Xylem FLYFT P7900, Installation, Operation And Maintenance Manual

Page: 52 / 76

Part to service Action
Stator housing
Drive units with oil as
the seal lubricant.
1. Check that it is clean and dry.
– If there is oil in the stator housing, then drain and clean it. Check the
stator housing again after one week of operation. If there is still oil in
the stator housing, then change the seals.
– If there is water in the stator housing and there was water in the oil,
change the seals immediately.
– If there is water in the stator housing, but there was no water in the oil,
check all other connections.
2. Replace the O-rings.
Oil housing
Drive units with oil as
the seal lubricant
1. Check the oil quality:
– If there is water in the oil, then drain the oil and replace with new oil.
After one week of operation, check the oil quality again.
– If the oil is free from water, then fill the oil to the correct level, if
necessary.
2. Replace the filling plug O-rings.
Hydraulic parts 1. Check the general condition of the impeller or propeller and the wear ring.
2. Replace if necessary.
3. If applicable, check O-ring.
Zinc anodes Check and change if necessary.
Screw joints Check all externally accessible screw joints, and tighten if necessary to the
correct torque. See
Torque values
on page 65.
Electrical cabinets Check that it is clean and dry.
Connection to power Check that the connections are properly secured.
Level regulators
Check the condition and function. See
Check the leakage detectors
on page
52.
Temperature sensors Check the condition and function. See Check the temperature sensors on
page 51.
After any service involving the power connections, you must check the rotation before
operating the pump. See Check the impeller rotation on page 42.
6.2.2 Major overhaul
1. Perform a complete inspection service. See
Inspection
on page 49.
2. Do these additional steps:
Part to service Action
Motor: insulation
check
Drive units up to
1.1 kV
Check that the resistance between earth and phase lead is more than 5 MΩ.
Use a 500 VDC or 1000 VDC insulation and continuity tester.
Cable Check that the rubber sheathing is undamaged. Change if necessary.
Oil housing Change the lubricant.
General dismantling
and cleaning
1. Dismantle the pump completely.
2. Clean all the parts.
3. Reassemble after replacing bearings, O-rings, and seals.
Bearings Replace the bearings with new bearings.
O-rings and other
rubber sealing parts
Replace O-rings and other rubber sealing parts.
Seals Replace with new seals.
6 Maintenance
50 P7900 Installation, Operation, and Maintenance Manual