Go Bottom3PH ups and downs
 | Randy
Join Date: Feb 2002 Posts: 76 myLocation 
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2001-08-27 31328
I have a Kubota L3000 with about 10 hours on it. The other day while driving from one place to another the 3PH started going down and up all by it self. I have a Farmi winch on the back which weighs around 400 pounds. The hitch would all of a sudden drop about 4 inches and then come back the original height. It continued to do this about every 10 seconds or so until I stopped and dropped the winch to the ground and then lifted it back up again. After that it was okay. From the start the 3PH decent control knob under the seat was stuck in the open position. The dealer sent a serviceman out to take care of this. From the start I felt the 3PH operated quite jerky when I asked it to raise no matter how slow I moved the lift lever. Any thoughts ?
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-08-28 31348
A 3ph that cycles up and down while in neutral is usually faulty poppet or check valve seats or seals. The same could cause 'jerky' lifting. Such a condition might be 'self-correcting' on a new tractor--especially following the break-in hydraulic oil change. Poppet valve clearances are adjustable on many 3ph's, and an out of adjustment poppet valve also could cause the problem. The service tech probably checked the poppet valve clearance, but the clearance is easy enough to verify--probably takes a repair manual though. ....
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| Randy
Join Date: Feb 2002 Posts: 76 myLocation
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2001-08-28 31351
Thanks for the help. Do you think changing the oil before the 50 hour mark would be wise in this case. It seems like it could be several months before I reach that point. I am not doing any mowing with the tractor so the up's and down's aren't as dangerous.
Thanks,
Randy ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2001-08-29 31387
Does your tractor have draft control? Sure does sounds like one of the internal valves in the draft contol is self-cycling. If so, this is something that will reuire some disassembly and should be handled under warranty. ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2001-08-29 31388
Does your tractor have draft control? Sure does sounds like one of the internal valves in the draft contol is self-cycling. If so, this is something that will reuire some specialized work....often some disassembly.... and should be handled under warranty. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-08-29 31392
Since there's warranty coverage, it's sort of the dealers job to set it right and keep a satisfied customer. I'd work with the dealer and come up with a plan. The dealer may agree that an early oil change could help (maybe not), but an early change might affect later warranty coverage. The most important thing is not to compromise the warranty, which means following the dealer's recommendations as long as there is an OK working relationship. Just working the 3ph under considerable load also might help and wouldn’t affect the warranty. Yes, I keep forgetting about draft control, which is common on farm tractors and less so on compacts. ....
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| Randy
Join Date: Feb 2002 Posts: 76 myLocation
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2001-08-29 31402
I don't believe the Kubota has draft control as I understand draft control. My Ford 8N has a level located under the seat, in one position it allows the 3PH to float so if a plow hits a rock or hard spot it will ride up and over. The only 3PH controls I find on the Kubota are for rasing and lowering the 3PH, on the 8N I believe it is called the quadrant control lever. And, the 3PH drop control valve located under the seat.
One thing I did notice the first time I used my York rake on the Kubots was the rake seemed to ride up over the manure and hay mixture build up in the pasture where the horses were. The rake on the Ford appeared to stay down better and rather more material.
Thanks for the help. I am going to get the dealer to look at this, the only down side is the dealer will want to take the tractor for a while, hopefully it is something they can fix in a couple of days, not weeks.
Randy ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-08-30 31420
I didn't know 8N's had a hitch that would hold down--always learning something. As far as I know almost all newer 3ph's are not held down and always can float up over things. Draft control would work that way as well, except that the hitch would see a rock as a heavy draft and would give an assist to the upward float. My position control hitch also has only lift and flow-control adjustments. Some weight added to the top of the rake would help it go through stuff, at the risk of damaging the tines of course. Maybe somebody here would know how much weight (if any) could be added safely. The rake for the 8N was possibly heavier. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2001-09-11 31758
The hitch assembly for the 8N ford is a bit heavier than on the Kubota, neither hitch has down pressure. The weight of the hitch and the york rake or backblade is all you have to make the machines stay down. ....
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| Randy
Join Date: Feb 2002 Posts: 76 myLocation
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2001-09-11 31760
After using the rake on both tractors I have found that the top link position seems to make a difference. The length and angle of the top link changes the angle the tines attack the ground. One way the tines are angled to dig in a little the other way they kind of drag along the ground.
Raking speed seems to be a factor. The 8N does not go as slow as the Kubota, so it tends to plow through bumps and stuff more than the Kubota when I am going slower.
The 8N does seem to have a weighter hitch making it stay down better.
Thanks,
Randy ....
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