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Installation Instructions for the MOTORIZED Simple Pump System
(Scotch Yoke Drive option)
page 7

Section 6: Initial Operation and Break-In

Once the power has been connected, install the fuse and attach the cover.

Adjusting for different loads. Five positions for the drive roller.If you have not already fastened the cam roller in the position that is closest to the crank arm’s center of rotation, you should do so now. In this position, the pump will generate only about 3/4� gallons per minute (GPM). Run the gear motor for two hours at this lowest setting.

Once the pump has run for 2 hours at the first stroke setting, disconnect the power, open the cover and move the roller to the next position. Run the pump for 2 hours at each setting. When you reach a setting that causes the fuse to blow within 2 hours, you know that you have exceeded the motor limit. Move the roller back to the previous setting and operate at that setting.

This will be the maximum pump rate for your well conditions. If you connect your pump to pressurize a house system or to an elevated storage tank, you will need to determine the optimum stroke setting using the same method as above, but under actual maximum pressure conditions.

During the break-in period, leave the pump outlet open or pump through a drinking-water quality garden hose unrestricted. We recommend a break-in period of at least 6 hours.

At all times, make sure that nothing is setting or stored on top of the gear motor.

Flow Capacities and Pressure with Model 100 Pump Cylinder

Maximum Total Head Flow Rate (GPM) Pump Stroke Setting
200 feet (86 psi) 1.5 5.8”
160 feet (69 psi) 2.0 6.9”
126 feet (54 psi) 2.0 6.9”
92 feet (40 psi) 2.0 6.9”
76 feet (33 psi) 2.0 6.9”

Flow Capacities and Pressure with Model 125 Pump Cylinder

Maximum Total Head Flow Rate (GPM) Pump Stroke Setting
150 feet (86 psi) 2.1 4.6”
123 feet (53 psi) 2.6 5.8”
103 feet (45 psi) 3.1 6.9”


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SIMPLE PUMP COMPANY, LLC
1140 Amarillo Drive, Gardnerville, Nevada 89460-7504