8 | Maintenance
36 / 49 Hidrostal AG
• Make sure that Preparation tasks for maintenance [▶31] has been
carried out first.
WARNING
Liquid possibly leaking under pressure.
Risk of severe injury!
• Wear safety goggles when opening the screw plug.
8.4.4.2 Drain in a vertical position
1. Stand pump on its suction flange.
2. Make sure that the pump is secured with lifting gear to prevent it from
tipping.
3. Tip the pump to slightly raise the position of the screw plug (1).
4. Loosen the screw plug until a brief hissing sound is heard or liquid runs
out.
ü If a brief hissing sound is heard:
5. Hold a cleaning cloth under the screw plug and tip the pump back into
the vertical position. If no more liquid leaks out, it can be expected that
little or no medium has leaked into the oil chamber.
Reinsert and tighten the screw plug (1).
ü If liquid is discharged:
6. A significant amount of liquid has leaked into the oil chamber. Tilt the
pump further to release any pressurised gas.
Once the pressure has been relieved: reinsert the screw plug (1).
7. Turn or tilt the pump so that the screw plug (1) is facing downwards.
8. Position a clean collection tank underneath the pump.
9. Remove the screw plug (1).
10. Allow the oil to drain into the collection tank.
8.4.4.3 Analysing the drained liquid
1. Pour the liquid from the collection tank into a clean, transparent
container, e.g. a beaker, and allow it to stand for several minutes.
ü If the liquid is bright, clear and thin, it could be the case that water has
leaked onto the base of the tank:
2. Continue to use the oil, see chapter Refilling the oil chamber [▶37].
3. Dispose of any water on the tank base as special waste.
ü If you are unsure about the oil condition:
4. Dispose of the liquid as special waste.
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