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Tractor Talk Discussion Forum

PTO Pump speeds

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Sundance

11-28-2003 08:15:12




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I have an AC H3 loader, when the machine is cold the loader raises and lowers terribly slow, sometimes it takes up to 3o minutes before she starts to work at a comfortable level..... .Any clues as to what can be done, just short of rebuilding and replacing everything. Thanks




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JMS/MN

11-28-2003 19:29:03




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 Re: PTO Pump speeds in reply to Sundance, 11-28-2003 08:15:12  
Use the appropriate oil according to the ambient temperature. OPERATOR manual of your machine has that info.



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Paul Janke

11-28-2003 16:07:34




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 Re: PTO Pump speeds in reply to Sundance, 11-28-2003 08:15:12  
Pump suction lines pulling shut because of the vacuum the pump creates can be the problem. Go with large suction lines and hard lines for as much of the way as you can. A really short hose connecting two hard lines will often give the flex needed, but won't have room to collapse. I have seen many times when the inside of the hose pulls away from the outside, so just looking at it everything seems to be OK. Warm oil flows easier and therefore has less vacuum.

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Allan

11-28-2003 08:37:26




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 Re: PTO Pump speeds in reply to Sundance, 11-28-2003 08:15:12  
Sun,

Lighter or newer oil perhaps?

When it is cold, I think this is a normal occurance and if everything is working when it has warmed up, then the mechanics of the feller must be okay.

Just my thoughts,

Allan



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Sundance

11-28-2003 09:06:36




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 Re: Re: PTO Pump speeds in reply to Allan, 11-28-2003 08:37:26  
I would normally agree, however this is something that has just started to occur in the last two weeks. Prior to this the old girl was top notch.



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paul

11-28-2003 10:23:32




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 Re: Re: Re: PTO Pump speeds in reply to Sundance, 11-28-2003 09:06:36  
Please define 'cold' so we know what we are dealing with. Below freezing, below zero, or 'cool' :)

Look to a dirty filter or screen, or contamination (water) in the oil. If it works fine when it is warm/hot, the pump & all mechanical is in real good shape, look to some problem with the oil/ water/ dirt.

Sign of a bad pump is when it doesn't work when it's warm/hot.

--->Paul



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Sundance N.J.

11-28-2003 10:38:29




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 Re: Re: Re: Re: PTO Pump speeds in reply to paul, 11-28-2003 10:23:32  
Paul,
The last 3 to 4 weeks it has averaged about 47 degrees here in Jersey.....When I go out to the machine at pretty much anywhere between daybreak and noon, and start her up for the first time that day, that is when I have the problem...I did replace the filter in the early summer. I question the oil to use though.....I have not changed it and I bought the machine last year.
the res tank says to use SAE30 ND oil....and the local repair shop in Branchville told me to use a fluid medium hydraulic oil.....could this be the reason..... after all I really don't know what kind of oil is in the tank...(it's green and smells hydraulic)

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paul

11-28-2003 11:51:45




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 Re: Re: Re: Re: Re: PTO Pump speeds in reply to Sundance N.J., 11-28-2003 10:38:29  
Yea, that is tough with aftermarket hyd pumps, you would need to track down the pump manufaturer & find out what _they_ want you to use. Since we don't know where the resivor came from, hard to say if that truely is the label that matches the pump.... I'm not familiar with hyd systems that want 30 weight, but I've heard of it on some rare tractor that uses the same type oil in crankcase & hyd system.

You would probably be at the 30-40 degree temp where 30 weight thickens up & flows slower?

--->Paul

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Larry from MD

11-28-2003 09:35:09




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 Re: Re: Re: PTO Pump speeds in reply to Sundance, 11-28-2003 09:06:36  
I don't know about an ac but i would suspect a plugged intake screen or filter.



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