Tractor with two wet clutches PTO and transmission.

   / Tractor with two wet clutches PTO and transmission. #11  
As far as I can tell from the lousy illustrations in the service manual, my JD 4400 has a wet multi-disc clutch. Still need to split it to change it though. It's a job that I should do, as the clutch does slip, badly at times, but one I'm not at all looking forward to. :(
 
   / Tractor with two wet clutches PTO and transmission. #12  
JC:

Those wet clutches in tractors (and in motorcycles) are amazingly
robust and long-lasting. Electrically-actuated (not hydraulically-
actuated) wet clutches have been around a while (e.g. the Kubota
GST), but they usually include a dry clutch, too. My JDs had no
clutch at all for the main drive train and electrically-actuated
clutch for the PTO. Eliminating the foot clutch entirely has some
real advantages, but I think that your main point is easier clutch
replacement. Dry clutches are still seen as wear items that need
periodic replacement. This is despite the fact that the super-low
gearing of a tractor should require very little clutch slipping to get
the machine going. Many dry clutches last for decades and 1000s
of hours on tractors, properly used. That said, I think that any sort
of wet clutch (foot-operated or electrically-operated) should very
likely relegate the tractor's clutch to a very rarely replaced item.
Tractor splitting should become extremely rare. I wonder why we
don't see more foot-operated wet clutches on CUTs.

BTW, my recently sold M/C had over 50,000 miles on it over the 27
years since I bought it new, and the clutch never exhibited any signs
of needing replacement. Driven mostly in town, slipping the clutch
to get started was ususally how it was used.
 
   / Tractor with two wet clutches PTO and transmission.
  • Thread Starter
#13  
CumminsLuke said:
I am not 100% sure, but I think my Kubota M7040 has a wet main and wet pto clutch?


Yes, you're right. They advertise them as having multi disk wet clutches for both PTO and Transmission. Only if they designed a 30 hp class, beefy little tractor with the dual wet clutches would be great, something like L3400 with simple electronics without any bells and whistles. That's what I want.:D

JC,
 

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   / Tractor with two wet clutches PTO and transmission. #14  
Personally, I prefer the hydraulic pto's I've used on larger equipment, including AG tractors. Completely independent and no clutch to worry about at all. I've never looked into it, but would be suprised if the CUTs with hydro trans don't use them.
 
   / Tractor with two wet clutches PTO and transmission.
  • Thread Starter
#16  
CumminsLuke said:
Even hydraulic pto's so far as I know have a clutch mechanism.


That's exactly right. I wondered what Villengineer referring to is a set up like a transmission diver PTO, basically one shaft to run both transmission and PTO. The final PTO shaft and intermediate PTO shaft have to be coupled by means a sliding gear, one way cam/clutch (same as Kubota). The coupling and uncoupling to pto drive can be done by a hand lever or hydraulically hence thinking no clutch involvement at all.

JC,
 
   / Tractor with two wet clutches PTO and transmission. #17  
Villengineer said:
Personally, I prefer the hydraulic pto's I've used on larger equipment, including AG tractors. Completely independent and no clutch to worry about at all. I've never looked into it, but would be suprised if the CUTs with hydro trans don't use them.

My 2 current HST CUTs have separate dry foot-operated clutches to
operate the PTO and provide start interlock safety. My JD955HST had
no foot clutch at all and electric solenoid-operated PTO wet clutch.

When one says "hydraulic", that could mean just any wet clutch or it could
mean that hydraulic master and slave cylinders are used to operate a
dry or wet clutch.
 
   / Tractor with two wet clutches PTO and transmission.
  • Thread Starter
#18  
dfkrug said:
My 2 current HST CUTs have separate dry foot-operated clutches to
operate the PTO and provide start interlock safety. My JD955HST had
no foot clutch at all and electric solenoid-operated PTO wet clutch.

When one says "hydraulic", that could mean just any wet clutch or it could
mean that hydraulic master and slave cylinders are used to operate a
dry or wet clutch.


Bingo. Right on the money. I had the same understanding.

JC:)
 
   / Tractor with two wet clutches PTO and transmission. #19  
Like I said, I've never looked into it on the current CUTs. But I know that some other equipment I've worked with/on have true hydraulic pto's. Essentially you hook your implement to a hydraulic motor. The clutching, etc.. is all done in the valving. Another example you've probably seen is the simple versions used on skidsteers to operate pto driven equipment using the aux hyd supply.
 
   / Tractor with two wet clutches PTO and transmission.
  • Thread Starter
#20  
Villengineer said:
Like I said, I've never looked into it on the current CUTs. But I know that some other equipment I've worked with/on have true hydraulic pto's. Essentially you hook your implement to a hydraulic motor. The clutching, etc.. is all done in the valving. Another example you've probably seen is the simple versions used on skidsteers to operate pto driven equipment using the aux hyd supply.

Got it, so some hydraulic pump driven by engine serving both HST and a dedicated PTO hydraulic motor. My idea from the beginning was to make a very simple design, No HST (hyd pump or motor), power directly coupled to transmission or pto thru two wet multi disk clutches.

JC,
 

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