Need for overruning clutch?
- Thread starter msjanket
- Start date
- Views: 4773
I don't see which tractor you've got, but if the tractor doesn't have an internal overrun clutch, then you'd be much better off getting one of the add on styles. It's more of a control safety than anything else, if you don't have the clutch, then just pushing the clutch in won't keep you from moving forward, the inertia of the bush hog will push the tractor for quite a while.
TripleR
Super Star Member
- Joined
- Mar 5, 2009
- Messages
- 18,538
- Location
- Missouri
- Tractor
- Kubota M8540HDC, L5740HSTC, BX2200, BX2660, John Deere 425&1025R, Case, Massey Ferguson, Ford
What Gunny said, most newer tractors have an internal overrunning clutch while some older won't. We have an old Ford NAA without an internal overrunning clutch and until we added an external one, the cutter would continue pushing the tractor forward while it spooled down, very scary.
k0ua
Epic Contributor
With most HST equipped tractors with Independent PTO, it does not matter at all as the PTO does not stop when you change directions or stop. If we knew what tractor you had, we could offer a lot more information.
Mace Canute
Elite Member
If you have a live or independent PTO you won't have any problem with the inertial of the bush hog pushing the tractor; it's only tractors with the PTO shaft directly connected to the tractor's transmission that can experience that problem.
Jerry/MT
Elite Member
- Joined
- Feb 2, 2008
- Messages
- 3,141
- Location
- North Idaho-The Palouse
- Tractor
- New Holland TD95D, Ford 4610 & Kubota M4500
I have a tractor with an independent pto and I use a ORC with our bush hog to keep from burning out the internal clutch when I throttle back. I don't have to worry about driving the rear wheels of the tractor with he rotational inertia of the mower because I have an independent PTO but I wan't to preserve the internal pto clutch.
LD1
Epic Contributor
Gotta know what kind of pto it has. Not familiar with holder.
Does it have a 2 stage clutch?
With tractor off and in gear with pto engaged, will it free spin one direction?
Does it have a 2 stage clutch?
With tractor off and in gear with pto engaged, will it free spin one direction?
Texasmark
Elite Member
- Joined
- Apr 24, 2012
- Messages
- 3,766
- Location
- N. Texas
- Tractor
- Ford: '88 3910 Series II, '80 3600, '65 3000; '07 6530C Branson with FEL, 2020 LS MT225S. Case-IH 395 and 895 with cab. All Diesels
That's called a transmission driven PTO. The PTO is directly coupled to the output shaft of the tranny vs a separate shaft and separate clutch for LIVE and an engagement mechanism (mechanical or electrically controlled) that is totally "independent" of the tranny for INDEPENDENT PTO.
The tranny driven PTO will lock up your drive train (pressure on gears keep them engaged and resist changing....like to N) as long as the blade is turning and you can't get your tranny out of gear. You can let off the gas in your tractor and push in on the clutch but the rear wheels are still driven until the kinetic energy stored in the spinning blade has dissipated.
The after market clutch just slides over your regular 1 ⅜ PTO shaft and adds roughly 4" to the length. They are another source of sloppy fit, even when new and another source of noise and vibration, especially in turns for a drag type mower. On a 3 PT it doesn't matter all that much. Course if you had a CV joint as the first joint in your mower, right at the coupling to the clutch, the vibration on a drag would be greatly reduced.
All spoken as a graduate of Hark Knocks University getting my degree the hard way.......through 35 years of trial and error at attempting to farm with worn out equipment, no money, and nobody around that cared enough to show me how it was done rather than make a laughing stock out of me. But that's all in the past now as are they!
geneP
Platinum Member
- Joined
- Jun 28, 2000
- Messages
- 845
- Location
- Central Mississippi, USA
- Tractor
- Case-International 385, Kubota L5450 w/LA1150A loader
Just for discussion, I stand to be corrected. If you have an independent PTO engaged, the PTO shaft is connected directly to engine rpm either by direct mechanical hookup or through a hydraulic clutch pack. When I bring my tractor RPMs down the cutter slows, too. I bring the engine to idle before disengaging the PTO to preserve the PTO brake. I don't think there is an over running clutch in this setup. There is a PTO brake that slows the implement when the PTO is disengaged.
Texasmark
Elite Member
- Joined
- Apr 24, 2012
- Messages
- 3,766
- Location
- N. Texas
- Tractor
- Ford: '88 3910 Series II, '80 3600, '65 3000; '07 6530C Branson with FEL, 2020 LS MT225S. Case-IH 395 and 895 with cab. All Diesels
My Branson is my only Independent PTO but it also can function as a Live in that you can push in the clutch and disengage it if that function is selected....feat accomplished by electrical sensors and controls. Not really Live but is tied to the clutch as is regular Live types with a double disc clutch (like my Ford 3000) for doing things like digging post holes. Engagement and disengagement of the PTO, regardless of mode selected, are accomplished by a set of clutch discs, 9 as I recall which distribute the shock as the associated tension moves from one disc to the next, obviously to eliminate shock loading. In addition, the discs are all wet which preserves their livelihood extending any possible maintenance action due to wear.
The other thing I have with this PTO is 3 rpm ratios selected with a switch: 540, 770, and 1000. Makes it nice on various tasks requiring different types of drives. Just another of the many reasons I passed over the popular colors when selecting my first new, first 4wd, and first cab tractor with my 3rd FEL. Haven't been sorry!
I too slow down my rpms before I do either of the above for the same reasons.
Am I pushing the Badge? Naw. Just staying up to speed with the Badge bashing this brand takes repeatedly!
Here are some similar links:
