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Re: NAA weak hydraulic pump?

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04-30-2013 10:02:53

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My first thought was that you had a major leak in the lift piston. Since you have checked that and it appears OK, I would check the pump further

Is the lift jerky or smooth? If its jerky, I would try bleeding the pump by the pipe plug on the top - front of the pump. If you are up for a task, pump in a clear plastic hose and run it to the fill hole under the seat. Start the tractor. If you see bubbles running though the plastic tube, you have a suction side air leak. If you just see oil, I'm thinking you might have a few broken or worn check valve springs inside the pump.

If it were mine, I'd bleed that pump and see if it improves things. Just break the pump bleed plug loose (just a bit) and run the tractor at slow idle. Loosen the pipe plug just enough for oil to flow. You may see bubbles. Once its only oil, tighten the plug and check the lift. Be careful, if the plug comes out with the tractor running, you'll be moping up oil all over the barn.

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04-30-2013 10:42:16

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 Re: NAA weak hydraulic pump? in reply to Kurt-NEPA, 04-30-2013 10:02:53  
The lift is smooth, but very slow. If it sits more than a day I have to bleed the air from the pump at the pipe plug on front of pump. When bleeding the pump it takes 20-30 sec to go from bubbles to oil to get the air out.

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04-30-2013 11:12:33

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 Re: NAA weak hydraulic pump? in reply to TunaIL, 04-30-2013 10:42:16  
A slow or weak piston pump and no air might be the check valves or check springs are wore out or gone, in the pump.

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