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8. Service
In order to ensure a long service life and dosing
accuracy, wearing parts such as diaphragms and
valves must be regularly checked for signs of wear.
Where necessary, replace worn parts with original
spare parts made from suitable materials.
Should you have any questions, please contact your
service partner.
8.1 Regular maintenance
Interval
Task
Check, if liquid leaks from the drain
opening (see section Installation of
pump) and if the drain opening is
blocked or soiled.
If so, follow the instructions given in
section Diaphragm leakage.
Check, if liquid leaks from the dosing
head or valves.
Daily
If the pump was operated with
damaged or loose dosing head
screws, immediately separate the
pump from the power supply! Follow
the instructions given in section
Operation with loose dosing head
screws.
If necessary, tighten valves and cap
nuts, or perform service.
Clean all pump surfaces with a dry
Weekly
and clean cloth.
Check dosing head screws.
If necessary, cross-tighten dosing
Every 3
head screws with a torque wrench at
months
5.5 Nm (+0.5 / -0 Nm). Replace
damaged screws immediately.
Every 2
years or
Replace diaphragm and valves (see
8000
section Perform service)
operating
hours *
*
For media which result in increased wear, the service
interval must be shortened.
Related information
1.7 Operation with loose dosing head screws
4.3 Installation of pump
8.3 Perform service
8.4 Diaphragm breakage
8.2 Cleaning
If necessary, clean all pump surfaces with a dry and
clean cloth.
36
8.3 Perform service
Only spare parts and accessories from Grundfos
should be used for maintenance. The usage of non-
original spare parts and accessories renders any
liability for resulting damages null and void.
Further information about carrying out maintenance
can be found in the service kit catalog on our
homepage (www.grundfos.com).
Warning
Risk of chemical burns!
When dosing dangerous media, observe
the corresponding precautions in the
safety data sheets!
Wear protective clothing (gloves and
goggles) when working on the dosing
head, connections or lines!
Do not allow any chemicals to leak from
the pump. Collect and dispose of all
chemicals correctly!
Before any work to the pump, the pump
must be disconnected from the power
Caution
supply. The system must be pressureless!
8.3.1 Dosing head overview
Example without deaeration valve.
1
2
3
9
Dosing head, exploded view
Pos.
Description
1
Safety diaphragm
2
Flange
3
Diaphragm
4
Valve on discharge side
5
Dosing head
4
5
8
7
6
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