Go BottomAnyone used a 3pt Log Splitter on a JD 770 or 790
 | DeereScott
Join Date: Jul 2003 Posts: 1 Howell, Michigan 
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2002-10-16 43892
Has anyone used a TSC 3 Point Log Splitter on a John Deere 770 or 790 ? If so, how did it work out for you? I have read most of the postings on the 3 Point Log Splitters, but most of them are using larger tractors. The JD sales brochures and specs states 5.6 gpm for the hydraulics system and 4.3 for power steering for a total flow of 9.9 gpm. My 770 does have power steering, MFWD and a front end loader. Any help would be appreciated. Thanks, Scott
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2002-10-17 43913
Also in the archives is a long discussion about JD hydraulic capacities that might make interesting reading.
I forget which JD model was discussed, but I'm assuming that it's the same design as a 770/90. The basic idea is that there are separate pumps for the power steering and hydraulic systems. The JD design combines the pump flows but only when the hydraulic system pressure is fairly high. The design improves the speed of hydraulic operations under high loads but the power steering stops working when the pumps are combined.
The usual concern in running splitters from tractor hydraulics is the speed of operation. Given the archive discussion, it's probably not fair to add the two pump capacities together to see if the tractor hydraulics meet recommended minimum gpm specs for the splitter. However, the performance probably would be better than the hydraulic system pump alone.
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| bluedog67
Join Date: Jul 2003 Posts: 2 pa
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2002-10-17 43920
My dealer said that the 5.6gpm is the max at the rear connection and the 4.3gpm steering requirment takes away from that from the 5.6gpm, is that correct? ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2002-10-18 43959
If the 770/90 has a separate PS pump, I can't see PS detracting from the hydraulic flow. From the earlier discussion I mentioned, the flows are added rather than subtracted under some conditions.
Something like the dealer says would be true for systems that don't have a separate PS pump. My Ford has such a system and the PS runs off a priority valve. It's called a priority valve because it guarantees flow to the PS at the expense of the hydraulic system. I believe that there is some flow through the PS system even when the steering isn't active and a typical amount may be around 20% of the pump's flow. That still would be a long way from subtracting 4.3 from 5.3 to get the flow to the hydraulics. Hard to say how much flow is demanded by the priority valve when the steering is active but I still wouldn't bet that 5.6 - 4.3 is a good answer.
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2002-10-18 43968
In real world experience, unless you're in the firewood business, the output from almost any modern compact made by the 'big three' will enable you to slpit more wood in one day than your back will appreciate for the next couple of days.
Firewood production is more function of efficiency than speed. Reduce the amount of bending, turning and handling to the absolute minimum and the speed of the splitter will have very little overall impact in your firewood pile.
I know this because we split a huge amount of wood every year. The guys built a bench which lines up with the height of the splitter, one person stacks wood onto the right side of the bench, the operator positions it in the splitter, and runs the splitter, the split wood is then pushed to the left where a third person piles it into pallet boxes. The splitter runs from the remote on a 40hp class L series Kubota. The tractor is only running at about 1500 rpm's. This is considerably BELOW the speed at which they RATE the pump output. It still can split about 4-5 dump trucks worth of wood in a day. A weeks splitting makes more firewood than the entire company (all employees get free wood) can burn all year, shop (3000 sq. ft.) heat and a fireplace in the office included.
Best of luck. ....
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| nighthawk
Join Date: Jul 2003 Posts: 9 Markdale, Ontario, Canada
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2003-01-21 47853
I use a home made 3PH mounted splitter on my 770. It works good without a lot of RPM, but I miss the fast retraction of a unit with a two stage pump. It is still acceptable, and I am quite a perfectionist. I guess if I was in the business or did an awfull lot of wood, it might not be fast enough. I use a bungie cord on the loader joystick and have to route the hoses to the front as I don't have a rear SCV.
Regards
Tom ....
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