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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.

Step 3: Slide the ferrule back.

Step 2: If there is still no suction, unscrew the suction hose nut and remove the suction hose.

NOTE: To troubleshoot your Dosatron D14MZ3000, you will need a pair of needle nose pliers and a strap wrench.

Step 1: Take a look at the strainer. If it’s clogged, just clean it and re-test your Dosatron unit.

D14MZ3000 Troubleshooting - Part 1This D14MZ3000 - 14 GPM Troubleshooting Part 1 will cover: The injector is clicking, but not drawing the concentrate.

Scan the QR code to watch our D14MZ3000 - Troubleshooting video.



Step 6: Then, insert the hose into the barb, and hand-tighten the nut. By the way, if the hose is cracked, rigid, or looks really old just replace it now.

Step 5: Reposition the ferrule.

Step 4: Cut a half inch off the top of the hose.

D14MZ3000 Troubleshooting - Part 1



Step 8: Press the air bleed button of the bell housing a few times to release the pressure.

Step 7: After you have reinstalled the suction hose, you should start to see the liquid begin moving up the hose. If the liquid isn’t moving up the hose after a minute or so, turn the water off.


Step 9: Unscrew the suction hose nut, remove hose and set aside.



Step 11: Then, pull the injection stem straight out from the body of the injector and set aside.


Step 10: Unscrew the injection stem nut and remove.

Step 12: Take a close look at the plunger rod and seal.

NOTE: Make sure the rod is straight and that the seal is free of nicks, scratches or wear. If the plunger or seal is damaged or you don’t remember the last time you changed it, just replace it now.



Step 13: To change the plunger assembly (Part #: PJDI138), grasp the white plunger rod and pull it down as far as it will go.


Step 14: Position the needle nose pliers near the top of the plunger.

Step 15: Then, quickly and carefully twist the plunger counter clockwise and remove.




Step 16: To install the new plunger assembly (Part #: PJDI138), align the top of the plunger with the retainer.

Step 18: To finish up, carefully slide the injection stem assembly onto the plunger.

Step 17: Then, use the needle nose pliers and twist it a quarter turn clockwise to lock.




Step 19: Align the notches in the lower part of the blue body with the two teeth on the top of the injection stem assembly.

Step 21: Now, slide the hose into the barb and hand-tighten the nut.

Step 20: Then, thread on the injection stem nut, hand tight.




Step 22: To make sure the hose is connected securely, give it a pull. If it comes off easily, you may need to cut a half inch off the top of the hose, reset the ferrule and reattach the hose nut. Slowly turn the water on and it should begin drawing the concentrate.



Step 3: Grasp the white threaded barb and pull the check valve assembly straight out.

Step 2: Unscrew and remove the check valve nut.

Step 1: Remove the hose nut and hose and set aside.

D14MZ3000 Troubleshooting - Part 2This D14MZ3000 -14 GPM Troubleshooting Part 2 will cover: The injector is clicking, but water is going down into the tank.



Step 6: Then, carefully lift the retainer from the seal. You are checking to see if there is anything lodged or stuck.

NOTE: To inspect the check valve, carefully lift the cone from the retainer.

Step 5: Look at the bottom side of the cone.

Step 4: It usually comes out in two pieces. Set the unit aside.




Step 8: To re-assemble, place the new check valve assembly (Part #: PJDI140) into the top of the barb.

Step 7: Don’t try to remove the spring but if it is deformed or stretched, the complete check valve assembly needs to be replaced. If you don’t remember the last time you changed these parts, just replace them now.


Step 9: Then, press it into the stem as shown.




Step 10: Reinstall the check valve nut, hand tight.

Step 11: Now, slide the hose into the barb.

Step 12: Hand tight the nut.




Step 13: To make sure the hose is connected securely, give it a pull. If it comes off easily, you may need to cut a half inch off the hose, reset the ferrule and reattach the hose nut.




Step 3: Then, unscrew, remove and set aside.

Step 2: Use the strap wrench (Part #: TOOL01) to loosen the bell housing.

Step 1: Turn the water off and press the air bleed button on the top of the bell housing a few times to release the pressure.

This D14MZ3000 - 14 GPM Troubleshooting Part 3 will cover: If the injector isn’t clicking.




Step 6: Another way to check the flanges is by doing a fit test. To test the upper flange, invert the piston and insert it into the blue bell housing. It should fit snugly.

Step 5: Visually inspect the upper and lower flanges on thepiston shell. If they are worn or have scratches, the flanges need to be replaced.

Step 4: Grasp the piston and pull it straight out.




Step 7: To test the lower flange, position the needle nose pliers near the top of the plunger.

Step 8: Then, twist it a quarter turn counter clockwise to remove.

Step 9: Insert the piston into the body. It too should be a snug fit. If either is loose, the flanges need to be replaced.




Step 12: Install the new upper flange, align the tooth inside the flange with the notch in the piston shell.

Step 11: Remove by lifting straight up.

Step 10: To replace the upper flange (Part #: PDI643), grasp and twist it counter clockwise.




Step 13: Press it down into place and twist clockwise until it locks.

Step 14: To replace the lower flange (Part #: PDI644), grasp and twist it counter clockwise.

Step 15: Remove by lifting straight up.




Step 17: Press it down into place.

Step 16: To install the new lower flange, align the tooth inside the flange with the notch in the piston shell.

Step 18: Twist clockwise until it locks.



Step 20: Use the needle nose pliers and twist it a quarter turn clockwise to lock.

Step 19: Reinstall the plunger by aligning the top with the retainer.


Step 21: Carefully slide the piston back into the body.



Step 22: Reinstall the blue bell housing, hand tight.


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To learn more, scan the QR codes below for more information.

Proper protection, such as gloves, eye wear, and aprons ...€¦ · Proper protection, such as...

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