1. Remove the four screws that hold on the liquid end. The screws are located in the back of the pump.

2.Once the liquid end is loose, before removing it, turn the stroke length down to 0%.  This insures that the soleniod shaft will have enough pressure on it to hold the assembly stationary, which allows the diaphragm to spin off.

3.Pull the liquid end out far enough to disengage the screws from their slots. Grab the liquid end and rotate it counter clockwise. The diaphragm, will spin off with a little resistance.

5. After the diaphragm is installed and the backplate weep hole is situated vertically, install the liquid end. Make sure that the suction valve is aligned near the weep hole and that the liquid end screws  are aligned with the four corresponding holes.

6. Turn the stroke length up to 100%. This allows the complete assembly to spin so the backplate weep hole may be aligned at the bottom. The liquid end and diaphragm will adjust to this postion while the pump is running.

7. Once the liquid end is seathed in the proper direction along with the backplate the four bolts may be tightened in an X pattern untill snug. Then an even torque is applied to finish the job.