6.
Loosen the dosing head (2) and the backplate (5) from the pump
housing - but only loosen!
7.
Hold the pump housing with one hand and clamp the diaphragm (4)
with the other hand between the dosing head (2) and the backplate
(5).
8.
Loosen the diaphragm (4) from the drive axle with a gentle back‐
wards turn of the dosing head (2), diaphragm (4) and backplate (5)
in an anticlockwise direction. (Possibly hold the slide rod (6) using
an appropriate wrench through the opening for the plug (9).)
9.
Unscrew the diaphragm (4) completely from the drive axle.
10.
Clean the sealing surfaces.
11.
Place the diaphragm (4) into the backplate (4).
12.
Position the dosing head (2) so that the suction connector (1) lies
above the leakage hole of the backplate (5).
13.
Insert the screws and manually tighten the diaphragm in a clockwise
direction up to the slide rod (6).
14.
Switch the pump on.
15.
Set the stroke length to 100%.
16.
Place the dosing head (2) with the screws onto the diaphragm (4)
and the backplate (5) - the suction connector must be pointing
downwards in the pump's subsequent fitting position.
17.
When the pump is running, rotate the liquid end as far to the right
until the suction connection (1) is pointing vertically downwards.
18.
Now disconnect the pump from the power supply so that the slide
rod (6) comes to a standstill approximately at the rear end position.
19.
Gently tighten the screws (1) and then tighten them diagonally. See
below for the tightening torque.
20.
With PP types with bleed valve: Allow the cover of the liquid end to
rest in the dosing head, then press the grip on the bleed valve into
the dosing head.
CAUTION!
Leakage possible
–
Check the tightening torque of the screws
after 24 hours of operation!
–
With PP dosing heads, recheck the tightening
torque again after three months!
Data
Value Unit
Tightening torque for screws:
4.5 ... 5.0 Nm
Tightening torque
Carrying out repairs
11