31
13.6.4 Fitting the dosing head
• Fit the dosing head and cross-tighten the dosing head screws
(1q with 2q) using a torque wrench.
13.6.5 Filling with gear oil
1. Check that the locking screw (B) is tightened.
2. Slacken and remove the oil-filling screw (F).
3. Set the stroke-length adjustment knob (L) to "0".
4. Slowly add the hydraulic oil through the oil-filling opening (F)
until the oil reaches the mark on the oil dipstick.
5. Wait 30 minutes.
6. Let the pump run for approx. 5 minutes with a stroke-length
setting of 0 %.
7. Let the pump run for approx. 10 minutes with a stroke-length
setting of 40 %.
13.6.6 Checking the oil level
1. Switch off the pump, check the oil level and add oil,
if necessary.
2. Refit the oil-filling screw (F).
Torques
13.7 Replacing the diaphragm for dosing head with
double diaphragm
13.7.1 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).
13.7.2 Replacing a double diaphragm
1. Clean the intermediate disk (3q), sealing rings (4q) and
covering rings (5q). After a diaphragm breakage, replace the
parts by new ones.
2. Remove both clamping sleeves (6q) slightly using pliers.
After a diaphragm breakage, replace the parts by new ones.
3. Measure the outer wall thickness of both new diaphragms
(Q1 and Q2): s1
(Q1)
< s2
(Q2)
.
Fig. 39 Installation of diaphragm
1) The shape of the diaphragm varies depending on pump type.
4. Fit both new diaphragms (Q1 and Q2) and the parts (3q - 5q)
in the correct order, as is shown in the diagrams (the clamping
sleeves (6q) are used for centring purposes).
Note
See section 11. Start-up / shutdown for
subsequent start-up!
Caution
Risk of leaking oil and damage caused by oil
loss!
For each oil change, a new flat gasket (1b) must
be fitted!
Caution
After initial start-up and after each time the
diaphragm is changed, tighten the dosing head
screws.
After approximately 6-10 operating hours or
two days, cross-tighten the dosing head screws
using a torque wrench.
Pump type
Torque
[Nm]
DMH 251, 10 bar 8-10
DMH 251, 16 bar 10-12
DMH 251, 25 bar 13-15
DMH 252 8-10
DMH 253 10-12
DMH 254 50-54
DMH 255 50-54
DMH 257 50-54
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.
TM03 6474 4506
Pos. Components
1q Dosing head screw
2q Intermediate disk
2 Dosing head
Q1/Q2
See fig. 40
3q - 5q
Caution
Observe correct installation of diaphragms (Q1
and Q2)! See fig. 40.
Fit the thinner diaphragm (Q1) on the dosing side
and the thicker diaphragm (Q2) on the oil side/
pump side!
1q
2
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