Major Overhaul - Xylem FLYFT P7900 Installation, Operation And Maintenance Manual

6 Maintenance
After any service involving the power connections, you must check the rotation before
operating the pump. See

6.2.2 Major overhaul

1. Perform a complete inspection service. See
2. Do these additional steps:
50
Part to service Action
Stator housing 1. Check that it is clean and dry.
Drive units with oil as – If there is oil in the stator housing, then drain and clean it. Check the
the seal lubricant.
– If there is water in the stator housing and there was water in the oil,
– If there is water in the stator housing, but there was no water in the oil,
2. Replace the O-rings.
Oil housing 1. Check the oil quality:
Drive units with oil as – If there is water in the oil, then drain the oil and replace with new oil.
the seal lubricant
– If the oil is free from water, then fill the oil to the correct level, if
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
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
52.
Temperature sensors Check the condition and function. See
page 51.
Check the impeller rotation
Part to service Action
Motor: insulation Check that the resistance between earth and phase lead is more than 5 MΩ.
check
Use a 500 VDC or 1000 VDC insulation and continuity tester.
Drive units up to
1.1 kV
Cable Check that the rubber sheathing is undamaged. Change if necessary.
Oil housing Change the lubricant.
General dismantling 1. Dismantle the pump completely.
and cleaning
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 Replace O-rings and other rubber sealing parts.
rubber sealing parts
Seals Replace with new seals.
stator housing again after one week of operation. If there is still oil in
the stator housing, then change the seals.
change the seals immediately.
check all other connections.
After one week of operation, check the oil quality again.
necessary.
Torque values
on page 65.
on page 42.
Inspection
P7900 Installation, Operation, and Maintenance Manual
Check the leakage detectors
Check the temperature sensors
on page 49.
on page
on