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180 hydraulic main relief valve
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ksbowman View Drop Down
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Joined: 19 Mar 2013
Location: Paola, Ks
Points: 228 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ksbowman Quote  Post ReplyReply Direct Link To This Post Topic: 180 hydraulic main relief valve
    Posted: 06 Nov 2021 at 4:37pm
Checked my Hydraulic pressure today at an auxiliary port and the pressure would go up to 1300 @ 2,000 rpm then drop to 1000. It would repeat this over and over so I assume the valve was popping out at that pressure. Tomorrow I'm going to adjust it as it should read 2,300. Is this much under pressure an indication the pump has worn bad or do the valves go out of adjustment that much thru use? 
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21451 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 06 Nov 2021 at 4:43pm
The seals inside the valve fail with age. You'll screw around trying to adjust and probably get nowhere. Then, if you take it apart to reseal it, the adjustment will be too high from messing with it earlier and you could split the pump wide open from too high of pressure setting. Any one I ever resealed, I never once had to change the adjustment....it was pretty much right where it belonged.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8510 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 06 Nov 2021 at 7:53pm
Yep on splitting pump
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rw View Drop Down
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Joined: 28 Oct 2009
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Points: 384 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rw Quote  Post ReplyReply Direct Link To This Post Posted: 06 Nov 2021 at 9:21pm
yep on splitting the pump also.rw
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ksbowman View Drop Down
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Joined: 19 Mar 2013
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Points: 228 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ksbowman Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2021 at 5:23pm
Rebuilt the main hydraulic valve today and the pressure holds a steady 1400#. May tke it back out and go thru it again. If the pressure doesn't change for the better I'll try readjusting it.
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DrAllis View Drop Down
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Points: 21451 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2021 at 5:33pm
Did you find any blown Orings or back-up rings ???
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ksbowman View Drop Down
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Joined: 19 Mar 2013
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Points: 228 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ksbowman Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2021 at 6:48pm
No back up rings looked bad but the o- rings especially the one  on the piston looked tired. I'll disassemble and really look closer at the back up rings. It amazed me how easy it was to get out and take apart on the bench. I had the shop manual out and the total it showed was 4 o- rings including the outers. That was how many I replaced was 4. Was careful to keep everything clean too.

Edited by ksbowman - 08 Nov 2021 at 6:49pm
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