Hydraulic pressure

Before the relief valve? I test the hyd pump after the oil is up the operating temp and a good pump will easily get to 23-2400 lbs. I have not had the guts to take them higher in fear of damaging something. Rod.
 
Thanks Rod. I'm getting some huge readings of 3000+, and my gauge only goes to 3000. Is this possible, or maybe it's my gauge. It's a new one but on the cheap side. But I was getting a reading of 3000+ before and it blew the hose the gauge was on. Don't know what's going on. Is it possible for the hydraulic system to run really high for some reason? I inspected the hy filter and it was ok, from the thought of back pressure. Mark
 
You should be testing the pressure at the remotes, which will give you the relief valve pressure. Do not test the pressure coming directly out of pump unless you have the proper test equipment. Rod.
 
Those tests were from the remotes. I have taken the dual remote housing out 4 times so far addressing the high pressure problem. The piston and sleeve in the main relief were replaced. Mechanics have done this too, not me. I'm trying to figure out why the hydraulic pump would perhaps put out so much pressure in the first place. My last idea was perhaps the piston was stuck closed and so was giving me max pressure straight from the hy pump. Mark
 
the hydraulic flow from the pump goes straight to whatever valve you have actuated and as the cylinder or whatever reaches full stroke the oil pressure builds against the relief valve, the valve is in circuit in a T configuration and does not tell the pump how much pressure to make, rather it opens and allows oil flow to go back to sump, the pump is just a fixed displacement pump dependent on rpm to vary it's output. If all is good in the relief valve mechanically then it is quite possible that the relief is improperly shimmed, they have a very strong spring and .015-.020 thousanths increase in shimming can easily put the pressure way high
 

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