Hydraulic Cooling Fan Reservoir

1. Reduce the fluid in the reservoir by half.
2. Attach the New Generation STAR (NGS) Tester to the vehicle.
3. Start the engine and command MAX fan.
4. Maintain 2,500 rpm. Fluid should be observed through the reservoir returning. The internal return also functions as a relief valve; fluid must be observed through the sides of the return. If the fluid is not returning through the sides the screen is plugged. If no or little return is observed or the fluid is returning through the pressure relief, install a new reservoir.