dosatron D 25 F 1 Assembly instructions

Page 1
800-523-8499
www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 3: Then, use the strap wrench (Part #: TOOL01) to loosen
the lid.
Step 2: Remove suction hose.
NOTE: To service your D25F Medicator you will need the
plunger and check valve seals, check valve assembly and a strap
wrench.
Step 1: To begin, unscrew the suction hose nut.
D25F Service
Before we start make sure the medicator is clicking. If not, be sure to watch the
D25F Troubleshooting video.
Scan the QR
code to watch
our D25F -
Service video.

Page 2
800-523-8499
www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 6: To change the plunger seal (Part #: J009), hold the piston
rmly. Pinch and roll the seal off of the plunger.
Step 5: Grasp the white valve support and pull the piston straight
up and out of the body. Set the body aside.
Step 4: Unscrew and remove it.
D25F Service

Page 3
800-523-8499
www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 9: Also, press the push rod down and look at the two actua-
tor springs on the bottom. If you see anything dirty or broken, it
needs to be cleaned or replaced.
Step 8: While you have the piston out, do a visual inspection on
the white valve support on top.
Step 7: Install the new seal into the groove on the plunger.
D25F Service

Page 4
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www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 12: Unscrew and remove the check valve barb
(Part #: P169).
Step 11: Re-install the lid hand tight.
Step 10: Carefully insert the piston into the body and press down
until it stops.
D25F Service

Page 5
800-523-8499
www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 15: Now, press the new check valve assembly into the stem
as far as it will go.
Step 14: Then carefully pry the check valve assembly
(Part #: MPDI122), down and out of the stem. A small at blade
screwdriver or pick will make it easier. Discard the old check valve
seal and assembly.
Step 13: Remove the check valve seal (Part #: J051).
D25F Service

Page 6
800-523-8499
www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 18: Before installing the suction hose, inspect it. If it ares
out, cut an inch or so off and reinstall. Or, if the suction hose is
cracked, rigid, or looks really old, just replace it.
Step 17: Thread it onto the white stem and hand tighten.
Step 16: Place the new check valve seal with the groove facing
upward into the new barb.
D25F Service

Page 7
800-523-8499
www.dosatronusa.com
Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
D25F Service
Step 21: Hand tighten the nut.
Step 20: Slide it onto the barb.
Step 19: Now, thread the suction hose nut onto the hose.
Note: To watch the video go to Dosatron’s video page
www.dosatronusa.com/videos.aspx or YouTube Channel
www.youtube.com/user/DosatronIntl