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10. Maintenance
10.1 General notes
Warning
When dosing dangerous media, observe the
corresponding safety precautions!
Risk of chemical burns!
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!
Warning
The pump housing must only be opened by
personnel authorised by Grundfos!
Repairs must only be carried out by authorised and
qualified personnel!
Switch off the pump and disconnect it from the power
supply before carrying out maintenance work and
repairs!
10.2 Cleaning and maintenance intervals
In the event of a diaphragm leakage, the dosing
liquid may leak out of the hole in the intermediate
flange between the pump and the dosing head. The
parts inside the housing are protected from the
dosing liquid for a short time (depending on the type
Caution
of liquid) by the housing sealing. It is necessary to
check regularly (daily) if liquid is leaking out of the
intermediate flange. For maximum safety, we
recommend the pump version with diaphragm
leakage detection.
11
9
Fig. 19 Exploded view of the valves
Pos.
Components
1
Supporting ring
2
Valve housing
3
Valve seat
4
Valve disk
6
Double-end stud
7
Washer
8
Cap nut
9
Valve housing
10
Flange
11
O-ring
12
O-ring
13
O-ring
14
Spring
15
Valve disk
The O-rings must be correctly placed in the specified
Caution
groove.
8 7
6 x
4
13
10
14
10.2.1 Changing the gear oil
Warning
The gear oil must only be changed by authorised and
qualified personnel.
For this purpose, send the pump to Grundfos or an
authorised service workshop.
To ensure trouble-free operation, it is recommended to regularly
change the gear oil.
Use exclusively original gear oil.
When changing the gear oil, check the dosing
Caution
diaphragm and, for safety reasons, replace, if
necessary.
10.2.2 Cleaning the diaphragm and valves
Clean the diaphragm and valves, and replace, if necessary (with
stainless-steel valves: inner valve parts):
•
At least every 12 months or after 3,000 operating hours.
•
In the event of a fault.
10.3 Cleaning the suction and discharge valves
If possible, rinse the dosing head, e.g. by supplying it
Caution
with water.
If the pump loses capacity, clean the suction and discharge
valves as follows:
See fig. 19.
1. Loosen the cap nuts (8) on the supporting ring (1).
2. Remove the valve housing (2/9) and other parts of the valve.
3. Remove the other internal parts, and clean or replace, if
necessary.
4. Re-assemble the valve according to the exploded view below.
5. Refit the valve.
6
2
11
1
15
3
12
17
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