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Installation Instructions for the MOTORIZED Simple Pump System (Scotch Yoke Drive option) page 4

Section 3: Prepare Your Existing Pump

Check Pump Function

Your Simple Hand Pump should already be installed and pumping water without any binding and with an overall smooth operation prior to attempting to install this motor assembly. You should confirm that your pump is delivering at least one gallon of water with approximately 25 strokes with the lever handle system (model 100L). If you have the model 125L, your pump should be delivering about one gallon of water in approximately 14 complete strokes.

Once proper pumping function is confirmed, remove all hardware on the top of the pump head. 
Starting with a fully-functional lever-arm pump, what follows are the step-by-step installation instructions.

 

Remove the lever arm mechanism:

Using the 3/16″ Allen wrench, remove each of the four fasteners holding the lever arm mechanism to the pump head.

Remove the lever arm bracket and lever (they should still be connected) from the 3/4″ stainless rod.

The direction you screw is the opposite of normal — turn clockwise to remove, rather than the normal counterclockwise.

Push the pump rod fully down. The length of the white arrow in the picture should be no higher than 3-3/4″ from the top of the stainless steel rod down to the shoulder (metal top) of the head (right).

If this is not the case, an adjustment in pipe length may be required.