Go BottomB2710 3-pt lift stuck in raised position
 | R Martelli
Join Date: Posts: 1 
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2001-08-25 31282
After 2 hrs brush hogging with a 1999 B2710 (140hrs), the 3-pt lift (with brush hog attached) is stuck in the raised position. There is no response regardless of lift lever position. The front loader still operates in all positions, and there is no problem with the steering or hydro trans.Any ideas would be appreciated. I'm borrowing the tractor from a good friend who is out of town, and the dealer just closed for the rest of the weekend. Thanks!
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| kay
Join Date: Posts: 1
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2001-08-25 31285
Check for a valve that adjusts the speed that the 3pt arms drop. If somehow this valve (located around the seat but not that familiar with your tractor) was closed, then your problem would result. Be careful finding it, so you do not open it with someone or something under the mower,- in case this is your problem, but it sounds like it. ....
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| R Martelli
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2001-08-25 31296
Thanks Kay, you're right on with your advice ! There is a knob in front of the seat that is labeled "open - close". Thanks for the tip ! ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-08-26 31299
Good it's straightened out. You may have been feeling that you broke your friend's new tractor as well--probably not too comforting a thought. Adjustment of the flow control valve may be more important for mowing than for brush cutting. In general, you want the valve slow enough so the implement doesn't crash down when it's lowering. However, you want it fast enough so the implement follows the ground contour at the speed traveled. The 3ph lifts when the cutter goes over a bump. If the valve is set too slow it doesn't lower fast enough on the backside of the hill and leaves longer grass or brush. ....
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| kay
Join Date: Posts: 1
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2001-08-26 31304
Tom. Your comment about the "3pt lifting when going over a bump" only happens if one moves the 3pt hand control to lift it and then lower it again. You imply that there is something "automatic" and the 3pt lifts on its own. Let me know if I missed something here? The implement follows the ground contour by leaving the top arm loose enough to let the rear height of the deck be controlled by the rear wheel(s), and the front height of the deck be controlled by the set position of the 3pt arms. If there is a bump, stump, or rock that you want to avoid (go over), then raising the 3pt arms is necessary. The rear of the deck will not raise until lift arms go high enough to take the slack out of the loose top arm. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-08-27 31313
Kay: My thinking here is that a 3ph always can float up. Position control only sets how far down the hitch goes. When a tractor starts up a hill, the hitch floats up until the implement is on the same slope. The hitch also floats up when a fixed top-link cutter or 4-wheeled mower cutter goes over a bump. You’re undoubtedly right about how a cutter with a flex top-link and a tail wheel works. I really don't have the geometry in mind. Anyway, no automatic lifting was implied. My thinking about oil heating is that I believe when a 3ph floats up, oil is drawn into the cylinder through the unload valve. The hitch is then in lower mode and the poppet valve is open. The hitch is free to return to return to its position set level. On lowering, oil flows out of the cylinder through the flow control valve in route to the poppet valve and back to the sump. A tightly set flow control valve would force oil through a small opening (like a pressure relief valve). The oil might heat up if the cutter was heavy and there were many hills and bumps. If the flow-control valve was completely closed, then the cutter may float up and never return to it’s position level. It wouldn’t follow the ground in that case. Anyway, if I didn't get this completely right, I'm always open to learning something. ....
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