HST Question : New Holland Tractor Review  -- New Holland Tractors Discussion Forum and Review HST Question : New Holland Tractor Review -- New Holland Tractors Discussion Forum

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 06-25-2004, 09:31 Post: 89330
5picker



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 HST Question

Been reading the HST clutch or no clutch thread with interest and since there wasn't a definitive answer on clutch pedal operation for the transmission, I thought I'd start another thread but on a related subject.
Question is...I too have a TC33D HST, are there any clutches/clutch packs used inside the HST operation of the trany or is it 100 percent fluid coupled? I question this to determine if I am doing any harm to anything when I bore into a dirt pile or bog down with a heavy load in soft/muddy soil. I know you should find a range beforehand that allows maximum torque to the drivetrain but there are times when you can find yourself in a situation where you are in the wrong range and the machine simply won't pull or push. It's during those brief moments before you stop and re-range that I am wondering if I am hurting anything?

I guess all the years of seeing burned up clutch packs in an automotive type trany has me wondering???






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 06-25-2004, 10:15 Post: 89336
DRankin



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To the best of my knowledge, the power transmitted to your drive wheels is 100 percent fluid coupling.

There will however, be some sort of clutch to regulate your PTO output.






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 06-25-2004, 10:28 Post: 89338
beagle

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Don't know exactly about the TC33, but usually the hydro trans. is direct drive to the gear box. There is no need for a clutch between the transmission and the gear box since the drive comes from fluid power. The transmission is a variable displacement pump and a hydraulic motor in a closed loop circuit. The pressure relief in the loop is intended to protect the trans. from over torque. The is a charge pump on the system, but it is only there to make for the hydraulic losses in the closed loop.

There is a clutch between the engine and the transmission. It would be possible to over work this clutch by heavy loading, but I don't think I've heard of that happenning very often. The worst thing that usually happens from lugging a hydro is overheating the transmission. That should be avoided.






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 06-25-2004, 10:47 Post: 89340
DRankin



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 HST Question

Beagle: Maybe the NH's are different? I thought the swash plate inside the HST functioned in place of a clutch.

I have had three HST's now and on two of them, the only clutch I am aware of is to stop and start the PTO shafts.

On my RTV there is no clutch of any sort, just a brake, a gear shift lever and a "go" pedal.






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 06-25-2004, 11:01 Post: 89341
beagle

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Yep, could be. There are several types and variations on the Hydro. The basic principles are all the same, but everyone has to have their own way of applying them. Keeps life interesting. My memery ain't what it used to be, but I think the Kubotas are direct link. Not sure about the Blue ones.






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 06-25-2004, 11:11 Post: 89343
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 HST Question

I've never really thought about but I know if I step on the clutch in my 'Bota L4310HSTC the PTO and the forward motion stop.

Best of luck.






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 06-25-2004, 15:07 Post: 89350
corvettetim



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 HST Question

The clutch on my DX33 works as if you were to put a clutch in front of an automatic tranny. Push in the clutch and you stop moving






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 06-26-2004, 04:03 Post: 89367
hardwood

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 HST Question

I really don't know much about brands other than Deere or the older International Harvester hydro units, but I really doubt that there are any clutch packs or dry plate clutches involved. The older IHC combines had a clutch pedal on the hydro drive I think more as a panic pedal for people that had allways driven gear drive machines. The clutch on them was a valve that broke the fluid circit between the hydro pump and the hydro motor. Long as you have to have the hydro unit in neutral to shift between ranges than I'd say there is no clutch pack involved. Frank.






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 06-28-2004, 08:47 Post: 89494
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 HST Question

Frank, I agre with your comments, but, the info. I have says my PTO is all gear driven.

If so there must be a clutch somewhere in there.

Best of luck.






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 06-28-2004, 21:13 Post: 89571
beagle

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 HST Question

The clutch is in front of propeller shaft and the pto shaft. When the clutch is not engaged, both shafts are isolated from the flywheel, so there is no power to either the hydro or the pto. Since there are two front shafts off the clutch, the pto is independent of the propeller shaft, and live off the clutch shaft.






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