement (less torque on the components).

Again, I don't know enough about the stresses in a gear train to state the above with certainty. But I'll continue to reduce RPM before disengaging the PTO.

As an aside, reducing the RPM may reduce the wear on the PTO brake (if installed on your tractor).

Like I said, this is nothing more then my opinion...

 

[JC-jetro]

Roy,

Gears are in general designed in a manner to attract and mesh depending if they are rotating of one another, one being driving and the other driven. There is quite a bit of stress that the tip if they disengage abruptly. what's the hurry, one never has issue disengaging at low rpm. what I said is more prevalent in worm gears and such.

JC,

 

[ccsial]

Roy,

There is quite a bit of stress that the tip if they disengage abruptly. JC,

Interesing point JC. Sounds logical.

 

[radman1]

You should throttle down to disengage the pto. Most late model tractors have a pto brake for safety, even the CUTs. Disengaging at high rpm just wears the brake. If done a lot, the brake will burn out. The pto brake is a safety device to help stop the attachment in an emergency.

The only real stress in the system when stopping the pto is the brake. Older tractors like the Ford 8N could disengage what ever speed you want. The pto would coast to a stop.

 

[2LateIWon]

I have mine at idle and raised for my 5' brush hog. It's electronically engaged.

 

[Soundguy]

You should throttle down to disengage the pto. Most late model tractors have a pto brake for safety, even the CUTs. Disengaging at high rpm just wears the brake. If done a lot, the brake will burn out. The pto brake is a safety device to help stop the attachment in an emergency.

The only real stress in the system when stopping the pto is the brake. Older tractors like the Ford 8N could disengage what ever speed you want. The pto would coast to a stop.

EXACTLY.. on my tractors with a pto brake.. I dle down to save the brake.. or in a few cases.. I use an ORC so that the pto can stop and the implement can spin down. same ont he non live pto models.. the orc allows me to kill the pto and still shift with no backfeed.

soundguy

 

[JC-jetro]

The only real stress in the system when stopping the pto is the brake. Older tractors like the Ford 8N could disengage what ever speed you want. The pto would coast to a stop.

What you said does only apply to a hydraulically activated independent pto with a set of wet pto clutch disk. In a live or transmission driven pto a sliding gear will engage or disengage , it is teeth to teeth when they engage or disengage and there is no synchronizer there. There is ample opportunity to damage and break off the meshing teeth.

JC,

 

[Soundguy]

yep.. I would not want to disengage that sliding dog clutch under load. the shaft and coupler ends of the meshing gears will chew up a lil each time it is disengaged under load.

soundguy