dosatron D14MZ3000AFII User manual

800-523-8499 • 727-443-5404
Extend the Life of Your Dosatron
REBUILD KIT
D14MZ3000AFII
Part #: MKD14MZ3000AF
Kit includes:
Part 1: Piston Kit
Upper ange
Lower ange
Omega spring
Connecting rod
Push rod seal
Part 2: Seal Kit
Injection sleeve o-ring
Injection stem o-ring
Check valve assembly
Plunger with seal

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This kit is for the Dosatron D14MZ3000AFII and consists of two parts:
Congratulations on purchasing your
Dosatron Rebuild Kit.
Part #: MKD14MZ3000AF
Part 1 - Piston Kit Contents:
PDI651 - Omega Spring
PDI649 - Connecting Rod
PDI648 - Push Rod Seal
PDI643 - Upper Flange
PDI644 - Lower Flange
• Part 1 - Piston Kit
Part 2 - Seal Kit Contents:
PJDI140 - Check Valve Assembly
JDI120 - Injection Stem O-Ring
JDI100 - Injection Sleeve O-Ring
PJDI138 - Plunger With Seal
• Part 2 - Seal Kit
Remember to wear proper protection when performing maintenance
such as gloves, eyewear, and apron.

800-523-8499 • 727-443-5404
MKD14MZ3000AF
Part 1: Piston Kit Instructions
Begin by removing the piston
from your Dosatron injector.
Unscrew and remove the bell
housing (you may use a
universal strap wrench), pulling
the piston out of the body. Set
the bell housing and body aside.
Position needle nose pliers
near the top of the plunger,
and carefully twist the plunger
counter clockwise to remove.
In order to remove the top or
larger diameter ange, locate the
small notch inside the black
piston shell. This is where a
tooth, on the inside of the
ange, locks it into place.
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You will need to apply pressure
to the ange on either side of
the notch as you twist the ange
counter clockwise. It may be
a snug t. Lift to remove and
discard.
Flip the piston upside down
and follow steps 3 and 4 to
remove the lower or smaller
diameter ange.
To remove the motor and valve
support assembly from the
piston shell, you will need a
at head screwdriver. Using
the screwdriver, remove the
upper valves from the guide.
The valves look like golf tees
and will drop down and out of
the piston shell. Set them aside.
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Grasp the top of the white plastic
parts of the mechanism and lift
straight up.
You now have two
subassemblies – the push rod
on the left and the valve support
frame on the right.
In order to disassemble the push
rod, remove the connecting rod
off the Omega spring.
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Twist to remove the Omega
spring out of the push rod.
Install the new Omega Spring
(Part #: PDI651) by carefully
pushing the Omega spring into
the push rod.
Slide the other end of the Omega
spring into the new Connecting
Rod (Part #: PDI649). The key
to this step is to make sure the
curved top of the push rod faces
in the same direction as the
Omega spring.
Replace the Push Rod Seal
(Part #: PDI648). Remove by
grasping and turning counter
clockwise. Carefully slide the
new push rod seal onto the
push rod as far as it will go and
twist a quarter turn clockwise
to lock.
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4

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Install the new Upper Flange
(Part #: PDI643) by locating the
small tooth on the inner diameter
of the ange.
Now locate the notch on the
piston shell.
Be careful not to install the
ange upside down.
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Align the tooth with the shell and
press down and twist a quarter
turn clockwise to lock. If it is
difcult to twist or if the ange
lifts up easily, just remove the
ange, realign and try again.
Install the new Lower Flange
(Part #: PDI644) the same way.
Before reinstalling the push rod
and valve support assembly, look
inside the piston shell. You will
notice four holes in a line and a
single hole on the other side.
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800-523-8499 • 727-443-5404
Notice how the valve support
frame aligns on the side with the
four holes, making sure it goes
into the grooves.
To demonstrate the alignment
of the push rod assembly, the
curved top would face inward,
inserting the push rod into the
single hole. This is where
the connecting rod sits in
the piston.
The key is to make sure the
white connecting rod drops into
the notches inside the
piston shell.
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Now to insert both the valve
support frame and the push rod
into the piston shell, use your
index nger to push on the
spring. This will set everything
into place and you will hear
a click. If the parts aren’t
tting together, just lift both
subassemblies out and try again.
Insert the upper valves into the
bottom of the upper area,
snapping them into the valve
support frame.
To test the piston pull the push
rod up and press it down a few
times. It should click in both
directions.
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For video instructions go to: http://www.dosatronusa.com/d14mz3000/
and view the D14MZ3000 Troubleshooting Video and the D14MZ3000
Piston Video or scan the QR codes with your smart phone.
D14MZ3000
Piston Video
D14MZ3000
Troubleshooting Video
8
Click on QR code to view video.

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MKD14MZ3000AF
Part 2: Seal Kit Instructions
PJDI139
Unscrew the suction hose nut
and remove the suction hose.
Unscrew the injection stem nut.
Pull the injection stem straight
out from the body of the injector.
Set the nut and body aside.
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Unscrew and remove the check
valve nut.
Grab the barb and pull the
check valve assembly straight
out. It usually comes out in two
pieces. Discard all check valve
parts.
Unscrew and remove the
lock nut.
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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 sleeve.
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Remove and replace the
Injection Stem O-Ring
(Part #: JDI120).
Remove and replace the
Injection Sleeve O-Ring
(Part #: JDI100).
Align the groove in the white
stem with the tooth inside the
lower portion of the black sleeve.
Sliding the stem down in, as far
as possible.
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Thread the adjusting nut back
onto the black 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.
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Reinstall the check valve nut.
Reinstall the Plunger with
Seal (Part #: PJDI138) into the
bottom of the piston shell.
Using the needle nose pliers
twist the plunger a quarter
turn clockwise to lock.
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Install the new Check Valve
Assembly (Part #: PJDI140)
into the stem. Make sure it is
in the position shown before
inserting into the stem.

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Carefully press the piston back
into the injector and install the
bell housing.
To nish up, carefully insert
the plunger into injection
stem assembly.
NOTE: Be extremely careful
not to bend the plunger
when reassembling.
Align the notches in the lower
part of the blue body with the
teeth on the top of the injection
stem assembly. Make sure the
scale of your preference is
facing out.
If the scale you prefer is not
facing out, loosen the stem nut
and remove. Pull the stem down
slightly, rotate 180 degrees and
push it back up.
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Reinstall the nut hand tight.
Reposition the ferrule as shown.
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Before installing the suction
hose, slide the ferrule back onto
the hose. Cut a half inch off the
top of the hose.

800-523-8499 • 727-443-5404
Insert the hose onto the barb.
Hand tighten the hose nut.
After you tighten the nut, pull
on the hose to make sure it is
connected securely.
If the hose comes off easily,
cut another half inch off and
reattach.
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For video instructions go to:
https://www.youtube.com/user/DosatronIntl
and view the D14MZ3000 Seal Kit Video or
scan the QR code with your smart phone.
D14MZ3000
Seal Kit Video
Click on QR code
to view video.

CHAT at www.dosatronusa.com
2090 Sunnydale Blvd. • Clearwater, FL 33765
800-523-8499 • www.dosatronusa.com