1. Remove the 4 screws fixing the pump head. The screw location is on the back of the metering pump. 2. Check if the drain pipe is installed and the drain valve is closed? The drain valve needs to be opened during the priming phase of the metering pump. Note: Not all metering pumps have a drain valve. 3. After the diaphragm is installed and the leakage hole of the back plate is placed in the vertical position, install the pump head. Make sure that the suction valve is aligned with the leakage discharge hole, and the screw on the liquid end is aligned with the corresponding 4 holes.
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