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3.203  Forced Oil Flushing Procedure

 

1.  Check the oil level, if the oil level is well above the fill mark, (This may indicate either the pump has been 

 

 

overfilled with oil or has ingested a liquid or a large amount of vapor water or organic solvents.)  

 

 

Please go to step 2. If the oil level is even with the fill mark and you do NOT suspect corrosive gases or 

 

 

particulates (hence forth called contaminants) ingested have damaged the mechanism, run the pump for 

 

 

15 minutes to allow the pump oil to warm up before going to step 2.

 

2.  Turn off motor for the vacuum pump. Drain the oil into a clear plastic container (may need pliers to open 

 

 

drain valve).  Look for contaminations settling to the bottom of container.  If you see contaminants, you 

 

 

will need to repeat step 3 through 5 several times until the oil comes out clear.  The oil you drained from 

 

 

the pump came from the oil case only.  There may be contaminants in the pumping mechanism.  

 

 

To be sure all contaminants have been removed, the pump mechanism needs to be flushed.

 

3.  Make sure the belt guard is installed before proceeding further. Attach a short hose to the drain valve

 

  

which runs into a clear plastic container.

 

4.  Flushing the pump is carried out by adding a cup of DUOSEAL vacuum pump oil through the intake port   

 

 

(IN) while the pump is turned on for 15 to 20 seconds.  While adding the pump oil, the palm of your hand

 

 

 is placed lightly over the exhaust port (OUT). Look for water coming out of the drain. Turn off the pump.

 

5.  Repeat step 4 until clean oil comes out of the drain hose.

 

6.  Close the drain valve and fill the pump with the amount of DUOSEAL vacuum pump oil your pump needs.

 

7.  Plug the intake (IN) port with a rubber stopper.  Turn the pump on and run the pump for 10 minutes.  

 

 

Close the gas ballast.

 

8.  Check the vacuum reading of the pump by connecting a thermocouple gauge tube to the pump’s intake.  

 

 

If the pump is running nearly as good as when it was new, the total pressure reading you will read on 

 

 

wither of these two gauges will be at least 10 micron.

 

A simple way to connect the gauge tube to the pump is to run the threaded tip of tube through a hole in a rubber 

 

stopper.  Use pump oil as a lubricant for inserting the tube.  The stopper chosen should be bigger than the outer

 

diameter of the intake flange.

3.204  Refilling The Pump

 

After you are satisfied that the pump has been thoroughly flushed, refill the pump by pouring new DUOSEAL oil 

 

into the exhaust port.  Fill to the indicated level and start the pump with the intake closed.  A gurgling noise is 

 

characteristic when high pressure air is drawn through the pump.  It should disappear quickly as the pressure 

 

within the pump is reduced.  If gurgling continues, add sufficient additional oil through the exhaust port until 

 

gurgling ceases.

3.30  Shaft Seal Replacement

 

To replace the shaft seal of a pump, drain the oil and remove the pump pulley and key.  Remove the screws 

 

securing the old seal and pry it loose with a screwdriver or similar wedge, being careful not to mar the surface 

 

of the pump body against which the seal fits.  Discard the seal and its gasket, inspect all surfaces and repair any 

 

damages with a fine abrasive stone.  Wipe all sealing areas clean and place a film of DUOSEAL oil on both the 

 

shaft and the inside bore of the new shaft seal.  Using a new gasket, carefully slide the new seal into position and 

 

center it on the shaft.  It is not necessary to apply any sealant to the gasket.  Tighten the mounting screws 

 

uniformly and refill the pump with DUOSEAL oil.  Follow instructions included in repair kit.

Summary of Contents for WELCH DUOSEAL 1397C-46

Page 1: ...of the pump body bursting and causing possible injury to personnel in the area Gardner Denver Inc Welch Vacuum Technology 5621 W Howard Street Niles IL 60714 Phone 847 676 8800 Fax 847 677 8606 Techn...

Page 2: ...ons are found where failure to observe the instruction could result in damage to the equipment associated equipment and process These units confirm to the SI International system of units of measureme...

Page 3: ...vel 10 3 30 Shaft Seal Replacement 10 3 40 Repairing Oil Leaks 11 3 50 Repairing Vacuum Leaks 11 3 60 Drive Problems 11 Section 04 Trouble Shooting Guide 4 10 Poor Vacuum Readings 12 4 20 Noisy Pump 1...

Page 4: ...SEAL pumps should be mounted in a horizontal plane 1 122 Unmounted Pumps If you have purchased an unmounted pump refer to parts list for information concerning the motor motor pulley and belt necessar...

Page 5: ...e gas flow is substantially molecular in character The gas flow is then dependent upon the kinetic activity of the molecules to bring it to the intake of the pump 1 162 The Effects of Conductance It h...

Page 6: ...e yourself with the function and action of the pump which you have now required Remove the intake and exhaust port plugs and temporarily provide a stopper for the intake and a dust cap for the exhaust...

Page 7: ...f the volume of the mixture this depending upon the amount of air added condensation of the vapor is wither entirely avoided or substantial reduced 2 223 Pump Function With Gas Ballast In a pump funct...

Page 8: ...rich in hydrogen and observing a sudden change in pressure on an electrical gauge The difference in calibration of these gauges for air and other gases will produce a distinct change in the pressure...

Page 9: ...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 a...

Page 10: ...rubber stopper Turn the pump on and run the pump for 10 minutes Close the gas ballast 8 Check the vacuum reading of the pump by connecting a thermocouple gauge tube to the pump s intake If the pump is...

Page 11: ...ng surfaces cleaned of any nicks 3 50 Repairing Vacuum Leaks 3 501 Surface Preparation Good Vacuum seals are an essential and important attribute of a good mechanical pump A good seal is dependent upo...

Page 12: ...t a forced oil flush 5 If noise level is still unsatisfactory consult with WELCH Technical Service at 847 676 8800 Ext 1 4 30 Excessive Oil Mist 1 Check oil level Maintain the level between the two li...

Page 13: ...0Hz Electrical Requirements 3 1 Phase Replacement Parts Part No Shaft Seal Lip Seal 1401F 01 Shaft Seal Mechanical Seal 1401F Dust Cap for Exhaust 41 1501 Air Filter Screen 41 0937 Intake Chamber Cove...

Page 14: ...14 Section 6 DIMENSIONAL DRAWING 1397B 01...

Page 15: ...ange High RPM direct drive vacuum pumps on the other hand experience a rapid fall off of pumping speed below 100 microns A comparison of the DuoSeal pumping speed curves shown below versus high RPM pu...

Page 16: ...16 Section 8 EXPLODED VIEW...

Page 17: ...1 61 8691 INTAKE RING LARGE FINISHED 70 1 61 8693 INTAKE CHAMBER WELCH GRAY 71 2 61 8712 1 1 O RING 372 VITON N S 1401F 1 1 MECHANICAL SEAL KIT N S 1 99 5282 1 1 SEALANT 6cc Item Qty P N A B Descripti...

Page 18: ...18 VIEW AND PARTS LIST FOR MODEL 41 1482 Parts List for Model 41 1482 Item Qty P N Description 1 1 41 1482 Oil Case Machined for 1397 2 2 41 3753 Oil Case Window 3 1 61 2278 Drain Valve...

Page 19: ...onnection kit Cat No 141601 for models1400 1405 1376 1380 1402 Standard Exhaust Filter Use with pump model Dimension Catalog Number Diameter Height Filter Replacement Element 1392 1399 1400 1376 1380...

Page 20: ...Height A2 Cat No 1 NW16 to 4 CFM 140 L min 3 75 5 25 8 25 541001 Stainless Steel Element for ISO NW 16 Trap 1 541921 Stainless Steel Element for ISO NW 25 and NW 40 Traps1 541922 Removable 3 quarter...

Page 21: ...significant adverse health effects are expected to occur upon short term exposure to this product Aspiration of liquid into the lungs can cause severe lung damage or death Eye Contact Minimal eye irri...

Page 22: ...ir Eye Contact Check for and remove contact lenses Flush eyes with cool clean low pressure water while occasionally lifting and lowering eyelids Seek medical attention if excessive tearing redness or...

Page 23: ...ct recovery or disposal Prevent entry into waterways or sewers In urban area cleanup spill as soon as possible In natural environments seek cleanup advice from specialists to minimize physical habitat...

Page 24: ...c vapor respirator equipped with a dust mist prefilter should be used Protection factors vary depending upon the type of respirator used Respirators should be usedin accordance with OSHA requirements...

Page 25: ...product However if spilled this product and any contaminated soil or water may be harmful to human animal and aquatic life Also the coating action associated with petroleum and petroleum products can...

Page 26: ...rd categories No SARA 311 312 Hazard categories identified SARA 313 This product contains the following components in concentrations above the minimis levels that are listed as toxic chemicals in 40 C...

Page 27: ...for Research on Cancer NTP National Toxicology ProgramNIOSH National Institute of Occupational Safety and Health OSHA Occupational Safety and Health Administration NPCA National Paint and Coating Man...

Page 28: ...um Technology and receipt or possession does not convey any rights to loan sell or otherwise disclose said information reproduction or use of said information for any purpose other than that in connec...

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