Welch Vacuum 2546 WOB-L Pinston Pump - Manual (Page 9)

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Section 6: MAINTENANCE
6.10 MAINTENANCE ON A WELCH PRESSURE / VACUUM PUMP
Welch dry pressure/vacuum units are 100% oil-free. The pump employs a non-lube piston
and cylinder. No maintenance is necessary for the bearings. All bearings are sealed and
permanently lubricated. Lubrication should not be attempted. The units are built for continuous
duty operation with the quietness and durability of a diaphragm, but with piston performance.
Section 7: TROUBLESHOOTING
7.10 VACUUM PROBLEMS
Leakage, contamination, and unusual outgassing are the general causes of problems
associated 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
7.20 PRESSURE PROBLEMS
Leakage and contamination are the general causes of problems associated with poor
pressure. To operate at maximum effi ciency a system must be thoroughly clean. If the system
is completely clean and free from leaks, and unwarranted pressure problems still exist, the
pump/compressor should be checked by a service technician.
7.30 TROUBLESHOOTING GUIDE
Poor
Pumping
Speed
Poor
Pressure
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