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TO-20 hydraulic pump

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Dave

09-13-2002 16:02:24




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I pulled my hydraulic pump, seen drawings from parts manual and this web sight but still confused. I understand that the cam/PTO action pumps liquid by pistons but how does the liquid/hyd. pressure reach the piston assembly cylinder. I understand the mechanics of the pump hand control, fork assembly and pump control valve, but through which tube, or whatever, does the hyd. pressure get to the above assembly cylinder and thus push the connecting rod out and thus raising arms? Going to install a pump and want to fully understand how it works first. Need help, thanks, Dave

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phil fenner

09-16-2002 11:13:54




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 Re: TO-20 hydraulic pump in reply to Dave, 09-13-2002 16:02:24  
Just add my 2 cents worth of info. The overhaul manual explains how to get the tube out and the new one in and it does sound delicate at least putting the new one in. Getting the old one out sounds easy but you destroy the tube in the process but who cares.

Phil Fenner



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rod

09-13-2002 16:52:12




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 Re: TO-20 hydraulic pump in reply to Dave, 09-13-2002 16:02:24  
there is a tube in the front right corner of the housing that goes up to the top cover assembly and fluid is carried to the cylinder if you take a look at the top cover assembly you will see what I mean if you took the four bolts in center of top cover off the cylinder assembly would come right off and you can see the port for fluid to flow thru it has a gasket on it also so do not take it apart unless you intend to work on it.
regards

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Dave

09-13-2002 19:10:27




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 Re: Re: TO-20 hydraulic pump in reply to rod, 09-13-2002 16:52:12  
Rod, thanks for the info. I have not seen the tube. I have both ports off and of course the bottom housing of pump. Is the tube "free hanging" or actually built into the tractor?



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rod

09-13-2002 19:20:47




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 Re: Re: Re: TO-20 hydraulic pump in reply to Dave, 09-13-2002 19:10:27  
the tube can come out but I have not taken one out so have no idea how to do it. IF you send me your email I will scan a parts pic and send it to you.
regards
rod



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Dave

09-13-2002 20:01:22




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 Re: Re: Re: Re: TO-20 hydraulic pump in reply to rod, 09-13-2002 19:20:47  
Rod, Thanks for the help. I have ordered a rebuild with a one year warranty out of Iowa. Thanks for the offer. Also, I would appreciate your scan. Where does the tube hook up on the old pump. (Front, back, Side) E-mail address above. Also, posted two pics of cracked pump to left under gallary - photos.



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Ray,IN

09-13-2002 20:49:17




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 Re: Re: Re: Re: Re: TO-20 hydraulic pump in reply to Dave, 09-13-2002 20:01:22  
Dave, The tube (steel) is swedged into the transmission casting, top and bottom. A gasket on each end of the tube holds the hyd. pressure where the top and bottom plates mount to the main casting. Occasionally these tubes rust through above the oil level line where condensation collects. Replacing this tube is a delicate procedure to avoid a leak. This is another reason to keep moisture out of your tractor.

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Dave

09-14-2002 07:03:08




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 Re: Re: Re: Re: Re: Re: TO-20 hydraulic pump in reply to Ray,IN, 09-13-2002 20:49:17  
Ray, Thanks for the info. Between you and Rod, I now have a better idea how the hydraulics works. Again, thanks for your time and information. Dave



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