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NAA Hydraulic Pump

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Glenn (MD)

04-23-1999 09:37:10

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...the hydraulic pump that is a new, rebuilt from the factory, fresh out of the box model makes a very loud knocking noise, and the hydraulics don't work.

Is this a sure sign that the hydraulic pump is no good or can faulty valves in the back cause the pump to behave this way? Or is there air in the pump? I am reluctant to run the tractor at all with the pump acting this way for fear of damage to the cam or crank.

I am faced with an $800 rebuilt piston pump, $310 rebuilt vane pump, or used piston pump if I can find one. I am trying to see all the possibilities before I make yet another large purchase.

BTW... I am using 134 hydraulic fluid from New Holland.

- Glenn

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04-24-1999 10:43:29

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 Re: NAA Hydraulic Pump in reply to Glenn (MD), 04-23-1999 09:37:10  
Did you prime the pump?
You have to fill the pump with oil first. If the pump is installed, remove the input line and loosen the output line. Then inject oil into the input port until oil starts to run out of the output port. Tighten output line and fill pump.
Re-install the input line.
Try this. Your valve should not be the problem.
If the were good before.

The knocking was caused by the pump being dry.

Hope this helps

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Thanks...Glenn (MD)

04-25-1999 18:52:51

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 Re: Re: NAA Hydraulic Pump in reply to Mike, 04-24-1999 10:43:29  

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