woolyAcres
Platinum Member
I just completed an overhaul of my tractor's (Yanmar YM240D) loader hydraulics. Now that everything is re-assembled I get a shuddering and screetching when I operate it and all 4 functions aren't working correctly. Could this just be air in the lines that hasn't been purged yet?
This overhaul included installing a new Brand Hydraulic joystick loader valve (replacing an older 2-lever arrangement) as well as moving the supply for this system from the tractor's main hydraulic pump to one that is mounted at the front and runs off a shaft sticking forward from the engine. The pump is working because I can see fluid returning to the tank. Raising the boom works okay but there is some shuddering and noise when doing so. Lowering works as well but there's shudder and screeching there. Curl and dump don't function as well, but during the overhaul, because the cylinders were vertical, with no hoses attached at one point, more fluid leaked out of them.
Additionally, the pressure relief valve (which should be set to 2000psi for this new valve) doesn't seem to be relieving pressure. I have a pressure gauge T'd into the system and it can/does spike at over 4000psi, nearly stalling the tractor.
Could this all be caused by air in the system that can/should bleed as I work through all the functions? Or should I be looking for other issues/solutions?
The noise and shuddering made me nervous enough to stop and think (and ask) about what's going on here. I don't want to damage the tractor, new loader valve, or anything else.
Thanks,
This overhaul included installing a new Brand Hydraulic joystick loader valve (replacing an older 2-lever arrangement) as well as moving the supply for this system from the tractor's main hydraulic pump to one that is mounted at the front and runs off a shaft sticking forward from the engine. The pump is working because I can see fluid returning to the tank. Raising the boom works okay but there is some shuddering and noise when doing so. Lowering works as well but there's shudder and screeching there. Curl and dump don't function as well, but during the overhaul, because the cylinders were vertical, with no hoses attached at one point, more fluid leaked out of them.
Additionally, the pressure relief valve (which should be set to 2000psi for this new valve) doesn't seem to be relieving pressure. I have a pressure gauge T'd into the system and it can/does spike at over 4000psi, nearly stalling the tractor.
Could this all be caused by air in the system that can/should bleed as I work through all the functions? Or should I be looking for other issues/solutions?
The noise and shuddering made me nervous enough to stop and think (and ask) about what's going on here. I don't want to damage the tractor, new loader valve, or anything else.
Thanks,