Welch Vacuum 2567B-50 WOB-L Pinston Pump User Manual
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Section 5: TROUBLESHOOTING
5.10 Vacuum
Problems
Leakage, contamination and unusual outgassing are the general causes of problems with poor
vacuum. To operate at maximum effi ciency a system must be thoroughly clean. If the system is
completely clean and free from leaks, and unwarranted vacuum problems still exist, the pump
should be checked. A simple criterion for the condition of the pump is the determination of its
maximum vacuum capability. This can be accomplished by blocking of the intake and reading
the vacuum level on the gauge (See Section 2.8).
5.11 Troubleshooting
Guide
Poor
Pumping
Speed
Poor
Vacuum
Loud
Unit
Possible Cause
Corrective Action
X
X
X
Damaged valves
Replace fl apper valves
X
X
X
Debris in valves
Remove debris and check for valve damage
X
X
X
Damaged gasket
Replace gasket
X
X
X
Loose head screw
Tighten head screw
X
X
X
Loose fi tting
Tighten fi tting