L4400 PTO clutch brake

[kgroesch]

I just got my 3 month old Kubota L4400 tractor back from the shop. They had to rebuild the pto as a tube had broken inside and was causing the PTO clutch to slip. The PTO clutch doesn't slip anymore , but I think I have a new issue .

When I disengage the PTO, the PTO shaft attached to my 6FT bush hog does not come to a complete stop. The PTO shaft is probably turning about 30-60 RPM. If I drop the mower down in grass, it will come to a stop. Lift it back up and it will very slowly come back up to the 30-60 RPM. This is with the engine at idle. At 2000 RPM engine speed, it is probably turning about 90 RPM. Sounds like the PTO brake isn't engaging.

Before the repair it used to always come to a complete stop but then again, the PTO was never fully engaging. I called the dealer and he said to let it have some run time and it may correct it self thinking is was due to the new parts in the transmission. Anyone have any such experiences?

 

[art]

It should come to a complete stop! This is a safety issue and I'm quite sure the dealer would want to straighten it out.

 

[Gamer1524]

I just got my 3 month old Kubota L4400 tractor back from the shop. They had to rebuild the pto as a tube had broken inside and was causing the PTO clutch to slip. The PTO clutch doesn't slip anymore , but I think I have a new issue .

When I disengage the PTO, the PTO shaft attached to my 6FT bush hog does not come to a complete stop. The PTO shaft is probably turning about 30-60 RPM. If I drop the mower down in grass, it will come to a stop. Lift it back up and it will very slowly come back up to the 30-60 RPM. This is with the engine at idle. At 2000 RPM engine speed, it is probably turning about 90 RPM. Sounds like the PTO brake isn't engaging.

Before the repair it used to always come to a complete stop but then again, the PTO was never fully engaging. I called the dealer and he said to let it have some run time and it may correct it self thinking is was due to the new parts in the transmission. Anyone have any such experiences?

Did they ever fix this for you

 

[kgroesch]

The dealer just called yesterday and said it was fixed. They said the clutch brake was defective. I guess it possibly was that way from the factory but the original problem with the clutch slipping may have been enough power loss to allow the PTO shaft to stop rotating without the brake working properly. Makes me wonder if Kubota made a change in their L4400 transmission that is causing these quality issues. I never dreamed I would have this much trouble with a brand new Kubota tractor.

Dealer didn't charge me for pickup/delivery or for uninstalling/installing the FEL or rotary cutter this time around. I will just be glad to get it back fully functional and enjoy a little more seat time.

 

[krackerjack9]

Hmmm I have a L4400 DT and when I disengage the PTO it does continue to spin but its more of flywheel effect from the mower. But it dose eventually stop spinning. I didnt think there were be a brake clutch on a PTO?? I was under the assumption it was hydralic for power. I could be wrong.

 

[kgroesch]

Here is an article on the web I found that describes various PTO drives including the style on the L4400. This is not to say it describes exactly how the L4400 works but it seems very close.

http://www.tractorsmart.com/main/Tractor%20Power%20Take%20Off%20Types.htm

The L4400 service manual does talk about a brake on the PTO. I don't think it is a very powerful brake, just enough to overcome any force applied by the hydralic fluid between the disks. It will probably take some time for a large rotary cutter to come to a stop. The problem with mine is that it would never come to a stop. I just had to push on the protective sleeve over the drive shaft and could bring the PTO to a stop with my rotary cutter attached. But when I released the pressure on the sleeve, it would very slowly start to spin back up to about 30 RPM. So a very weak brake would be sufficient to keep the PTO from turning when disenagaged.