Gasboy XU2A - Manual (Page 21)

MDE-4320 Gasboy UHF Pump, Blackmer® XU2A Rebuild Kit Installation Manual • June 2004 Page 21
Troubleshooting
Troubleshooting
This section provides troubleshooting and maintenance information for pumps.
Troubleshooting Table
The following table contains a list of troubleshooting symptoms and probable causes.
Symptom Probable Cause
Pump not priming • Pump not wetting.
• Worn vanes
• Suction valve closed
• Air leaks in the suction line
• Strainer clogged
• Suction line or valves clogged or too restrictive
• Pump vapor-locked
• Pump speed too low for priming
• Relief valve partially open, worn or not seating properly
Reduced Capacity (Flow) • Pump speed too low.
• Suction valves not fully open
• Air leak in suction lines.
• Restriction in suction lines.
• Excessive restriction in the suction line (ie.: undersized
piping)
• Excessive system pressure (flow loss to pressure control
valve)
• Relief valve worn, set too low, or not seating properly
• Worn or damaged parts.
Noise • Excessive vacuum on the pump due to:
a. Undersized or restricted fittings in the suction line.
b. Pump speed too fast for the viscosity or volatility of the
liquid.
c. PUmp too far from fluid source
• Running the pump for extended periods with a closed
discharge line.
• Pump not securely mounted
• bearings worn or damaged
• Vibration from improperly anchored piping
• Bent shaft or drive coupling misaligned
• Excessively worn rotor
• Malfunctioning valve in the system
• Relief valve setting too low
• Damaged vanes (see following category)
• Vanes installed incorrectly (see "Vane Replacement")
Maintenance shall be performed by qualified technicians only. Follow
the appropriate procedures and warnings as presented in this manual.
NOTICE