Johnson Pump SPX MDR Manual De Instrucciones página 20

MDR
MDR/EN (1206) 3.2
Table 2: Possible causes of pump failures.
Problem Possible causes
Wear or damage of parts
Excessive vibration Short of head
or noise
Impeller is clogged with foreign
materials
Loose pump body screws
Wrongly installed O-ring
Leakage from pump body
Damaged O-ring
Dry running, thermal-shock,
running against closed valve, shock at handling, corrosion
Shaft break
Short of head
Dry running, excessive wear,
running against closed valve,
corrosion
Magnet housing
damage
Short of head
Impeller damage Excessive wear, corrosion
Excessive temperature
Impeller
deformation
Excessive temperature vs
system pressure
Problem solving
Remedy
Replace parts
Increase discharge head (see
paragraph 2.3 "Minimum back
pressure")
Remove foreign materials
Tighten screws
Replace O-ring
Replace O-ring. Make sure that
the material is resistant to the
media
Replace shaft Make sure that
the material is resistant to the media
Increase discharge head (see
paragraph 2.3 "Minimum back
pressure")
Replace magnet housing Make
sure that the material is resistant
to the media and that no dry
running will occur
Increase discharge head (see
paragraph 2.3 "Minimum back
pressure")
Replace impeller Make sure that
the material is resistant to the
media
Replace impeller (see paragraph
2.5 "Temperature range")
Replace impeller (see paragraph
2.6 "Maximum temperature
versus system pressure")
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