Valtra PTO slow down

[robert t]

This problem has just started. I have had the tractor for nearly 2 years and it has been fine until now.

When I now try to run a chipper or anything els off the PTO it slows the PTO down which slows the chipper so it stalls or slows the pump on the timber crane so it want work, It doesn't seem to affect the tractors engine revs though.

Dont know to much about tractors but I am guessing that there could be some sort of clutch on the PTO that could have worn, or may be some kind of pump thingy to engage the PTO.

 

Your thoughts or advice would be appreciated.

 

Cheers,

 

Robert.

[b101uk]

It could well be the clutch pack which also acts as a “soft start” or it could even just be an electric fault if its started/stopped by a rocker switch

 

Have you tried the other pto speed or if it has a removable rear PTO stub have you removed the circlip and pulled the stub out to see if the splines have stripped on it.

 

If it looks like it’s the clutch and it’s a wet PTO clutch I would stop using it as all the debris from it slipping end up in the gearbox/trans axel oil which is also used for the hydraulics!

[robert t]

It could well be the clutch pack which also acts as a “soft start” or it could even just be an electric fault if its started/stopped by a rocker switch

 

Have you tried the other pto speed or if it has a removable rear PTO stub have you removed the circlip and pulled the stub out to see if the splines have stripped on it.

 

If it looks like it’s the clutch and it’s a wet PTO clutch I would stop using it as all the debris from it slipping end up in the gearbox/trans axel oil which is also used for the hydraulics!

 

It dose work with an electric rocker switch, but the shaft engages and turns ok, but as soon as labour goes onto it, it slows down. Have tried different implements at different speeds and still getting the same prob. Cant see any thing obvious that allows shaft to come out so cant check the splines for ware.

Stopped using the PTO for now. Will get tractor engineer to look at it, Thought I would run it past on here to see if it might be common prob.

 

Cheers,

 

robert.

[arbwork]

What model is it? We had a problem with one of ours some time ago the dealer changed the clutch pack and found out later that it was the wire to the sensor at the output shaft, if same on yours it is covered by an angled piece of metal just to the right of the shaft , a rather vulnerable place for our work, I believe this senses the speed of the shaft and compares it with the input side and if there is a % of difference it disconnects the drive , it feels exactly the same as a badly slipping clutch, worth a try . if you need more info call, cheers J

[robert t]

What model is it? We had a problem with one of ours some time ago the dealer changed the clutch pack and found out later that it was the wire to the sensor at the output shaft, if same on yours it is covered by an angled piece of metal just to the right of the shaft , a rather vulnerable place for our work, I believe this senses the speed of the shaft and compares it with the input side and if there is a % of difference it disconnects the drive , it feels exactly the same as a badly slipping clutch, worth a try . if you need more info call, cheers J

 

Its a 6400 year 2000. I noticed the wire to the electrical sensor next to the shaft and your right it is protected with angled piece of metal. It dosnt seem to be broken or damaged so I didnt touch it. Will disconnect it and clean it and look at it a bit further.

 

cheers

 

robert

[Brushcutter]

Don't know much about the 6400 series. Our A95 had a very similar problem to yours. It turned out to be the pto clutch wasn't properly adjusted and it had worn away. Needed a new one i don't think it was a wet clutch though or the damage could have been much worse.

[robert t]

Don't know much about the 6400 series. Our A95 had a very similar problem to yours. It turned out to be the pto clutch wasn't properly adjusted and it had worn away. Needed a new one i don't think it was a wet clutch though or the damage could have been much worse.

 

Is there any easy way to tell if the clutch is a wet one or a dry one?

A least then i would know if it is going to be bad or really bad:confused1:

[Brushcutter]

I'd ask one of the guys at Jas P Wilsons. They deal in a lot of Valmets Valtra/Valmet and Valtra (all incarnations of the same thing) tractors.

[twmarriott]

sounds to me like the pto clutch is slipping.

[Breezeblock]

if there is pressure tappings on the pto you can borrow a set of gauges from me i am just down the road in denny