Major overhaul
For a major overhaul, take this action in addition to the tasks listed under Inspection.
Service item Action
Support and main bearing Replace the bearings with new bearings.
Mechanical seal Replace with new seal units.
Change the oil
A paraffin oil with viscosity close to ISO VG32 is recommended. The pump is delivered
from the factory with this type of oil. In applications where poisonous properties are of less
concern, a mineral oil with viscosity up to ISO VG32 can be used.
Empty the oil
1. Lay the pump on its side.
Lock the pump with supports to prevent it from rolling over.
2. Remove the oil screw.
There are two oil screws. Either screw can be used for drainage, but it is easier to drain
the oil if both oil screws are removed.
WARNING:
The oil housing may be pressurized. Hold a rag over the oil plug to
prevent oil from spraying out.
3. Turn the pump so that the oil hole faces downwards and let the oil run out.
Fill with oil
1. Replace the oil screw O-ring.
2. Put one of the oil screws back and tighten it.
3. Turn the pump so that the oil hole faces upwards and fill with new oil.
Quantity for version code 181/051: 2 L (2.1 qt.)
Quantity for version code 320/690: 1.7 L (1.8 qt.)
Maintenance
Flygt 2125 Installation, Operation, and Maintenance Manual 29
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