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Re: 660 hydraulics

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Author  [Modern View]

04-29-2014 05:25:10

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Billybuck said: (quoted from post at 07:08:55 04/29/14)
JMOR said: (quoted from post at 03:01:14 04/29/14)
Billybuck said: (quoted from post at 21:56:59 04/28/14) Jesse, you may recall I just replaced the cylinder safety valve
last Fall. Should the safety valve even open if there is not a
problem causing excessive pressure? The source looks to be
from the same spot as last fall though it was shooting out
probably because I had a bush hog attached when trying to lift.
No it should not open. It is only one of 3 sources that potentially dump back through the same un-gasketed path.

Since I replaced the safety valve last August and will do so again now, and hope it solves the problem, is there anything I should do to troubleshoot the cause of pressure build up? Seems if these safety valves can fail by staying open they could fail by not opening. Then what happens?
The ram cylinder safety valve in question is there to relieve excess pressure that occurs when the operator has a heavy disk or such lifted & runs too fast across furrowed ground, resulting in shock loading & high pressures caused by the bouncing of disk on 3 point. Zane speaks of the cylinder being ruptured on N tractor by this. This valve opening pressure is 2700 PSI, well above the 2000 PSI normal operating system pressure. A tractor could go a lifetime & never crack this valve. Once opened, it may trap trash on closing & leak. It should be very easy to verify such by removing & applying compressed air & feel/listen for a leak through the valve. If it leaks at 100-150 PSI, it has a problem. If mine, I would apply air pressure at test port on top of accessory plate & see if lift arms rise AND look and listen for leaks at this time. Under these conditions there is very little of the system exposed to pressure.......a few o-rings lift cover to acc plate & same to ram cylinder, the ram cyl safety valve, the check valve, control valve dump path and the ram cyl itself. If all OK, move forward with other checks. If not, you will have isolated the leak or at the very least isolated the search area.
This post was edited by JMOR at 05:28:12 04/29/14.

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04-29-2014 13:58:11

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 Re: 660 hydraulics in reply to JMOR, 04-29-2014 05:25:10  
My accessory plate has a valve built into it. Will that affect access to the test port?

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04-29-2014 15:47:59

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 Re: 660 hydraulics in reply to Billybuck, 04-29-2014 13:58:11  
Quoting Removed, click Modern View to seeAny 'accessory plate' that isn't the simple factory plate is wide open for what it is, so just set that valve to whatever position you would use when you want to use the 3 point and try it or send me information/picture of it.

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04-29-2014 19:18:10

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 Re: 660 hydraulics in reply to JMOR, 04-29-2014 15:47:59  
It will be a week from Saturday before I get back to it. I'll probably take the compressor and replace the safety valve again hoping that's the fix and try the air test if not. I'll message you a photo of the auxiliary plate if necessary. Thanks.

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04-29-2014 19:25:21

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 Re: 660 hydraulics in reply to Billybuck, 04-29-2014 19:18:10  
Quoting Removed, click Modern View to seesure. Like to see it.

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