Maintenance
Change the diaphragm
47
© Lutz-Jesco GmbH 2014
Subject to technical changes.
140725
BA-10103-02-V01
Stepper Motor-driven Diaphragm Dosing Pump
MEMDOS SMART LK
Operating instructions
Maintenance work to be carried out
Frequency
Replace parts that are subject to wear
(diaphragms, valves, seals, etc.)
When unacceptable levels of
wear are detected
Rinse out and clean the dosing pump
Before changing dia-
phragms
Before taking out of service
for a long period of time
After feeding aggressive,
sticky, crystallising or
contaminated liquids
Tab. 41: Maintenance information and maintenance intervals
12.2 Tighten up dosing head bolts
Tighten the dosing head bolts in diagonally opposite sequence with a
torque wrench.
The necessary torque is 180 Ncm.
12.3 Change the diaphragm
The dosing pump MEMDOS SMART LK has an automatic diaphragm
change program which simplifi es replacing diaphragms.
햵
햶
햴
햳
햲
Fig. 53: Exploded view of the diaphragm and dosing head
12.3.1 Remove the old diaphragm
Precondition for action:
You have depressurised the hydraulic sections of the plant.
You have rinsed the dosing pump using a safe medium (e.g. water).
Perform the following working steps:
1.
Screw out the four screws
햶
on the dosing head using a suitable
tool (SW 3 Allen key) and take off the dosing head
햵
.
2.
Press
Menu
.
3.
Use the or key to choose the
Diaphragm change
menu item
and press OK.
The dosing pump displays menu 9
Diaphragm change
.
Change diaphragm
Press start !
Menu
9
Start
Fig. 54: Menu 9 Diaphragm change
4.
Press
Start
.
The diaphragm travels to the front end position. The message
"Please wait!" is displayed.
Change diaphragm
Please wait !
Menu
9
Start
Wait until the message "Change!" is displayed.
5.
Change diaphragm
Replace !
Menu
9
Use pliers to bend the edge of the diaphragm
햴
slightly upwards
and screw it out counter-clockwise.
12.3.2 Install a new diaphragm
Precondition for action:
You have thoroughly cleaned the diaphragm rod
햳
and the
diaphragm fl ange
햲
so that the new diaphragm is not affected by
dosing medium residues.
You have slightly greased the diaphragm thread
햴
(e.g. using
Molykote Longterm W2).
1.
Screw the diaphragm manually
햴
in the clockwise direction until it
safely contacts into the diaphragm rod.
2.
Press
Menu
.
The diaphragm travels to the rear end position.
3.
Bring the dosing head into position and insert the screws. First
tighten the screws fi nger-tight. After this, tighten the bolts on the
diagonal, e.g. top left – bottom right – top right – bottom left.
NOTICE
Damage to the dosing head/diaphragm leaks
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.
Tighten the screws to a torque of 180 Ncm.
Diaphragm change fi nished.
