Paco-Pumps KP Installation, Operation And Maintenance Instructions page 17

B1d.1
4/06
Supercedes 8/05
TROUBLE SHOOTING-POSSIBLE CAUSES (Cont'd)
25. The casing and impeller wear rings may be exces-
sively worn.
26. There may be internal leakage from the discharge
to the suction compartments as the result of
internal gasket failure.
27. There may be a misalignment of the pump shaft.
28. The shaft may chatter because it is bent.
29. The pump may run rough due to improper
balancing of the impeller.
30. The shaft may not be running due to worn bearings.
31. The impeller may be rubbing against the inside of
the case.
32. The concrete pad might not be of sufficient size to
provide pump stability.
33. The pump may have become misaligned during
installation.
34. The operating conditions of the installation do not
agree with the data specified when the pump was
purchased.
35. The shaft seal may be incorrectly installed, or the
stuffing box has not been packed correctly.
36. The shaft sleeve may be scored or pitted in the
region of the packing due to dirt or abrasive matter
in the flushing fluid.
37. Excessive tightening of the packing gland may block
the flushing port thereby diminishing the sealing fluid
flow.
38. Packing material may have become wedged or
extruded between the shaft and the bottom of the
stuffing housing due to excessive clearance on the
Packing backup washer.
39. The mechanical seal may have been damaged by
running dry.
40. There may be excessive axial thrust (side loading)
due to improper impeller central alignment.
41. The bearings may be worn.
42. The bearings may have been damaged during
installation and/or dirt or other foreign matter may
have entered the bearings during greasing or
oiling.
43. Excessive greasing may cause the bearings to
overheat.
44. Inadequate lubrication may be causing bearing
failure.
45. Dirt may have entered the bearings past the
O-Rings.
46. Moisture may have entered the bearing housing
causing the bearings to rust.
PACO PACO PACO
PACO PACO
PUMPS
17