Gasboy XU2A - Manual (Page 22)

Troubleshooting
Page 22 MDE-4320 Gasboy UHF Pump, Blackmer® XU2A Rebuild Kit Installation Manual • June 2004
Damaged Vanes • Foreign objects entering the pump
• Running the pump dry for extended periods of time
• Cavitation
• Viscosity too high for he vanes and /or the pump speed
• Incompatibility with the liquids pumped
• Excessive heat
• Worn or bent push rods or worn push rod holes
• Settled or solidified material in the pump at start-up
• Hydraulic hammer - pressure spikes
• Vanes installed incorrectly (see "Vane Replacement").
Broken Shaft • Foreign objects entering the pump
• Viscosity too high for the pump speed - EC Rotor & Shaft
required for fluid viscosities over 20,000 SSU
• Relief valve not opening
• Hydraulic hammer - pressure spikes
• Pump/driver misalignment
• Excessively worn vanes or vane slots
• Settled or solidified material in the pump at start-up
Mechanical Seal Leakage • O-rings not compatible with the liquids pumped
• O-rings nicked, cut or twisted
• Shaft at seal area damaged, worn or dirty
• Ball bearings over greased
• Excessive cavitation
• Mechanical seal faces cracked, scratched, pitted or dirty
Symptom Probable Cause