hassjb Posted November 29, 2015 Share Posted November 29, 2015 I have a home built press with a new 5hp, 220v, single phase motor, 5" cylinder and 2 stage pump that I can't remember the size of. Here's my problem. When I reach the end of the stroke on my cylinder the engine bogs and will stop totally if I don't release the control valve. My question is, does the pump have an internal relief? I replaced the control valve and that wasn't the problem so with a new motor and new control valve I'm leaning towards a faulty relief in the pump. Any ideas?...Joe Quote Link to comment Share on other sites More sharing options...
the iron dwarf Posted November 29, 2015 Share Posted November 29, 2015 it is very unlikely that your pump has a pressure relief valve built in, you need to add one and set it up to the correct pressure for motor load / cylinder / hose rating ( whichever is the lower ) Quote Link to comment Share on other sites More sharing options...
fergy Posted November 29, 2015 Share Posted November 29, 2015 Pic of your valve would help does it have an Allen key in it? Quote Link to comment Share on other sites More sharing options...
ianinsa Posted November 29, 2015 Share Posted November 29, 2015 Not wanting to be the "safety sissy " But. ........ a control valve without a pressure relief added can lead to interesting(read catastrophic) results. The motor bogging and stalling may be a poorly disguised blessing. Your profile doesn't give your location , however my personal experience has been that the places that supplied your kit /hoses usually have a hydraulic 'guru' on the staff and if you shlep the press to them they will usually take a quick look at it and advise you for free in the spirit of good customer relationships. Often it's just a 'didn't see the wood for the trees' thing sort of a 'duh' moment and sometimes it's a 'crickey just what was I thinking' . Good luck. Quote Link to comment Share on other sites More sharing options...
hassjb Posted November 30, 2015 Author Share Posted November 30, 2015 The control valve is a new Prince open center 2 way control valve with 2500psi relief. The fact that it doesn't reach the relief pressure now leads me to believe the 2 stage pump isn't switching over to the high pressure side, or second stage, causing the motor to bog. Possible? Quote Link to comment Share on other sites More sharing options...
fergy Posted November 30, 2015 Share Posted November 30, 2015 How do you know what pressure it is reaching? Quote Link to comment Share on other sites More sharing options...
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