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Re: NAA lift suddenly stopped

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Author  [Modern View]

04-11-2013 18:08:15

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Bill, your is your pump the square vane style or the later round case piston pump?

It may need to be primed, but it can be tested.

Some of the guys here helped me with mine when it wouldn't work.

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B Seifert

04-12-2013 10:29:42

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 Re: NAA lift suddenly stopped in reply to Royse, 04-11-2013 18:08:15  
Yes I have the old vane pump. I suppose it could have lost prime, but why after all these years(owned since 1988). Also using #90 grease it seems like it might not lose prime as easy as it could using lighter hyd. oil. I know vane pumps don't have as much suction as a gear pump. Most likely maybe the pump went bad. Although I work with hyd. systems most everyday, I did not see an easy way to hook any type of guage on to the pump. Thats because the pump has bolt on flange/rigid pipe design outlets with no easy way to T in a pressure guage.

Who can tell me where or how to check this pump without tearing it all apart? Bill

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Bill Rowles

04-13-2013 07:59:26

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 Re: NAA lift suddenly stopped in reply to B Seifert, 04-12-2013 10:29:42  
If you are using 90 weight gear oil in the hydraulic system, that is likely the problem. In cold weather, the gear oil causes the pump vanes to "stick" and not slide out to contact the elliptical pump it won't pump. Try changing to less-viscous oil and prime the pump with air pressure as suggested by JMOR.

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04-12-2013 14:10:17

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 Re: NAA lift suddenly stopped in reply to B Seifert, 04-12-2013 10:29:42  
Quoting Removed, click Modern View to see

Unlike the piston pump, there appears to be no inlet & outlet plugs on the pump itself to permit the release of air (outlet) nor on the inlet/suction to allow the introduction of hydraulic oil. This leaves the outlet release point as the test port plug on the lower right side of center casting, near foot board/right brake. You can remove that and start to see if air on outlet is keeping it from pumping. I think this is not a high likelihood. Introduction of oil into the inlet is probably a better shot at success. This is done by applying compressed air to the dipstick hole with an air compressor blow-gun to help force oil up into the pump inlet. Other option is less desirable. Remove the pump, turn it upside down and fill it with oil, work pump to thoroughly coat insides with oil, being sure it actually pulls in oil at intake & forces it out the outlet when rotated. Pour oil into the suction line...gravity will never let you fill the line, but at least some oil will now be known to be in the line. If you need pictures of the test port location, view picture.

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B Seifert

04-23-2013 15:42:44

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 Re: NAA lift suddenly stopped in reply to JMOR, 04-12-2013 14:10:17  
OK guys I had it working, but it loses prime if it sits more than a day or so.

I took the pump apart and found that the main seal on the shaft is hard. I believe it is sucking air and losing prime.

I think with a speedy sleeve on the shaft and a new seal it will work again. Problem is : Where do I get a seal for this vane pump. The avenues I have persued have so far come up empty. Any help would be appreciated. Bill

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