30
Fig. 36 DN 32 valve, suction side and discharge side
13.6 Replacing the diaphragm and gear oil for dosing
head with single diaphragm (no diaphragm
leakage detection)
13.6.1 Drain gear oil
Fig. 37
Drain gear oil
1. Unscrew the locking screw (B) and collect the gear oil in a
container.
2. Screw the locking screw (B) and the new gasket (1b) back in
and tighten securely.
13.6.2 Removing the dosing head
1. Close the suction and discharge lines and loosen the suction
and discharge valve connections.
2. Loosen the six dosing head screws (1q with 2q).
3. Remove the dosing head (2).
13.6.3 Replacing a single diaphragm (no diaphragm leakage
detection)
• Remove the diaphragm and fit a new diaphragm (Q) on the
suction side. See fig. 38.
Fig. 38 Replacing a single diaphragm
TM03 6471 4506
Caution
The O-rings must be correctly placed in the
specified groove.
Observe the flow direction (indicated by an arrow
on the valve)!
Only tighten plastic valves by hand.
Warning
Wear protective clothing (gloves and goggles)
when working on the dosing head, connections
or lines!
The dosing diaphragm should be replaced with
each gear oil change.
Before removing the dosing head, valves and
lines, empty any remaining medium in the dosing
head into a drip tray by carefully unscrewing the
suction valve.
Note
Only use original Grundfos Alldos gear oil!
For product number, see service instructions.
Pump type Version Description
DMH 251 Single/double
1.3 l white oil
(Paraffin 55 DAB7)
DMH 252, 10 bar Single/double
1.3 l white oil
(Paraffin 55 DAB7)
DMH 252, 16 bar Single/double 1.3 l DHG 68
DMH 253 Single/double 1.3 l DHG 68
DMH 254 Single 3.5 l DHG 68
DMH 254 Double 4.5 l DHG 68
DMH 255 Single 3.5 l DHG 68
DMH 255 Double 4.5 l DHG 68
DMH 257 Single 5.5 l DHG 68
DMH 257 Double 7.5 l DHG 68
Note
Collect the gear oil in a container and dispose of
it correctly.
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