Check for leaks in the intake hose from the coolant tank.
Make sure that the tank lid gasket  is not damaged, and that it is clean. Make sure that the latches are tight and locked. Do not over-tighten the latches.
Replace the auxiliary filter, refer to the Auxilary Filter - Bag Filter - Replacement Procedure.
Use the wash down hose or the standard coolant pump to fill the auxiliary filter tank.
Cycle the power to the coolant pump to clear the empty chambers of air until the pump runs smoothly.
Drain the auxiliary filter tank. Remove the cover from the auxiliary filter cart.
Clean the auxiliary filter vacuum-generator assembly: Remove the components as shown in the illustration. Remove all of the chips that clog the supply hose in the coolant tank, the fittings, and the pipes.
Pumps without the vacuum generator have a prime line fitting  and an air bleed valve . Clean prime line fitting  and the air bleed valve . Make sure the prime line fitting  and the air bleed valve  are not clogged.
The oil level in the reservoir rises when the pump is hot and in operation. Check the oil level in the oil reservoir  when the pump is cold. Fill it to the cold fill line  with 5-30W synthetic oil.