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Summary of Contents for dosatron MKD40MZ5AF
- Page 1 Extend the Life of Your Dosatron Rebuild Kit D40MZ5...
- Page 2 Dosatron D40MZ5 Rebuild Kit Part #: MKD40MZ5AF • MKD40MZ5K • MKD40MZ5VF This kit is for the Dosatron D40MZ5 and consists of two parts: • Part 1 - Piston Kit • Part 2 - Seal Kit Part 1 - Piston Kit Contents:...
- Page 3 D40MZ5 Part 1 - Piston Kit Instructions Unscrew and remove the bell housing, you may use a universal strap wrench. Pull the piston out of the body and set the bell housing and body aside. Remove the plunger from the piston by rotating it a quarter of a turn counterclockwise.
- Page 4 PUSH ROD Raise the push rod carefully and pull the piston's mechanism up and out of black piston shell. It will probably come out in PUSH ROD VALVE GUIDE either two or three pieces. The first is the valve guide and the others are the push rod, Omega Spring and Connecting Rod.
- Page 5 CHANGING THE PUSH ROD SEAL, OMEGA SPRING AND CONNECTING ROD: Locate the Push Rod Seal and twist it a quarter turn counterclockwise and slide down and off the push rod. Slide the NEW Push Rod Seal (PDI1085) onto the push rod with the tapered end on the push rod.
- Page 6 Snap the other end of the Omega Springs into the push rod as shown. Set the parts aside and pick up the piston assembly. TO CHANGE THE PISTON FLANGES: UPPER FLANGE On the Upper Flange, locate the white tooth on the inside of the lock ring.
- Page 7 Rotate the white lock ring about ¾ of an inch counterclockwise to unlock, making sure the white tooth slides above the black lever. Slide the white lock ring and Upper Flange up and off the black piston shell. Pick up the NEW Upper Flange (PDI1093) and slide it onto the piston shell with the V shape opening facing downward, and...
- Page 8 Hold the white lock ring with the flat edge facing down towards the piston, and place the lock ring on top of the NEW Upper Flange. The tabs on the inside of the lock ring should align with the gaps around the edge of the piston shell;...
- Page 9 Press down on the lock lever directly next to the tooth. Rotate the lock ring about ½ of an inch clockwise to unlock, making sure the white tooth slides on top of the lever. Slide the lock ring and Lower Flange up and off the black piston shell.
- Page 10 Pick up the NEW Lower Flange (PDI1092) and slide it onto the piston shell, with the V shape opening facing downward and flat edge facing up. Push down until it sits on the edge of the black piston shell. Hold the white lock ring with the flat edge facing down towards the piston, and place the lock ring on top of the NEW Lower Flange.
- Page 11 TO ASSEMBLE THE INSIDE OF THE PISTON Inside the piston shell are 8 holes the same size, 4 for the lower valves (center holes) and 4 for the upper valves (top holes). There is also a single smaller hole for the push rod assembly. Insert the push rod assembly inside the smaller hole with the top curved portion facing...
- Page 12 Make sure the Connecting Rod drops into the notches inside the piston shell. Align the valve rack next to the push rod assembly making sure PUSH ROD the guide aligns with the black ASSEMBLY VALVE GUIDE posts on the piston shell, and the lower valves align with the 4 center openings.
- Page 13 Snap one of the upper valves into the valve guide. Now, test the piston assembly by carefully pulling the push rod up until you hear a click, then snap the last 3 valves back on. Insert the plunger back into the piston and rotate it a quarter of a turn clockwise to lock it into place.
- Page 14 Insert the piston back into the Dosatron injector and screw the bell housing back on. You have completed the steps to replace the Piston Flange Kit on your D40 Dosatron injector. Continue with Part 2 - Seal Kit instructions. If you have any questions, call 1-800-523-8499 or to CHAT visit www.dosatronusa.com.
- Page 15 D40MZ5 Part 2 - Seal Kit Instructions Disconnect the suction hose by unscrewing the hose clamp and remove the suction hose. Set both aside. Unscrew the injection stem nut, slide it down and set aside. Pull the injection stem straight down from the body of the injector.
- Page 16 Unscrew and remove the check valve nut. Grab the barb and pull the check valve assembly straight out and discard. Unscrew and remove the lock nut. CHAT at www.dosatronusa.com...
- Page 17 Remove the C clamp by spreading the opening and sliding it down over the threads. Unscrew and remove the adjusting nut. Push the white injection stem up and out of the black injection sleeve. 1-800-523-8499 • 1-727-443-5404...
- Page 18 Remove and replace the Injection Sleeve O-Ring (Part #: JDI100). Remove and replace the Injection Stem O-Ring (Part #: JDI122). Align the groove in the white stem with the tooth inside the lower portion of the black sleeve. Slide the stem down as far as possible.
- Page 19 Thread the adjusting nut back onto the black injection sleeve. Replace the C clamp by sliding it over the threads. Rotate until it clicks into place. Thread on the lock nut and hand tighten. 1-800-523-8499 • 1-727-443-5404...
- Page 20 Install the new Check Valve Assembly (Part #: PJDI118V) into the stem. Reinstall the check valve nut. Set the stem aside and pick up the blue body. Remove the Plunger Seal using a small flat blade screwdriver. Install the NEW Plunger Seal (Part #: JDI123) into the groove of the plunger.
- Page 21 Align the notches in the lower part of the blue body with the teeth on the top of the injection stem assembly. Reinstall the nut hand tight. If the scale you prefer is not facing out, just loosen the stem nut and remove. Pull the stem down slightly, rotate 180 degrees, push it back up, and reinstall the nut...
- Page 22 Slide the hose onto the barb and tighten the clamp. NOTE: Make sure to set your Dosatron unit to the desired setting If you have any questions, call 1-800-523-8499 or to CHAT visit www.dosatronusa.com. CHAT at www.dosatronusa.com...
- Page 23 1-800-523-8499 • 1-727-443-5404...
- Page 24 2090 Sunnydale Blvd. • Clearwater, FL 33765 1-800-523-8499 • www.dosatronusa.com...
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