Fluctuations in mortar consistency (mortar flow “thick – thin”).

Possible causes:

• Material clogs, narrowing the mixing tube inlet. The mixing shaft or pump might be worn out. Clean mixing shaft, mixing area and pressure flange. Inspect mixing shaft and pump components. Replace if necessary.

• Pressure reducing valve misadjusted or defective. Increase water supply by 10% for approx. ½ minute and then turn back slowly. Reset pressure reducing valve to factory setting.