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Cold Hydraulics on A/C 7000

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Aaron Baugher

01-03-2002 15:55:16




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My dad has a 7000 that's had a cold-weather problem with the hydraulics for a few years now. When it gets cold (below 20, I guess), the hydraulics don't work until the tractor has warmed up for 15-20 minutes. Also, while it's warming up, there's an intermittent noise that sounds like the hydraulic pump is straining -- the same noise you get when you push the level to lift something and hold it there even when the lift has reached its limit.

Also, if you hold the hydraulic hose coming out of the pump, it throbs along with that noise like the pump is struggling. This goes on and off every few seconds until the tractor is fully warmed up.

We've replaced the hydraulic oil and filters, with no effect. Any other ideas what we should look at?

Thanks, Aaron.

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brent

01-03-2002 17:31:22




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 Re: Cold Hydraulics on A/C 7000 in reply to Aaron Baugher, 01-03-2002 15:55:16  
the noise you are hearing is probally the pump sucking air. when you changed the oil did you use a good grade hydrulic oil? also check the screen on the end of the filter i have seen them get pluged and varnished. i have also seen the suction lines get loose and damaged.



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steve

01-03-2002 18:40:57




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 Re: Re: Cold Hydraulics on A/C 7000 in reply to brent, 01-03-2002 17:31:22  
Brent is right, the noise is cavitation. That is common on lots of construction equipment i have seen that has heavy oil in it. I agree you should probably use a trans-hydraulic fluid from the Farm Store, it is normally equivalent to 20 wt oil. This fluid has special agents for water and anti foaming. If you are already using this and it still cavitates go to straight 10 wt hydraulic fluid. The noise is tearing up your pump. Long term it will be detrimental. Since is does not happen when warmed up that should eliminate most other possible causes.

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