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First we swapped the hydraulic lines where they go into the control unit: boom for swing and that seemed to transfer the problem to the swing. That showed the problem was in the block where the boom cylinder lines connect to the control unit and not a problem with the boom cylinder. Put the...

File names sort of tell what you're looking at. The pic of the high pressure relief valves on top of the unit shows that the one on top of the boom block had recently been handled and cleaned off. That must of been pulled by the dealer mechanic when they did the pressure test in the boom block...

Success! Or so it seems. I haven't had a chance to a lot of digging to be 100% sure but it seems like we got it figured out cuz the boom doesn't suddenly drop or fail to respond while under load. The best part is that we found a problem that I can point at and say - yup, that was it! Very...

We swapped the hydraulic lines for the boom and swing cylinders and the problem moved to the swing cylinder so I have no doubt that something inside the boom control valve block is allowing pressure to slide by. We've got two hours into the project and a greater appreciation of what a PITA it...

We're into the project and I can see why it has an estimated 8-9 hours of labor. Thought we'd do a quick swap of the hydraulics for the swing and the boom and that would allow me to test the boom cylinder while the swing was then problematic. The blocks are next to each other on the Control...

It happens, right? But, this issue happens when I'm trying to dig and the boom droops and I have to wait to get 'pressure' back in order to keep digging. Just the Boom cylinder is effected. That's why I need feedback on rebuilding the Control Value block where the Boom lines come in to the unit.

The boom cylinder is drooping on my BH77 which is on a 2008 L3400 HST with 600 hours. There is no fluid leaking anywhere. I put a blue Viagra pill in the hydraulic reserve, but it still droops overnight. Haha... anyways, when digging and the tractor is warmed up it suddenly won't lift the arm...