In a perfect world, yes, it should work at low speed, but be slow.
What's happening is there is fluid loss somewhere. It can be a worn pump, a leaking bypass valve, a cylinder leaking internally, or a directional valve not centering. Some have a valve that directs hydraulic power to the 3 point, the back hoe, or the loader. If it is not in position or leaking internally it could loose pressure.
It can be a challenge to locate the pro blem, and hydraulics are too expensive to throw parts at.
If you raise the loader, and let go of the valve, will it stay up? If yes, the cylinder seals and directional valve are good.
When the bearing were replaced in the pump, was the housing bore to gear clearance, and the gear end clearance checked? If the bearings failed, the gears could have damaged the housing. That may be a good place to look first.
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Today's Featured Article - Women and Tractors, A Woman's Touch - by Teri Burkholder. I thought I would give you a little background on how I got myself hooked on tractors and their restoration. My family is a very "crafty" bunch of people. By crafty I mean good with crafts!! My Dad is a retired industrial engineer from Bucyrus Erie which made big shovels for excavating and he is also a wonderful wood worker. My mom and my "guardian angel" has had her own ceramic shop for 30 years and is an excellent painter. With these skills always active in our house it was hard not t
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