dosatron D25+ Series, Owner'S Manual, Page: 14 / 22

©
DOSATRON INTERNATIONAL S.A.S / 27
©
DOSATRON INTERNATIONAL S.A.S / 28
EN
CHANGING THE DOSING PART SEALS
Frequency: At least, once per year.
Contact DOSATRON, or one of its distributors, for seal kits adapted to your
dosing pump.
For dismantling the dosing part, follow the instructions in the § DISMANTLING/
REFITTING THE DOSING PART.
IMPORTANT! Do not use tools or metal utensils.
Replacing dosing piston seal (Fig. 20) :
- Between finger and thumb, pinch the
component and the seal; push towards the
other side to distort the seal. (Use a dry cloth
to prevent the seal from slipping between your
fingers)
- Increase the distortion to grip the part of the
seal which overlaps and then pull it out of its
groove.
- Clean the seal groove without any tools. (use
water and a cloth)
- Refitting is done by hand. It is very important
that the seal is not twisted once in place as
this would impair its watertightness.
Change the O-ring of the dosing body:
-Use the method explained below:
Change the suction valve:
- Unscrew the suction valve retaining ring
- Remove the suction valve by pulling it in the
axis of the dosing part.
DRAINING THE DOSATRON
For complete maintenance of the DOSATRON, or to protect it from frost,
draining may be necessary.
- Close the water inlet and reduce the pressure to zero by opening the fast
priming valve situated downstream of the Dosatron.
- Remove the dosing part (§ DISMANTLING/REFITTING THE DOSING
PART).
- Remove the top cap and the motor.
- Disconnect the connectors at the DOSATRON inlet and outlet.
- Empty the pump body after having removed it from the mounting bracket.
- Refit, having first cleaned the motor top cap seal.
Fig. 20
DISMANTLING/REFITTING THE DOSING PART
Before performing any maintenance on the DOSATRON, it is essential to refer
to the § PRECAUTIONS. Before dismantling, and to avoid any contact with the
products dosed, operate the DOSATRON by aspirating clear water to rinse the
dosing pump.
- Turn off the water supply and let the pressure
drop to zero.
- Remove the suction hose (see § DISMANTLING
THE SUCTION HOSE)
- Lift the quick coupling ring (patented system)
and unlock the dosing part by unscrewing the
ring up to the mechanical stop (approx. 1/8
th
of a turn) (Fig.17 )
- Pull downwards to remove the dosing part.
- Before refitting, position the dosing part
according to the desired scale (percentage
or ratio).
- Insert the dosing body into the pump body
taking care to align the aligning pins correctly
(Fig. 18) . If needed, to see the pins properly,
unscrew the dosing adjustment sleeve to
reach the value of 3% or 1/33.
- Push the quick coupling ring up towards the
pump body and lock in place by tightening
the ring until it clicks (approx. 1/8
th
of a turn)
(Fig. 19)
Fig. 17
Fig. 18 Fig. 19
š
Suction
valve
Suction
valve
nut
Suction hose
nut
Eyelet