Is 2400 psi at idle with cold oil (55-60 degrees) too high, as in that high of pressure will damage components?
The story. Back in 2022 the PTO clutch went out and was replaced by the local Case dealer. They tried to clean it up inside as best they could from the clutch fibers getting in things, but afterwards, the 3 point did not work right. When it was cold, it wouldn't raise, after the oil warmed up it would raise. I lived with it like that for a while because the tractor doesn't get a lot of use. Then, this winter with the snow blower on the 3 point wouldn't raise it, either warm or cold.
A local mechanic came over and put a hydraulic gauge in the remotes and it was only making about 200 psi. He then put a flow meter on it and the pump easily produced 15 gpm at 2000 psi at a bit over idle speed.
So, we tore into the auxiliary valve and put essentially all new relief valve parts in it. I say essentially, as the relief valve sleeve is a pressed in fit and appeared to be in good shape with no scoring on it to the touch so we didn't replace it. We replaced the piston, piston assembly, the main spring and orings associated with the relief valve. We also replaced the orings and gaskets under each side head and the nylon washer that seals the valve to the tractor.
We did identify a possible issue with the piston assembly for the relief valve as there were a couple shiny spots on it like it was rubbing on one side more than the rest. We also identified an issue with the main relief valve spring as it was measuring 20-25 thousands short compared to a new spring. There were 6 shims under the cap on the relief valve and we left all 6 shims in per the advice of John Saeli, where we got the parts for the relief valve.
Anyway we got it back together tonight and tested it, with the cold oil (55-60 degrees), and it was making about 2400 psi of pressure at the remotes. The 3 point hitch also works normally as in it had no trouble raising the snow blower at idle speed.
So, my question is whether that high of pressure will damage components.
The story. Back in 2022 the PTO clutch went out and was replaced by the local Case dealer. They tried to clean it up inside as best they could from the clutch fibers getting in things, but afterwards, the 3 point did not work right. When it was cold, it wouldn't raise, after the oil warmed up it would raise. I lived with it like that for a while because the tractor doesn't get a lot of use. Then, this winter with the snow blower on the 3 point wouldn't raise it, either warm or cold.
A local mechanic came over and put a hydraulic gauge in the remotes and it was only making about 200 psi. He then put a flow meter on it and the pump easily produced 15 gpm at 2000 psi at a bit over idle speed.
So, we tore into the auxiliary valve and put essentially all new relief valve parts in it. I say essentially, as the relief valve sleeve is a pressed in fit and appeared to be in good shape with no scoring on it to the touch so we didn't replace it. We replaced the piston, piston assembly, the main spring and orings associated with the relief valve. We also replaced the orings and gaskets under each side head and the nylon washer that seals the valve to the tractor.
We did identify a possible issue with the piston assembly for the relief valve as there were a couple shiny spots on it like it was rubbing on one side more than the rest. We also identified an issue with the main relief valve spring as it was measuring 20-25 thousands short compared to a new spring. There were 6 shims under the cap on the relief valve and we left all 6 shims in per the advice of John Saeli, where we got the parts for the relief valve.
Anyway we got it back together tonight and tested it, with the cold oil (55-60 degrees), and it was making about 2400 psi of pressure at the remotes. The 3 point hitch also works normally as in it had no trouble raising the snow blower at idle speed.
So, my question is whether that high of pressure will damage components.