General Maintenance
The A4 (Legacy) pump requires very little maintenance. However, the pump and all accessories should be checked weekly to ensure proper pump performance. This is especially important when pumping chemicals that may be extra corrosive. Inspect all components for signs of unusual wear, clogging, leaking, swelling, cracking, discoloration, or corrosion. Ensure rollers are moving freely and not straining or excessively wearing tubes. Replace worn or damaged components immediately.
Replacing Tubes and Rollers
The A4 (Legacy) pump is equipped with a Tube Failure Detection (TFD) that will sense a tube leak and stop the pump. This feature will prevent the pump from running when there is a tube leak.
When a tube leak occurs, or a tube needs to be replaced as part of periodic maintenance, the pump tube will need to be removed, and a new tube will need to be installed. This process is quick and should not take more than a few minutes. Follow the steps below or watch the video at the bottom of this section.
- Relieve system pressure. Disconnect the system plumbing from the pump tube adapters.
- Press the Start/Stop key to stop the pump.
- Remove the black thumb screws from the front of the pump head cover by unscrewing them counterclockwise.
- Remove the pump head cover by pulling it straight out.
- Once the font cover is removed, the pump will go into “Maintenance Mode”. In “Maintenance Mode” the pump will run at 6 rpm only.
- Twist the spider ring to allow for the individual rollers to be removed.
- Press Start and rotate the pump so one of the rollers is not in contact with the tube (this is the 9 o’clock position with a left-facing pump head.) Remove the roller. Repeat with other rollers.
- Once both rollers have been removed, the tube and roller assembly can easily be removed.
- Inspect pump head and thoroughly clean.
- Check all rollers to ensure they are moving freely. Replace rollers if worn or not rolling properly.
- After cleaning, push the rotor back on the shaft.
- Install a new tube, being careful not to pinch or twist the tube.
- Rotate the roller assembly to the open position and reinstall each of the rollers. Be sure pinch rollers are installed on opposite ends of the roller assembly.
- Press Start to rotate the pump and ensure the tube and roller rotate properly.
- Retighten Spider ring.
- Place the clear cover onto the pump head. Secure the cover with the provided thumb screws.
- The pump screen will ask if the tube has been replaced. Answer “Yes”. Check the next screen to verify the tubing information. (If you have switched to a different style tube, you will want to change the tube information on this screen. Press “Save.” The pump is now ready for operation.
For more information on pump maintenance and tube replacement, please watch the video below, or refer to the product manual.
A4 (Legacy) Tube Replacement and Maintenance Video.
FAQs
Frequently Asked Questions
A4 (Legacy) Maintenance
- How many years can I expect my pump to last?
The A3, A4, M3, and M4 model chemical metering pumps are designed for many years of service. The motors and electronic circuitry have a design life expectancy of a minimum of 10 years when properly installed and maintained. These pumps are fully repairable and serviceable. Depending on the model number, the pumps are warranted for a minimum of 2 years and up to 5 years. It is not uncommon for these pump to last up to 25 years with proper care and maintenance.
