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Discussion Forum

B hydraulic pump

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07-11-2002 16:46:40

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My B's pump is giving me a fit. when the engine is cold or even if the fluid in the unit is cold the pump works fine and holds the harrows up fine, but when I use them for a while the I have to hold the pump handle up or the harrows will fall and then I only get about a half a lift. any ideas. Oh the fluid level is fine.

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07-11-2002 17:36:55

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 Re: B hydraulic pump in reply to markp, 07-11-2002 16:46:40  
Assuming that the fluid doesn't "thin" out when hot and leak out a worn seal, you may want to look for water in the lines. As the water/fluid heats up, the water can turn to steam with a different compressibilty coefficient than the fluid - hence you get partial lift. Just a few thoughts.

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07-16-2002 11:54:17

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 Re: Re: B hydraulic pump in reply to Mike, 07-11-2002 17:36:55  
Your Model BAC Tractor Pump is either worn or the Hold Valve is hanging in an open position letting the hydraulic pressure leak back into the system. If you are using the 20 or 30 weight oil, I believe that AC recommended when this tractor was new, you could try a 60 weight nondetergent oil in your system -- this would allow the pump to build more pressure through the thicker oil. If the Hold pressure plunger is sticking, you will have to remove the pump -- but you can also try a can of STP or other oil treatment that would maybe free up the plunger(just add treatment to your hydraulic oil). These pumps can be very tempermental.
Good Luck !!

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07-14-2002 09:48:57

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 Re: Re: B hydraulic pump in reply to Mike, 07-11-2002 17:36:55  
I'll check it when I work on it next week

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07-11-2002 19:19:52

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 Re: Re: B hydraulic pump in reply to Mike, 07-11-2002 17:36:55  
or the fluid is getting air bubbles in it, airation. what type of fluid are you using. I agree with Mike, my first thought would be to drain all three plugs on the bottom, see what comes out, then refill with hytrans fluid (about 2 gallons) buy at Wal Mart for $10.

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