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Ford 861 hydraulic piston pump

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06-17-2015 09:19:32

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I am rebuilding my piston pump and wonder about the valve seats. I see where some have been able to remove the seats by grinding a long screw head to make a puller. How about installing the new seats, can you just drive them in with a punch to fit? Any tricks to help? Also is it really necessary to remove and replace the seats in the first place? My pump was sucking air and loosing prime. It also has lost the ability to lift the brush hog but the lift arms work ok when the hog is removed. Is this because of air in the lines or some internal leakage? I guess I will find out after I get the pump fixed! But the fact that the lift arms raise unloaded tells me the linkage to the control valve is working ok.....right?

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06-17-2015 13:51:34

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 Re: Ford 861 hydraulic piston pump in reply to waynemo, 06-17-2015 09:19:32  
Thanks for the help. Also the seal is a double lip with a spring on each lip and the rubber on one end is slightly larger and also the steel part where you drive it is larger on one end. Question is which end goes in first?????

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06-17-2015 13:42:09

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 Re: Ford 861 hydraulic piston pump in reply to waynemo, 06-17-2015 09:19:32  
I used a 16P spike in a vise grip, like a slap hammer. They gave up real easy. Just tapped the new ones in.

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06-17-2015 09:58:04

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 Re: Ford 861 hydraulic piston pump in reply to waynemo, 06-17-2015 09:19:32  
I faced the same seat issue when I rebuilt my 660 pump. I inspected the seats and they looked just fine, so I did not replace them. I did put in new balls and springs. I would say that you should not replace the seats unless you have a real reason to do so.

BTW, my pump has been running perfectly for 4 years now.

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