Lman
New Member
I have a Case 9040B that bogs down and kills the engine when the bucket function is activated. Sounds like the pumps are going into full stroke when the bucket is just getting metered. I checked pump2 pressure and the pressure rises up to system pressure when the bucket is getting metered in both direction, no load. I checked negative control pressure, checked out good at 380psi at both pumps. Checked pilot pressure, checked out good at 580psi. System pressure checked out good. The problem is isolated to the bucket circuit only. I checked the pilot pressure on the bucket 2 spool side, checked out at 160psi when metering. Checked pilot pressure to the arm spool side, checked out at 160 psi when metering. Checked out all the control valve lines to make sure they are in there proper place, checked out ok. I swapped the arm 2 line with the bucket 2 line, the problem goes to the arm. Removed the bucket2/ arm2 spool, it looks good. I replaced the check valve and o-rings inside the spool. Installed the spool, still the same problem. The problem sounds like something is getting restricted or the pump is going into full stroke when not needed. The reason I think the pump is going full into stroke is because when the bucket in stalling the engine and I activate another function, the engine recovers and doesnt bog down anymore. Wierd thing is when I disconnect the bucket2 spool line, everything works fine, no more bogging down and stalling the engine. It does slow down the bucket speed though. Anyone ever seen this problem before? Any recommendations? I usually only work on deer machine, not very familiar with the Case machines. Thanks for any help an advance.