dnetherland
Member
I posted this in the Mahindra section but haven't had a lot of input. Any help would be greatly appreciated.
I have a Mahindra 4005 with TAS loader and one set of auxillary outputs. The hydraulics seem to be getting weak over the last several months. Loader lift capacity seems to be less and movement slower. Three point hitch seems slow and will let implements drift down if very heavy. I have changed fluid and cleaned the screen (no filter). Initally function seemed better but after a few hours and when the tractor got hot the problem recurred. I plugged in a pressure gauge to a loader port, then to a remote outlet. When i work the loader or the remote outlets pressure will go up to about 1800 psi and then quickly drift down to 800 psi and stabilize. If I keep working the hydraulics max pressure falls to about 1600 psi and drifts down to 600 psi. Manual says max pressure should be 2400-2600 psi. Fluid is clean and I see no major leaks. The tractor has about 800 hours. Too few to have the pump to fail but when I changed the fluid the first time I noticed a fair amount of metal on the screen. My thoughts are that the rapid leak down must be due to internal failure of the pump or failure of a pressure relief valve. There is a fast, slow control on the hydraulics which I would think acts as a pressure relief valve. I've cleaned it and set it to the fast setting and it has made no difference. I don't think the pressure relief on the loader is the problem since the three point lift and auxillary hydraulics are affected as well. I suspect the pump is bad. A new pump from the dealer is $700-$800. Can these pumps be rebuilt? Is it relatively easy to remove and reinstall a rebuild or replacement? I would appreciate any input before I spend $800 dollars on a new pump.
Thanks
Don
I have a Mahindra 4005 with TAS loader and one set of auxillary outputs. The hydraulics seem to be getting weak over the last several months. Loader lift capacity seems to be less and movement slower. Three point hitch seems slow and will let implements drift down if very heavy. I have changed fluid and cleaned the screen (no filter). Initally function seemed better but after a few hours and when the tractor got hot the problem recurred. I plugged in a pressure gauge to a loader port, then to a remote outlet. When i work the loader or the remote outlets pressure will go up to about 1800 psi and then quickly drift down to 800 psi and stabilize. If I keep working the hydraulics max pressure falls to about 1600 psi and drifts down to 600 psi. Manual says max pressure should be 2400-2600 psi. Fluid is clean and I see no major leaks. The tractor has about 800 hours. Too few to have the pump to fail but when I changed the fluid the first time I noticed a fair amount of metal on the screen. My thoughts are that the rapid leak down must be due to internal failure of the pump or failure of a pressure relief valve. There is a fast, slow control on the hydraulics which I would think acts as a pressure relief valve. I've cleaned it and set it to the fast setting and it has made no difference. I don't think the pressure relief on the loader is the problem since the three point lift and auxillary hydraulics are affected as well. I suspect the pump is bad. A new pump from the dealer is $700-$800. Can these pumps be rebuilt? Is it relatively easy to remove and reinstall a rebuild or replacement? I would appreciate any input before I spend $800 dollars on a new pump.
Thanks
Don