Xylem e-XC, Instruction Manual

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are M6X1X8 mm or M8X1.25x10 mm. Check the size of the old set screws to confirm
the drill size required.
6. Apply a bead of thread locker to each set screw and fasten them into the impeller and
impeller wear ring.
Casing wear ring replacement
Casing wear ring replacement is outlined in the standard disassembly and assembly
procedures of the pump in
Disassembly on page 44and Reassembly on page 65
respectively.
It is important to note each casing wear ring utilizes two anti-rotational pins and two O-
rings. O-rings and pins should be replaced whenever the casing wear rings are replaced.
6.2 Bearing and coupling lubrication
Lubrication at initial startup
• Grease
– Bearings are packed with grease at the factory.
– Assuming the pump was stored in a clean and dry location before its first operation,
the bearings will not require attention before starting the pump.
– Monitor the bearings for an hour after pump startup to verify if they are operating
correctly.
• Oil
– Bearing housings will not be oiled at the factory prior to shipment.
– See
Lubricate the bearings on page 39 for installation instructions and lubrication
guidelines.
WARNING:
Do not attempt to run the pump without first lubricating the bearings. Doing so will cause
serious property damage.
Lubrication schedule
• Grease
– Periodic refilling of grease is not required. Regrease the bearings if the bearing
housings are removed for maintenance reasons. It is recommended to hand pack
grease onto the bearings before pressing them onto the shaft. Follow the standard
greasing procedure, outlined in
Lubricate the bearings on page 39, after
assembling the bearing housing.
– Changing out the grease is recommended every 3600 hours of operation at 2-pole
speeds and 7200 hours at 4-pole speeds. If environment conditions are excessively
dirty, wet, or above a 100°F (38°C) ambient temperature, then the grease should
be changed at 50% of the stated timeframes. If temperatures are at or exceed
180°F (82°C) within the bearing housing, then the grease should be changed at
50% of the stated timeframes.
• Oil
– Periodic addition of oil is required. Take care not to over or under fill the bearing
cavity. Inspect the oil level of each bearing housing using the sight glasses
provided with the pump. See the following figure for maximum and minimum oil
level requirements.
6 Maintenance
38 e-XC INSTRUCTION MANUAL