Unger HCD25 - Manual (Page 7)

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Quick Start Guide
2. Changing the seals
When the proportioning pump starts to “stut-
ter”, or doesn’t operate at all in low flow rates, it
is time to change the piston seals.
When the proportioning pump stops sucking
supplements, or starts doing so irregularly, it is
time to change the suction seal.
1. Release and take off the cover (9) by anticlock-
wise turning it with your hands.
2. Pull out the piston body (2) and take it out of
the body (31), pulling it carefully upwards.
3. Use a pair of pliers to grasp the rim of the
upper piston seal (41), pull firmly and remove
the seal from the piston body.
4. Use a pair of pliers to grasp the rim of the
lower piston seal (42), pull firmly and remove
the seal from the piston body.
Beware: not to damage the piston body with
the pliers.
ENGLISH