Does not make sense, check hydraulic pump, filter and suction line.
Following diagram in WSM for hydrostatic transmission
Pump section 1 goes to
Front Hydraulic Block (Loader should connect to this)
AUX remote block (rear remotes)
3Point position control valve
Pump section 2 goes to
Power steering control valve
Oil cooler
Servo control valve(foot peddle controls this flow to actuate piston for the swash plate)
PTO clutch valve
Hydrostatic transmission.
David