Xylem G&L A-C 9100 Series, Instruction Manual

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figures of the last test. This is especially important where the pumped liquid tends to
form a deposit on internal surfaces.
• Inspect foot valves and check valves. A faulty foot or check valve will cause poor
performance. The check valve safeguards against water hammer when the pump
stops.
6.2 Flood-damaged pumps
If the pump is properly sealed at all joints and connected to both suction and discharge,
then it will exclude outside liquid. Therefore, it is only necessary to service the bearings,
stuffing box, and coupling after flood damage.
Perform the following service on a centrifugal pump after a flooded condition:
• Dismantle the frame, and then inspect the bearings for any rusted or badly worn
surfaces. Clean as necessary. If the bearings are free from rust and wear, then
reassemble and relubricate them with one of the recommended lubricants.
Depending on the length of time the pump has remained in the flooded area, it is
unlikely that bearing replacement is necessary. Only replace the bearings if rust or
worn surfaces appear.
• Inspect the stuffing box and clean out any foreign matter that will clog the box.
Replace packing that appears to be worn or no longer regulates leakage properly.
Clean and thoroughly flush mechanical seals.
• Dismantle and thoroughly clean the couplings. Lubricate the couplings where required
with one of the lubricants recommended by the coupling manufacturer.
6.3 Bearing maintenance
Bearing lubrication — Oil
Oil lubrication pumps are installed with Trico oilers. The oilers keep the oil level in the
housing constant.
Figure 19: Trico oiler
After the pump has been installed:
1. Flush the housing to remove dirt, grit, and other impurities that may have entered the
bearing housing during shipment or installation.
2. Refill the housing with proper lubricant. The housing must be filled using the Trico
oiler.
– The oil level will be maintained by the Trico oiler. See the Service section for proper
instructions.
6 Maintenance
28 G&L Pumps Series A-C 9100 Base Mounted Centrifugal Pumps INSTRUCTION MANUAL