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Message: <blockquote data-quote="Tazza" data-source="post: 10840" data-attributes="member: 82">I think i understand them now.If you look at your control block for the section that controls the lift arms, it has a relief valve installed, i think its around 5,000 PSI. I spoke to my local dealer about this and he said its to protect the lift rams and hoses from pressure spikes generated if a load was to be drooped on the bucket. Basically when the spool is in centre no oil can flow either way, so essentially if you got a ram and pit it in a press you could create so much pressure that the cylinder or hoses could rupture.Now for the why its needed, with the hoe attached to the QA plate. You have more leverage with the extra boom length and powerful hydraulic cylinder for the bucket curl. You hook into a hard bit of rock that would pull at the tilt ram causing excessive pressure, essentially like i said earlier with putting the ram in a large press. I do believe the cylinders and hoses could take the extra load but it also puts more load on your pins and where the stick is welded at the bobtach.As for where to install the relief, look at the back of the control block, there will be a round plug rite next to the alloy cup that holds the centering spring, thats the plug you want. The ones facing the LH wheel either side of the ports are your load checks.If any of that doesn't make sense i'll try and explain it a bit better.</blockquote>