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Major overhaul
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.
1
1.
2.
Figure 5: Symbols
Empty the oil
1. Remove the strainer.
2. Lay the pump on its side.
3. Remove the oil screw.
4. Turn the pump so that the oil hole faces downwards and let the oil run out.
Flygt 2840.180 Installation, Operation, and Maintenance Manual
Service item
Action
Insulation
1.
Check the insulation between:
resistance in the
• Phase–phase on the stator
stator
• Phase–earth (ground)
The insulation should be > 1 megohm. Use a 1000-VDC megger to test the
insulation.
2.
If the resulting value is < 1 megohm, then contact an authorized service shop.
For a major overhaul, take this action in addition to the tasks listed under Inspection.
Service item
Support and main bearing
Mechanical seal
2
Inspection screw
Oil screw
See
Remove the impeller MT, HT
Lock the pump with supports to prevent it from rolling over.
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.
Action
Replace the bearings with new bearings.
Replace with new seal units.
(page 26).
Maintenance
25
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