Electric Pto engagement

[Clint199]

Hello, I have a JD 4500. It has an electric PTO engagement pull knob. Everything works correctly.
My question/concern is when I am using my bush hog type mower, when I engage the mower even at low rpm’s it is a violent slamming sound and seems that the dump of torque on the pto shaft might cause damage to the mower or to the gearbox of the tractor. Am I doing something wrong or is that the way an electric PTO works?

 

[ptsg]

It's just the way it works. The mower can take it. Keep engaging it at low engine RPM, it's about the only thing you can do to help it.

 

[Bearsixty7]

Try slowly rotating the PTO knob until it just starts to turn the pto/implement then release it a second then re-engage it, that's how I do mine. That way it gets the pto moving but doesn't apply full force/torque. I also only engage or dis-engage the pto at idle, making sure the engine and pto have slowed to minimum speed.

 

[Clint199]

Thanks—Rather ask than tear something up

 

[oldnslo]

There should be orifice in the PTO circuit to control how abruptly the PTO engages. This is kind of a balancing act on allowing the clutch to slip a little but not so much you burn the clutch plates.

 

[Bavarian]

The initial rumble when you turn on the Pto with a brush hog attached, are the knives. They are kind of "folded" in on the stump jumper and have to sort themselves through centrifugal forces.