I have a poor mix and it may be due to the poppet control rod slipping. How do I fix this? (Regarding the Model #1378 Mixing Machine)
With the counter at zero and the dasher at the top of its stroke, move to the rear of the machine. Locate the dasher rod arm (#10) and the set screw holding the poppet control rod (#13). Loosen the set screw using a 3/32nds allen wrench. Push the rod up as far as it will go. You may feel a slight spring resistance due to it coming in contact with the poppet valve. This is normal. Tighten the set screw with the rod all the way up. If you change this screw, be certain that it is replaced with a knurl cup set screw.