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Discussion Starter · #1 ·
Hello all,
I have a hydraulic pump that is perfect for a fel project I am doing except it turns the wrong way. I took it apart and it seems like I can flip everything around . It has front and back plates, a center housing and a center gear cluster If I flip the center housing and gear cluster around will it pump? I am no hydraulic expert . :dunno:
Tom
 

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Discussion Starter · #3 ·
It turns CCW that is the problem . The tractor is a 73 MTD 990 , I want to use the pulleys on the flywheel side. I have the pump and want to use it if I can . I can just turn it around and mount it low , but it is really to far down for me to feel good about . If I can reverse it , I think It would work out better.
Tom
 

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Greetings Tom . Can't answer your question about the pump you have but have you considered trying to find a way to mount it to the front of the tractor with the shaft side to the engine ? I'm in the middle of a project adapting a snow plow to one of my tractors and I'm using a saginaw reverse rotation p/s pump and it will be mounted on the front of the tractor and it will be driven directly off the front pto shaft .

Mike
 

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Discussion Starter · #5 ·
Mike ,
That is option two. I would really like to mount this pump directly off the front shaft with a lovejoy coupler . To do this I need to turn CW . If I cant I will mount it oppisite the starter/ gen and run a belt. Are you using your pump to turn your blade ?
Tom
 

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Discussion Starter · #6 ·
Mike ,
I read that wrong. The rear of thre engine already has the driveshaft and the rear PTO for the deck . The space is limited. If I have to belt mount it , the front is the better option.
Tom
 

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You should be able to switch the pump around like you mentioned
 

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Mike ,
That is option two. I would really like to mount this pump directly off the front shaft with a lovejoy coupler . To do this I need to turn CW . If I cant I will mount it oppisite the starter/ gen and run a belt. Are you using your pump to turn your blade ?
Tom
Yes I am . Here's a pic to give you a idea how I'm doing it ..
 

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Discussion Starter · #10 ·
It is a gear pump .
Mike ,
that is exactly what I am looking to do. I am going to reverse the pump and do some tests with a gauge and deadhead the pump . See what blows up!
 

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Probably too late, but you never dead head a hydraulic pump. It will build pressure until the case fails, and that takes next to no time at all. The risk of injury from high pressure oil or fractured pump parts is not to be taken lightly.

Some gear pumps are not reversible.
 

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Discussion Starter · #12 ·
Not to late yet. So how do I test it before going through all the trouble to mount it . If I can move oil from one bucket to another at a good rate can I assume it will build pressure ? Would pictures of the pump help decide if it can be reversed?
Tom
 

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Bucket to bucket using an electric drill to turn the shaft. The drill will stall if the oil can't flow and that'll prevent any damage.

Pumps don't make pressure, they move fluid. They are designed to withstand the pressure created when the actuator does its work up to their pressure rating.

Pictures may help. If the manufacturers plate is still attached to the pump, or numbers are cast into the body, then you can go to the source with no guessing. From the limited view of your current pics, that pump looks to have a built in relief valve. If that is the case, it will only work in one direction.
 

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The symbol on the end plate says that it is a unidirectional pump and the cavity design bears that out.

Contact these folk for a definitive answer. The pics may help.

http://www.casappa.com/eng/02products/custom_design/special.htm

Click "Contacts" at the top of the page and "USA" on the left of the next page. They may be close enough that you can take it over and talk to them in person. You can get more info in person than with an email if you talk nice-nice.
 
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