ProMinent Sigma 3 Basic Operating Instructions Manual page 54

Maintenance
Check the condition of the metering dia‐
phragm
Tightening torques
Liquid ends with integral relief valve
Changing gear oil
54
The diaphragm is a wearing part, the service life of which is dependent on
the following parameters:
System back pressure
n
Operating temperature
n
Feed chemical properties
n
When using abrasive feed chemicals, the diaphragm service life is
reduced. In these cases, more frequent checking of the diaphragm is rec‐
ommended.
Data
Tightening torques for dosing head
screws:
WARNING!
Warning of eye injuries
When opening the relief valve, a spring under high ten‐
sion can jump out.
– Wear protective glasses.
Draining gear oil
2
Fig. 21
1. Remove the vent screw (1).
2. Place an oil trough under the oil drainage plug (2).
3. Unscrew the oil drainage plug (2) from the power end housing.
4. Allow the gear oil to drain out of the power end.
5. Screw in the oil drainage plug (2) with a new seal.
Filling with gear oil
Prerequisite: Gear oil in line with the "Ordering information" chapter is
available.
1. Slowly pour gear oil through the vent screw (1) opening until the oil
inspection window (3) is half covered.
2. Allow the pump to run for 1... 2 minutes
3. Replace the vent screw (1).
Value Unit
12 ... 12.0 Nm
1
3
P_SI_0143_SW