proper protection, such as gloves, eye wear, and aprons ... · page 3 800-523-8499 proper...

800-523-8499www.dosatronusa.com

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

Step 3: Then, remove the hose.

Step 2: If there is still no suction, but the injector is clicking, turn the water on. Unscrew and remove the suction hose nut.

NOTE: To service your D8R you will need a strap wrench (Part #: TOOL01) and a seal pick (Part #:TOOL02).

Step 1: If your Injector is clicking, but not drawing the concentrate, it could be as simple as the strainer is plugged with debris. Take a look at the strainer. If it is clogged, clean it out and re-test your Dosatron.

D8R Troubleshooting - Part 1This D8R Troubleshooting will cover: The Injector is not drawing the concentrate, but is clicking.

Scan the QR code to watch our D8R - Troubleshooting video.

TOOL01 Strap wrench TOOL02 Seal Pick

8PJ008 Plunger seal assy

PJDI006 Check valve assy

8MP033 Piston shell8J026 Injection stem o-ring



Step 6: If you don’t see liquid moving up the tube or you don’t feel suction on your finger, turn the water off.

Step 5: If you feel suction, just cut a half inch off the top of the hose and reattach. You should see the liquid begin moving up the suction tube.

Step 4: Check to see if you feel suction on your finger.

D8R Troubleshooting - Part 1



Step 9: Unscrew to remove. Set the bell housing aside.

Step 8: Using the strap wrench, loosen the bell housing.

Step 7: Move the air bleed lever on the bell housing back and forth a few times to release the pressure.




Step 12: To change the plunger assembly (Part #: 8PJ008), hold the piston firmly and unscrew the plunger assembly.

Step 11: Take a close look at the plunger seal for nicks, scratches, or wear. If you see damage or don’t remember the last time you changed the seal, just replace the plunger assembly now.

Step 10: Grasp the white plastic bridge, pull the piston straight out of the body.




Step 14: Carefully insert the piston back into the body and press down until it stops.

Step 13: Thread the new plunger assembly onto the piston and hand tighten.


Step 15: Reinstall the bell housing, hand tight. Your Injector should now be drawing the concentrate.



Step 3: Unscrew the injection stem nut about four turns.

Step 2: Remove the suction hose and set aside.


If your Injector is pushing water down into the concentrate container, it’s time to investigate the check valve. Step 1: To do this, remove the hose nut.

This D8R Troubleshooting will cover: The Injector is pushing water down into your concentrate container, but is clicking.




Step 6: Pull the check valve assembly down and out of the stem.

Step 5: Now, unscrew and remove the check valve nut.

Step 4: Pull the injection stem assembly straight down.


Step 8: Then press down on the top of the cone shaft to release all of the check valve parts.

Step 9: Inspect all of the check valve assembly parts (Part #: PJDI006). If they are dirty, you may be able to soak, brush off, and reinstall. If you see damage or if you don’t remember the last time you changed these parts, just replace them now.



Step 7: If the upper portion sticks in the stem, push it out with something like a pen.


Step 11: Slide it into the valve guide.

Step 12: Next, hold the cone down and press the retainer into the guide.



Step 10: To reassemble the check valve, align the spring on the shaft of the cone.


Step 14: Now, press the check valve assembly into the stem as far as it will go. You may have to give it a twist.

Step 15: Thread the check valve nut onto the white stem assembly, hand tight.



Step 13: Then, set the seal with the raised center portion up, on the top of the barb and press it into the guide.


Step 17: Make sure the injection scale is aligned with the flow arrow on the body.

Step 18: Twist the assembly until it aligns with the threaded black sleeve. Then, make sure the black tabs align with the grooves in the threaded black sleeve.



Step 16: Press the injection stem assembly into the body.


Step 20: When properly installed, you will be able to see one thread showing between the stem and the body.

Step 21: Thread the suction hose nut onto the hose.



Step 19: Tighten the injection stem nut hand tight.




Step 22: Slide it onto the barb and hand tighten the nut. This should stop the water from dripping back into the concentrate tank.


Step 2: Unscrew to remove, set it aside.

Step 3: Grasp the white plastic bridge and pull the piston straight out of the body.



Step 1: Using a strap wrench, loosen the bell housing.

This D8R Troubleshooting will cover: The Injector is not clicking or stalling at low flow.


Step 5: You can visually inspect the upper and lower flanges on the piston shell. If they are worn or have deep scratches, the piston shell needs to be replaced.

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 4: Holding the piston, press the push rod up and pull it down. It should click in both directions. If not, please give us a call for assistance.


Step 9: Hand tighten the bell housing. The unit should now be clicking.



Step 7: To test the lower flange, insert the piston into the body. It should also be a snug fit. If either is loose, the piston shell needs to be replaced (Part #: 8MP033). For assistance in replacing the piston shell, please contact Dosatron technical service at (800) 523-8499.

Step 8: Insert the piston back into the blue body.

Scan the QR code to go to Dosatron’s YouTube Channel.

Scan the QR code to go to Dosatron’s video page.

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

proper protection, such as gloves, eye wear, and aprons ... · page 3 800-523-8499 proper...

Documents