Bobcat 641 skidsteer hydraulic problems.

the hydraulic temperature sender is typically located near the hydraulic oil cooler or the hydraulic tank. It may be mounted on the side of the oil cooler or tank, or it may be mounted on a hose leading to or from the cooler or tank.

Check out the filters,and is the proper weight oil for the hydraulic been changed lately and refilled with correct oil. May have air in the line as well, bleed the line

I don't know Bobcat systems like I do Toyota skidsteer, but on Toyota if the center foot pedal is pressed with no attachment connected, it will kill everything. Could that be happening to yours? Check into friction between your actuators for the attachment fluid drive.

Check for a broken oil cooler line or a hole in the flex hose

basically there are 2 points of control
1---is the control valve for that side which may not be opening the system
2--- the drive motor for that side which may be passing excessive oil and not turning
for the lift action to be slow indicates excessive pressure leakage in that circuit
early units had lever action to the control valves where as later units use electronic controls from joysticks to operate the valves
If this is your type of machine, I would be looking at faulty electronic control mechanisms or corroded wires and contacts

Did it run out of oil? if you ran the drive motors very long with no oil they are destroyed. Make sure the hyd. oil is still full. Usually the cylinders will act up first when oil is low. Try loosening the lines on drive motors to make sure there is no air in system, like an air locked injector.

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Oil cooler on that machine is for hydraulic oil. Is your fault for engine oil psi or charge psi? Charge psi unlocks brakes. Premature engine oil breaking down check for fuel in engine oil through lift pump or injection pump.

CHECK ALL THE SAFTEY SWITCHES ON THE SAFTEY BAR . IF THE UNIT MOVES FORWARD AND BACKWARDS THE SWITCHES AREN'T THE PROBLEM