105-B00 Page 14/16
PUMP TROUBLESHOOTING
NOTICE:
Maintenance shall be performed by qualified technicians only,
following the appropriate procedures and warnings as presented in this manual.
LEAKAGE
Location
Probable Cause/Corrective Action
Between the head & casing
Damaged head O-ring: Inspect and replace if necessary.
Burrs/dirt in head O-ring groove or cylinder: File and clean as necessary.
Around the shaft
New Mechanical Seals: New seals may leak slightly at start up, but
should seal up shortly thereafter.
Damaged mechanical seals: Check for damaged O-rings or cracked,
scratched or worn seal faces
SHAFT BINDING
Probable Cause
Corrective Action
Burrs, dirt or foreign particles on the heads or discs.
During assembly, both heads and discs must be clean and smooth. File
any burrs or rough spots, and wipe the discs with a clean cloth and
alcohol to remove any dirt or foreign particles.
Improper locknut adjustment.
Locknuts must be adjusted properly to center the rotor and shaft between
the heads. Refer to "Locknut Installation" on Page 10.
Contaminated mechanical seal faces.
Any trace of grease or dirt on the seal faces will prevent the faces from
mating properly, causing the rotor and shaft to bind or turn hard. Use a
tissue paper & alcohol to clean the seal faces. NOTE: Apply a light oil or
suitable lubricant to bronze seal faces only.
OTHER POSSIBLE CAUSES OF SHAFT BINDING:
• Foreign particles on rotor, liner or vanes.
• Damaged vanes or rotor.
• Bent push rods.
• Liquids that "set up" when inactive.
OVERHEATING
Probable Cause
Corrective Action
Continual, full bypassing of the liquid.
The relief valve should be adjusted such that the pump will not bypass
during normal operation.
WARNING: Internal bypassing of liquid
elevates the liquid temperature. The internal bypass valve should
only be used for brief periods and at differential pressures below
125 psi.
For extended periods of higher pressures, the internal bypass port
must be plugged and the liquid returned back to the source.
OTHER POSSIBLE CAUSES OF OVERHEATING:
• Improper relief valve adjustment
(See "Relief Valve" on Page 3).
• Plugged discharge line.
• Closed valve.
