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Hydraulic Wisdom

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Rick B

05-21-2003 22:19:49

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Been pluging this board with Q's concerning my 3 pt hyd leak down problem. I rebuilt the lift ram and was still having a leak coming from the pump area (smalll bubbles coming up around the tube) I struggled with this doing all kinds of checks to pin point it, took the pump out and re-swagged the tube, checked and double checked for hole and cracks and still had the same problem. I had discounted the relief valve as there was no fluid coming out the end. Took the pump back out and did Zanes grease gun pressure test and sure enough grease squirted out the relief valve indicating no cracks in the housing. As a last resort I removed the relief valve for inspection and noticed the check valve that is part of the assembly had some slight galling. I suspected that maybe it was leaking which would back feed the pump housings as the lift drifted down. Replaced relief/check valve assemby and the lift will hold a bush hog up for days. I only wanted to share this as I didnt find a similar account in the archives. Wish I had just replaced that valve from the get go but I just have to know why things dont work before I start buying parts! Hope this helps someone.... Bman

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ZANE

05-22-2003 06:03:21

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Re: hydraulic Wisdom in reply to Rick B, 05-21-2003 22:19:49

Actually I am thinking that your problem was the relief valve alone and not the check valve. The fact that the grease gun test made the grease come out the relief valve and not the check valve should indicate the relief valve.

One thing my grease gun test lacks is the addition of a high pressure gauge to go in the pressure side of the grease gun hose but the reason I don't state this is that most people don't have a high pressure gauge but do have usually have a grease gun.

I hope someone will correct me if I am wrong but it is my understanding of the hydraulic pump that the check valve that is under the relief valve is there just to hold some residual oil in the pump chambers after the pump is shut down and has no bearing on holding pressure in the pressurized circuit of the pump.

One day when I have the time to kill I will remove the check valve from the pump and then use my grease gun test to see if indeed it does or does not have any bearing on holding pressure to the ram cylinder when the pump is standing.

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Rick B

05-22-2003 08:27:47

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Re: Re: hydraulic Wisdom in reply to ZANE, 05-22-2003 06:03:21

I realy appreciate your slick pump test Zane, saves a lot of suspicions about the integrity of the pump housings. I just have to say for all my efforts I never witnessed any flow or leakage at the relief valve. I assumed that the check valve held back the fluid after looking at the diagram in the FO4 manual (fig FO132,FO133) but I suppose it is subject to interpretation. I will still joyfuly defer to your expertise in these matters as I am yet wet behind the ears in the business of tractors. Many Thnx, Bman

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Rick H. Ga.

05-22-2003 04:55:42

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Re: hydraulic Wisdom in reply to Rick B, 05-21-2003 22:19:49

Hi Rick,

There is nothing wrong with being thorough and you fixed your problem. I don�t like to guess when troubleshooting or just throw new parts at a problem either (although I have done it as a last resort). Rick H. Ga.

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souNdguy

05-22-2003 06:08:08

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Re: Re: hydraulic Wisdom in reply to Rick H. Ga., 05-22-2003 04:55:42

I too dislike the 'shotgun' approach of fixing things. I also dislike setting down to do the job and missing one small part... One of those 52 pickup problems. Oh well.. a few extra N parts laying around never hurt... I bought a new coil from DonB when I did an ignition tuneup last year, and thought I needed the new coil.. still have it in the box... though am sure that if I hadn't ordered it.. I would have needed it.

Reminds me of an old joke/story that used to go around about IBM computer techs that were sent out to diagnose/fix mainframe problems, and their methodology.... "What does an IBM service tech do when he gets a flat tire? Pulls over and begins changing tires one after the other, then checking to see if the vehicle drives correctly until the correct tire has been changed."

Soundguy

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Jim Cox SW Missouri

05-22-2003 09:38:24

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Re: Re: Re: hydraulic Wisdom in reply to souNdguy, 05-22-2003 06:08:08

the IBM guys' kids work here!!

jim cox

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Hayman

05-21-2003 23:38:25

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Re: hydraulic Wisdom in reply to Rick B, 05-21-2003 22:19:49

Thanks for the interesting comments.

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