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Harry Ferguson Tractors Discussion Forum
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Hydraulic presure relief valve

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Mike

03-23-2004 03:38:18




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To cut a long story short I need to replace the top hydraulic cover (the one with the seat and lifting arms attatched) on my 1952 TED20. Fortunatly I have a spare cover off a 1949 TEA20.
However closer inspection revealed that whilst the two covers can be interchanged the one off the TEA has no presure relief valve whilst the one currently on the tractor Iam trying to repare does! Will this be a problem, I can't remember if there is a second presure relief valve in the pump and if this alone will be sufficant to prevent potensial damage?

Many thanks, cheers Mike

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Jim W

03-23-2004 05:08:23




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 Re: Hydraulic presure relief valve in reply to Mike, 03-23-2004 03:38:18  
No, you have a problem. The pump that goes with the early cover had a relief valve built in, and the pump that goes with the later cover does not. Does your earlier cover have the hex head screws, one on either side, where the later cover has the relief valve? (The very earliest covers didn't have those either.) If so maybe you could machine a recess in the left one and install the relief valve from your later cover. (If there is enough metal there - I'm not sure.)
Failing that you're looking at finding the older hydraulic pump to match your cover. Could you get it from the same TEA? Maybe trade for your present one?
Jim

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Mike

03-26-2004 05:09:37




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 Re: Re: Hydraulic presure relief valve in reply to Jim W, 03-23-2004 05:08:23  
Thanks for the help Jim. There is a recess and a hex screw on the cover, where the presure relief valve should be located. It looks well and trueley rusted on though and I don't like my chances of undoing it! Even if I do get it out then I can't see how I will install the presure relief valve off the other cover since the thread for the hex screw is much small in comparison with the thread on the presure relief valve. What was the original purpose of this small hex screw, if the presure relief valve for the older models is located in the pump then why put it in at all?

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Jim W

03-26-2004 06:56:57




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 Re: Re: Re: Hydraulic presure relief valve in reply to Mike, 03-26-2004 05:09:37  
I do not know but suspect it made the cover easier to manufacture. The very earliest ones had no setscrew or hex screw, and that they were able to cast that channel in there at all amazes me.
For the later covers my guess is that they just drilled the channel through from one side to the other, and then plugged the ends with the set screws. It does make a handy take-off point to rig up some kind of external hydraulics. It's a 3/8" pipe thread, so I would rather use that point than the front right corner of the pump, which is alumin(i)um.
Back to your problem though, now I am wondering if the body of the pump still has a boss cast in it that could be tapped and a relief valve installed. I have one in the garage; I will try to remember to take a look. Well, of course you could take a look at yours. If they left it there that would be an elegant solution.
Jim

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