Welch Vacuum 2585B-50 WOB-L Pinston Pump - Manual (Page 10)

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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
Section 6: SPECIFICATION
6.10 Pump
Specifi cations
Model 2585
Free Air Displacement 7.1 CFM @60Hz
(201 L/min. @60Hz)
10.0 M3 @50Hz
(168 L/min. @50Hz)
Ultimate Pressure 60 Torr, (80mbar)
Maximum Vacuum 27.6 In.Hg.
Motor Horsepower 1/3 (250 watts)
Tubing needed I.D. 3/8”, (10mm)
Intake & Exhaust Thread 3/8 NPT
Weight 22.5 lbs (10.3 Kg)
Overall Dimensions 17 x 7.5 x 12 Inches
43.2 x 19.1 x 30.5 cm
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 Fitting Tighten Fitting