How To relieving pressure from a hyd press system.

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kurtmm

Joined
Jan 26, 2022
Messages
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I have an engorged pressure line to my hyd press going to the pump and the gauge reads at 500psi. I would like any responses as to how to go about fixing please. Thanks,.
 
Danke42 said:
The pump should have a bleed screw somewhere. Post pics.
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It's a Northern tool purchased pump and I am having trouble posting pictures right now on the forum site. It keeps asking for a http.. when I try to send from my phone gallery! Thanks for responding.
 
You have to use a 3rd party site to post pics. I use imgur, there are lots of others. Otherwise you have to have a paid membership to post pics directly to the forum.

KingMC

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Might be a bleed off on the cylinder on the press too.
 
Assuming the gauge is 1/4” NPT and directly connected to the pressure line, you can simply back out the gauge a half turn or until you get a drop or 2 of oil weeping out of the thread. Do this very slowly and insure that the pump is off and locked out. It really should only take a teaspoon full of oil removed to drop the pressure to 0, assuming of course that the pressure line is not too long and about half inch wide. Once the pressure is removed, take the gauge out and T in a needle valve with the exit returning to the reservoir.
 
Onies said:
Assuming the gauge is 1/4” NPT and directly connected to the pressure line, you can simply back out the gauge a half turn or until you get a drop or 2 of oil weeping out of the thread. Do this very slowly and insure that the pump is off and locked out. It really should only take a teaspoon full of oil removed to drop the pressure to 0, assuming of course that the pressure line is not too long and about half inch wide. Once the pressure is removed, take the gauge out and T in a needle valve with the exit returning to the reservoir.
Click to expand...
Thanks, I will try that.
 
I know I'm late to the game but heavy equipment mechanic by trade almost 30 years. I'd just crack the line with an open end wrench with a rag tied around the 2 areas it's going to come out of(top of fitting at hose and bottom of fitting at connection. If you can get a half turn before it blows out grab the hose and give it some wiggles it'll probably release. If not another quarter turn and repeat. 500 is really not that exciting. Turning out the gauge it only has one escape path and it's a tapered pipe thread; you're liable to just launch the gauge, break that and make a nice mess.
 
Onies said:
Assuming the gauge is 1/4” NPT and directly connected to the pressure line, you can simply back out the gauge a half turn or until you get a drop or 2 of oil weeping out of the thread. Do this very slowly and insure that the pump is off and locked out. It really should only take a teaspoon full of oil removed to drop the pressure to 0, assuming of course that the pressure line is not too long and about half inch wide. Once the pressure is removed, take the gauge out and T in a needle valve with the exit returning to the reservoir.
Click to expand...

aareeyesee said:
I know I'm late to the game but heavy equipment mechanic by trade almost 30 years. I'd just crack the line with an open end wrench with a rag tied around the 2 areas it's going to come out of(top of fitting at hose and bottom of fitting at connection. If you can get a half turn before it blows out grab the hose and give it some wiggles it'll probably release. If not another quarter turn and repeat. 500 is really not that exciting. Turning out the gauge it only has one escape path and it's a tapered pipe thread; you're liable to just launch the gauge, break that and make a nice mess.
Click to expand...
Do you mean the highest line on the machine? Which in my case would be connected to the piston. (Cylinder). Here is my email so as I am unable to send pictures
"Not that savvy w/IT! kurtmares@gmail.com then I can send a photo. Thank You.
 
Do you mean the highest line on the machine? Which in my case would be connected to the piston. (Cylinder). Here is my email so as I am unable to send pictures
"Not that savvy w/IT! kurtmares@gmail.com then I can send a photo. Thank You.
 
Hey sorry busy, busy with Christmas coming. You have what is called rod and head end of the piston. The cylinder side with the rod can get stuck because you have a bent rod and the head end has the highest force capacity and can get stuck because you got it bound up squishing something out of square. The head end is probably where the gauge is reading from but it could also be reading pump output and you have no idea where the pressure is stuck at. valves or centering springs could have issues. But 500 psi makes me think nothing's too badly wrong, or your gauge is broke. But just pick what's easiest to get to, tie some rags around the fittings like said above and start making a mess. Because that's what you're gonna have. Buckets and drip pans are optional but encouraged. I'm assuming you've tried moving all the controls and everything a reasonable person would do before tearing stuff apart.
 
aareeyesee said:
Hey sorry busy, busy with Christmas coming. You have what is called rod and head end of the piston. The cylinder side with the rod can get stuck because you have a bent rod and the head end has the highest force capacity and can get stuck because you got it bound up squishing something out of square. The head end is probably where the gauge is reading from but it could also be reading pump output and you have no idea where the pressure is stuck at. valves or centering springs could have issues. But 500 psi makes me think nothing's too badly wrong, or your gauge is broke. But just pick what's easiest to get to, tie some rags around the fittings like said above and start making a mess. Because that's what you're gonna have. Buckets and drip pans are optional but encouraged. I'm assuming you've tried moving all the controls and everything a reasonable person would do before tearing stuff apart.
Click to expand...
Thank you for the advice and your time, I will try relieving the pressure from the line into the pump by loosening the upper cylinder hose as it is the topmost line of the system. It may cause a mess so I will use your recommendation of lots of rags. Thanks again and Merry Christmas and Happy new year!
 
Thank you for the advice and your time, I will try relieving the pressure from the line into the pump by loosening the upper cylinder hose as it is the topmost line of the system. It may cause a mess so I will use your recommendation of lots of rags. Thanks again and Merry Christmas and Happy new year!
kurtmm said:
!
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