TC40D PTO loss of power

[NesterBH]

I have a 2001 New Holland TC40D. It has around 1200 hrs on the clock. The PTO will spin up when engaged, but will slow down severely when a cutter is attached and driven into grass. The engine does not bog, and forward/reverse and loader operations function properly. I am looking for suggestions on where/how to start troubleshooting.

thanks,
NesterBH

 

[dave1949]

New Holland Parts Diagrams

The PTO clutch slipping is a possible cause.

At the above link, click on: (03) TRANSMISSION
then click on: 03.04.03 CLUTCH ASSEMBLY, PTO

Have you checked the slip clutch (if it has one) on the mower itself?

 

[NesterBH]

New Holland Parts Diagrams

The PTO clutch slipping is a possible cause.

At the above link, click on: (03) TRANSMISSION
then click on: 03.04.03 CLUTCH ASSEMBLY, PTO

Have you checked the slip clutch (if it has one) on the mower itself?

Thanks for the reply Dave. The PTO output shaft appears to be slipping. The cutter just has a shear pin.

I assume this clutch replacement requires a tractor split?

thanks,
Nester

 

[jinman]

Nester, the PTO clutch Dave means is the main PTO clutch that engages the PTO when you move the lever to ON. It is hydraulically actuated and is a clutch. That's worn on your tractor and is the source of your slipping when the PTO is loaded.

 

[NesterBH]

Nester, the PTO clutch Dave means is the main PTO clutch that engages the PTO when you move the lever to ON. It is hydraulically actuated and is a clutch. That's worn on your tractor and is the source of your slipping when the PTO is loaded.

Jim, thank you for your reply. Maybe my reply to him was a bit confusing. I understand that it has a clutch inside the tractor that he is suggesting is slipping. I was only mentioning the shear pin in response to his comment "Have you checked the slip clutch (if it has one) on the mower itself?".

So if the main PTO clutch is the culprit, does that require a tractor split to replace?

thanks,
Nester

 

[dave1949]

I am not sure what you have to do or what is involved.

Check this thread. I pasted in one of Jim's answers in from post# 8.

http://www.tractorbynet.com/forums/new-holland-owning-operating/244940-tc40d-rear-end-repair.html

It sounds like you are up to your armpits in this job. I hope you discover your click/tick source soon. Of course, the differential is in the center assy and requires some other disassy. to get at the differential. The Repair Manual says that the hydraulic PTO clutch and shafts must be removed. To do this, you must separate the differential housing from the transmission. I suppose you'll be able to look down inside the differential if you remove the hydraulic lift assy on top of it. So, if you haven't done it yet, you'll have to remove the fenders and the fuel tank to get the hydraulic lift assy off. I'm thinking you'll end up lifting the operator's platform too. There's just a ton of stuff to do that has nothing to do with your differential, but at least you'll be able to inspect those parts and the rest of the transmission.

Sometimes a gear tooth can be cracked and it will tick loudly. I've had them drive me nuts on a standard shift auto transmission. When I was a kid, I replaced both 1st gear and 2nd gear in a standard transmission before discovering a cracked cluster gear tooth. I hope yours is a lot simpler to find. I know this not much fun.

I'll also warn you that there are special tools for installing axle seals. I hope you get your manuals soon and can spend some quality time going over the job.

 

[jinman]

Dave, the symptoms Nester describes fit perfectly for a worn/slipping PTO clutch. He should check his lever for full actuation and maybe even pull the access plate on the platform below the operator's seat to look at the hydraulic valve that actuates the clutch. Partial engagement of that valve could also cause slippage.

I think the PTO clutch will have to be renewed. It requires a tractor split to R&R that clutch/brake assy. The problem is removing the shaft that goes through the clutch. It has to come out of the front of the transmission and can only be removed with the tractor split. Sorry for the bad news.

 

[dave1949]

Dave, the symptoms Nester describes fit perfectly for a worn/slipping PTO clutch. He should check his lever for full actuation and maybe even pull the access plate on the platform below the operator's seat to look at the hydraulic valve that actuates the clutch. Partial engagement of that valve could also cause slippage.

I think the PTO clutch will have to be renewed. It requires a tractor split to R&R that clutch/brake assy. The problem is removing the shaft that goes through the clutch. It has to come out of the front of the transmission and can only be removed with the tractor split. Sorry for the bad news.

Jim, I hope you didn't mind my passing along one of your great answers. I saw you were offline, and thought you might be for the evening.

My 6" chipper with its 200 lb flywheel is probably my implement with the most potential for pto clutch/brake wear. It takes a while for that to spin down, and no matter what I do, at idle it still has significant energy in the flywheel that the pto brake has to stop when disengaging the pto clutch.

 

[jinman]

Dave, I never mind being quoted. It saves me a lot of retyping. I agree with you that some implements still have a lot of inertia at engine idle speeds. All we can do is the best we can do. Idle speed is better than full speed, so that's really all we can do. My PTO still works perfectly with 2000 hours. . . knock on wood.