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Repairs
Tightening torques
48
20.
Place the diaphragm (1) with the diaphragm mounting plate (2)
inside the hydraulic end.
21.
Position the dosing head with the screws so that the suction con‐
nector is pointing downwards - diaphragm sensor must be at the
bottom.
22.
First gently tighten the dosing head screws and then tighten cross‐
wise, tightening torque -
23.
Test the diaphragm rupture sensor - see
diaphragm rupture sensor' on page 49
24.
Screw the suction and discharge line on to the liquid end.
Fig. 19: Areas wetted by Hydro/ 4 (grey shaded)
Data
Tightening torque for screws:
Fill hydraulic oil in the hydraulic end
For the double-head versions, perform the following work simultaneously
on both dosing heads.
1.
Set the stroke adjustment dial (1) to "100%" and open the safety
relief valve (2) - tighten the knurled screw.
2.
Slowly fill hydraulic oil through the opening for the gearbox vent
stopper (4) until the oil inspection window (3) is covered to 1/2.
3.
Start the pump.
4.
Allow the pump to run for 1... 2 minutes.
5.
Replace the vent screw (3).
6.
Close the safety relief valve (1) - loosen the knurled screw.
7.
Check the pump for tightness by using maximum back pressure.
Check the tightening torque of the dosing head screws again
after 24-hours of operation!
Ä 'Tightening torques' on page 48 .
Ä Chapter 10.2 'Repair the
1
Value Unit
40.0 Nm
2
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