Operating instructions

Interval Maintenance work Personnel
After approx. 5,000 oper‐
ating hours
Change gear oil - refer to "Changing gear oil" in this chapter. Instructed personnel
Quarterly Check the oil level.
Quarterly*
n Check that the metering lines are fixed firmly to the liquid end.
n Check that the suction valve and discharge valve are correctly
seated.
n Check that the dosing head screws are tight
n Check the condition of the metering diaphragm - see
Ä “Check
the condition of the metering diaphragm” on page 53 .
n Check that the flow is correct: Allow the pump to prime briefly.
n Check that the electrical connections are intact
Technical personnel
* Under normal loading (approx. 30 % of continuous operation).
Under heavy loading (e.g. continuous operation): shorter intervals.
The metering diaphragm is a wear part, the service life of which is
dependent upon the following parameters:
n System back pressure
n Operating temperature
n Feed chemical properties
When using abrasive feed chemicals, the diaphragm service life is
reduced. In such cases, more frequent checking of the diaphragm is rec‐
ommended.
Data Value Unit
Tightening torques for dosing head
screws:
4.5 ... 5.0 Nm
WARNING!
Warning of eye injuries
When opening the relief valve, a spring under high tension
can jump out.
– Wear protective glasses.
Draining gear oil
1. Remove the vent screw (1).
2. Place an oil tray under the oil drain plug (2).
3. Unscrew the oil drain plug (2) out of the drive housing.
4. Allow the gear oil to run out of the drive.
5. Screw in the oil drain plug (2) with a new seal.
Filling with gear oil
Standard liquid ends:
Check the condition of the metering dia‐
phragm
Tightening torques
Liquid ends with integral relief valve
Changing gear oil
Maintenance
53