Maintenance
Tighten up dosing head bolts
42
© Lutz-Jesco GmbH 2015
BA-10221-02-V03
Stepper Motor-driven Diaphragm Dosing Pump
MAGDOS LK
Operating Instructions
Maintenance work to be carried
out
Frequency
Replace parts that are subject to
wear (diaphragms, valves, seals,
etc.)
if you detect unacceptable wear
Rinse out and clean the dosing
pump
n
before changing diaphragms
n
before decommissioning for
a long period of time
n
after feeding aggressive,
adhesive, crystallising or
contaminated liquids
Tab. 39: Maintenance information and maintenance intervals
12.2 Tighten up dosing head bolts
è
Tighten the dosing head bolts in diagonally opposite sequence with a
torque wrench.
The necessary torque is 180 Ncm.
12.3 Change the diaphragm
d
e
c
b
a
Fig. 51: Exploded view of the diaphragm and dosing head
12.3.1 Dismount the old diaphragm
Precondition for action:
ü
You have disconnected the dosing pump from the mains supply.
ü
You have depressurised the hydraulic sections of the plant.
ü
You have rinsed the dosing pump using a safe medium (e.g. water).
Perform the following working steps:
1.
Screw out the four screws
e
on the dosing head using a suitable
tool (SW 3 Allen key) and take off the dosing head
d
.
2.
Use pliers to bend the edge of the diaphragm
c
slightly upwards
and screw it out counter-clockwise.
12.3.2 Install a new diaphragm
Precondition for action:
ü
You have thoroughly cleaned the diaphragm rod
b
and the
diaphragm flange
a
so that the new diaphragm is not affected by
dosing medium residues.
ü
You have slightly greased the diaphragm thread
c
(e.g. using
Molykote Longterm W2).
1.
Screw the diaphragm manually
c
in the clockwise direction until it
safely contacts into the diaphragm rod.
2.
Bring the dosing head into position and insert the screws. First
tighten the screws finger-tight. After this, tighten the screws in diago-
nally opposite sequence, e.g. top left and bottom right and top tight
and bottom left.
NOTICE
Damage to the dosing head/leakiness of the diaphragm
If you tighten the screws too much, this can lead to the dosing head
being damaged. However, not tightening the screws enough leads to
the diaphragm being leaky and correct functioning being affected.
ð
Tighten the screws to a torque of 180 Ncm.
ü
Diaphragm change finished.
i
It may be necessary to recalibrate the dosing pump after
replacing the diaphragm or other spare parts on it. For more
information, refer to page 35.
12.4 Clean suction and discharge valves
Contaminated valves affect the dosing preceision and this means that
you should clean the valves on a regular basis.
With dosing heads made of plastic, when replacing a valve you must
replace the complete dosing head (see “Spare parts“ on page 44).
Summary of Contents for MAGDOS LK
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