QP-402H — MAINTENANCE (PUMP)

Pump Vacuum Test

CAUTION - Pump Priming

DO NOT attempt to start the engine unless the pump has previously been primed with water. Severe pump damage will occur if pump has not been primed.

To perform the pump vacuum test do the following:

1.Remove the pump fill cap (Figure 2), and fill the pump with water.

2.Start the engine as outlined in the initial start-up section, and wait for the pump to begin pumping.

3.As shown in Figure 18 (next page), place a water hose inside the discharge opening of the pump, and turn on the water. This flow of water into the discharge opening will prevent the pump from running dry.

4.Place the Pump Vacuum Tester (P/N 7000030) over the pump suction (inlet) opening (Figure 17) with the vacuum gauge facing upwards. It may be necessary to apply a small amount of water around the rubber seal of the vacuum tester to make a good suction fit.

5.Check and make sure that there are no air leaks between the vacuum tester and the inlet port on the pump. If air leaks are present reset vacuum tester.

6.Run the pump for a few minutes while monitoring the vacuum gauge. If the gauge indicates a reading between -25 and -20 in. Hg. (inches of mercury) then it can be assumed that the pump is working correctly.

 

25 in. Hg (inches of mercury)

NOTE

translates into 25 feet of lift at sea

 

level.

7.If the vacuum tester gauge indicates a reading below -20 in. Hg, it can then be assumed that the pump is not functioning correctly, and corrective action needs to be taken.

8.To test the flapper valve, shut down the engine. The vacuum tester should remain attached to the pump suction inlet port by vacuum. This indicates the pump's flapper valve is seating properly to hold water in the suction hose when the engine is stopped.This prevents backflow and allows for faster priming when the engine is restarted.

PAGE 20 — QP-402H CENTRIFUGAL PUMP — OPERATION AND PARTS MANUAL — REV. #1 (04/02/08)

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Multiquip qp-402h manual QP-402H Maintenance Pump, Pump Vacuum Test

qp-402h specifications

The Multiquip QP-402H is a powerful, versatile piece of construction equipment designed for a range of applications, particularly in the construction and operational sectors. Known for its durability and efficiency, the QP-402H is a part of Multiquip’s extensive portfolio of equipment that adheres to the high standards of reliability and performance.

One of the standout features of the QP-402H is its robust Honda GX160 engine, which delivers superior power and performance. The engine is designed for optimal fuel efficiency, allowing operators to maximize their productivity while minimizing operational costs. This machine is engineered to handle a wide variety of tasks, from producing high-quality concrete to powering various construction tools, making it an invaluable asset on job sites.

In terms of design, the QP-402H features a heavy-duty construction, which ensures its longevity even under strenuous working conditions. The unit is equipped with an advanced compressor system that provides consistent air supply for up to four pneumatic tools simultaneously. This multi-tool capability significantly enhances productivity on the job site, allowing crews to work more efficiently without having to wait for equipment to become available.

The QP-402H incorporates sophisticated technologies to ensure user-friendly operation. Its intuitive controls are designed to be easily accessible, enabling operators to quickly adjust settings and manage functions with minimal effort. Additionally, the compact design of the unit allows for easy transportation and maneuverability, making it a suitable choice for both large scale and tight-space projects.

Another notable characteristic of the QP-402H is its low noise level, which is increasingly important in urban environments where noise regulations are strict. This quiet operation ensures that tasks can be completed with minimal disruption, promoting better relations with surrounding communities.

Safety is a primary consideration in the design of the Multiquip QP-402H. The machine is equipped with various safety features, including a protective cage for the engine and secure fastenings for operational stability. These features contribute to a safer working environment for operators and personnel on-site.

In conclusion, the Multiquip QP-402H stands out as a reliable, efficient, and versatile solution in the realm of construction equipment. Its powerful engine, user-friendly technologies, robust construction, and safety features make it an ideal choice for professionals who require high-performance equipment that can handle varied demands in challenging environments.