SPP Pumps Auto Prime - High Flow Range XF300 & 400 - Manual (Page 17)

Operators Instructions for
XF300 & XF400 Range Centrifugal Pumps
Manual No/Rev
W77-009E / 2
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 17 of 23
7.2 Pump Fault Finding
POTENTIAL FAULT OR DEFECT:
Insufficient liquid delivered.
Liquid delivered at low pressure (Fails to achieve the required delivery head)
Loss of liquid after starting.
Excessive vibration.
Pump bearings run hotter than normal.
PROBABLE CAUSES
Speed too low.
Speed too high.
Blockage or Internal collapse of suction or delivery hose
Air leaking into pump casing or priming system.
Lubricating oil dirty or contaminated.
Foundation not rigid or pump mountings loose or worn.
Misalignment of pump and driver.
Impeller worn or increased clearances
Bearing worn.
Rotor out of balance due to blockage or damage.
Shaft bent.
CAUSE REMEDIAL ACTION
Speed too low. Check that the driver is functioning correctly and running at the
required speed.
Speed too high. Check that the driver is functioning correctly and running at the
required speed.
Blockage or Internal
collapse of suction or
delivery hose Check hoses, replace damaged hoses or clear blockage.
Air leaking into pump
casing or priming
system. Check all hose joints, plugs and pipes.
Check that the vacuum pressure seal is not leaking.
Bearing lubricating oil
dirty or contaminated. Drain the oil, check type of contaminant, if no metal pieces are
present, flush the bearing housing and refill with new oil. Run the
pump and monitor bearing noise and temperature.
If metal pieces are present check for shaft movement and if excessive
dismantle the pump and replace the pump bearings.
Foundation not rigid or
pump mountings loose
or worn. Ensure that the pump driver mounting bolts are tight and the pump
foundations are secure.
Misalignment of pump
and driver. Check and realign the pump and driver as specified.
Bearings worn. Remove the bearings, clean and inspect for damage and wear,
replace as necessary.
Rotor out of balance. Check the impeller for damage, replace as necessary.
Shaft bent. Check shaft run-out and replace if needed.