Ok, if you can't tap into the main line try hooking a gage into the line going to the other end of the tilt cylinders and the lines to both ends of the boom lift cylinders. In all cases take the cylinder to the end of it's stroke and see what kind of pressure you've got. This will give you a good idea what the system pressure is without having to tap into the main line. If it were me I'd check the pressure on the boom lines first since that function seems to be OK. That said, just the fact that fluid comes out of the line really doesn't mean anything as even a worn out pump will usually create flow, but not pressure. It all depends on the wear, but I've flow tested systems before and seen pumps act perfectly normal until the system pressure reached a certain pressure at which point both the pressure and flow dropped to near nothing. At that point you could remove the load/pressure and the flow came right back up, but as soon as a load was applied and pressure started to rise it was right back to nothing. Unfortunately the only way to really check things that way is with a flow meter with valve to load the system. That is the best way to check a hydraulic system given that pressure and flow are tied together like they are, but in a situation where nothing but a cylinder is involved, the flow doesn't mean as much as the pressure since the only effect flow has on the cylinder is the speed it works, and has nothing to do with the amount of force it can exert.
As far as why one function works and not the other, like I said before, the tilt back and boom down functions are both working off the rod end of the cylinders where the tilt forward and boom up are working off the tail end of the cylinder without the rod. Using round numbers think about it like this. With 100 psi on the rod end, the rod takes away surface area from the piston so there is only 1 sq inch of surface area for it to act on. With the one sq in, the force put out by the cylinder is only 100 lbs. On the other end, without the rod, the 100 psi is acting on the full surface of the piston which is, say 4 square inches of area. This gives the cylinder 400 lbs of force. Ultimately between the differences in the area of force the pressure has to act on, and the mechanical advantage achieved by the way the cylinder is attached, it's not uncommon to see one function seemingly act normal, while the others show a definite problem. This happens until enough weight is put on the system for the problem to show with every function. It's hard to say if that's an issue here without factoring in the weight of the loads you have been carrying, the length of the 'levers' involved, etc, etc and doing the math, but I have seen that make a difference and cause a problem to show at point A but not B and C until a situation occurred that pushed the 'stronger' functions past their limit. Hope that makes sense as I don't know any other way to explain it.
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