Locating the Water Pump

Locate the Water Pump on a flat, level, sturdy surface capable of supporting the weight of the Pump.

1.For best Pump performance, place the Pump near the water level and use hoses that are no longer than necessary. This will allow the Pump to produce the greatest output with the least self-priming time. See diagram below.

Discharge Head

Total Head

	Suction
Water Pump	Head

As the head (pumping height) increases, pump output decreases. The length, type, and size of the suction and discharge hoses can also significantly affect Pump output.

Discharge head capability is always greater than suction head capability. This means pumping height for the Intake Hose (suction head) should be shorter than the pumping height for the Discharge Hose.

Minimizing suction head (placing the Pump closer to the water level) will also help reduce self-priming time. This is the time it takes the Pump to bring the water from the water level to the Pump during the initial operation.

2.Route the Intake Hose with the Intake Strainer fully immersed in the water supply source.

3.Place Strainer into water to be pumped. CAUTION:

Strainer must be fully immersed in water.

Do not operate Pump without Strainer connected to end of suction hose. Keep Strainer out of sand or silt by placing Strainer in a bucket or on stones.

NOTICE: If there is an air leak in the suction line, you may not be able to prime the pump. Use of a thread sealant is recommended.

Strainer

4.Secure the Intake Hose in place to keep it from moving once the Pump is turned on. The Intake Hose should be as short as possible for more efficient operation.

5.Route the discharge hose to the desired discharge location. If necessary, connect additional discharge hoses to direct the discharge to the desired location. Make sure to secure the discharge hose in place to keep it from moving once the Water Pump is turned on. The discharge hose should be kept as short as possible for more efficient operation.

Operation Concerns

1.Cavitation: This is the sudden formation and collapse of low-pressure vapor (bubbles) across the vanes of the impeller.

Cause: When the surface pressure on a liquid becomes low enough, the liquid will begin to boil (even at room temperature). With centrifugal pumps, cavitation can occur when the suction vacuum becomes too great, allowing water vapor or bubbles to form at the impeller. The rapid pressure increase can cause impeller damage.

Solution: Minimizing suction head and using the largest practical suction hose diameter will reduce the likelihood of cavitation. Do not use a suction hose with a diameter smaller than the Pump’s Intake Port (2″ diameter).

2.Water Hammer Pressure: This is energy sent back to the Pump due to sudden stoppage of water flowing from the Pump.

Cause: Water hammer pressure is more likely to occur when using a very long discharge hose. If the flow of water at the end of the discharge hose is shut off suddenly, energy is sent back to the pump. This causes a large pressure spike in the Pump housing, leading to potential damage to the Pump casing.

Solution: Use as short a discharge hose as possible and turn off water pump before closing water flow.

Item 68375	For Pump technical questions, please call 1-800-444-3353.	Page 7
	For Engine technical questions, please call 1-800-520-0882.

68375 specifications

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In summary, the Harbor Freight Tools 68375 is a well-rounded tool that excels in power, comfort, safety, and versatility. Its thoughtful design and robust features make it a preferred choice among both hobbyists and professionals. Whether for personal projects or professional commitments, the 68375 stands out as an essential tool that delivers consistent performance and reliability. This model exemplifies Harbor Freight's commitment to affordability without compromising on quality, making it a wise investment for anyone in need of a reliable addition to their toolbox.