1979 545 Loader Hydraulic PSI

Quick question having struck out with the search feature. I'm wondering what kind of PSI I could expect from the loader pump on my 1979 545. Loader is a 745 series model 19-858. I'm going to be doing some steel line pluming for my grapple in October and I want to make sure the lines, fittings are not rated too low. So for safety sake, lets assume I have a new pump running max intended PSI. I also have to locate my loader manual among my junk but that's my problem...

If I get time I'll plumb for my backhoe too but right now the grapple is my priority along with some bow hunting!
 
You can figure most common systems have a relief valve that pops off around 2500PSI. The pump makes flow the cylinders are what causes the PSI build up. Most hyd lines I buy say on them 4000PSI max which is a way for them to protect them self's
 

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