Go BottomKubota L2350 hydro lift problem
 | JLWallace
Join Date: Posts: 1 
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2002-08-17 41342
The lift will not raise implement. At maximum lift the implement will barely raise off the ground. Any suggestions?
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2002-08-18 41358
I'm assuming that the 3ph was working and then stopped, and that no work on the hydraulics has been done recently. First thing to figure is whether the pump, the system pressure relief valve or the 3ph has a problem (all three could have a problem but that's pretty unlikely).
If the tractor has auxiliary hydraulics such as a loader then the problem is pretty easy. If the loader works and the pressure relief valve opens when the loader is 'cycled,' then the pump and relief valve are OK. If the loader doesn't work the pump or relief valve probably is the problem, but a pressure test would sort it out. Pressure tests are best if the tractor has no auxiliary hydraulics. On some tractors if nothing is connected to auxiliary system ports, a diverter valve can be moved to auxiliary to see if the pump will open the pressure relief valve.
Most 3ph problems require tear down and the work shouldn't be attempted without a repair manual. If it's a position control hitch, a stuck unload valve is the most likely candidate, followed by a faulty poppet valve and a broken safety pressure relief valve. However, many 3ph linkages are adjustable and can be repaired without tear down--a repair manual would give the procedures. Often it's possible to see if the quadrant lever actually moves the control valve arm. On some 3ph's you also can see the lift valve spool depressed in lift mode and the poppet valve depressed in lower mode. An adjustment sets the gaps for these two valves.
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