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Welch 8905 Owner'S Manual Download Page 22

22

 

11.   REPLACE THE LIP SEAL HOUSING

 

     a)  It is recommended that you use 3 lockwashers to secure the LIP SEAL HOUSING.  Uniform 

 

 

tightness is important. Repeatedly finger-tight the 3 screws in sequence. 

 

 

Then lastly, turn them very tight.

 

     b)  Replace the Woodruff Key in its slot.  Use your small finger or a thin tool to hold it in place as 

 

 

you replace the motor coupling housing.  Be sure the key stays in position.  If it should fall even 

 

 

a little distance, use a screwdriver to push it back up in the key slot. 

 

 

Then tighten the set key screw—very tight.

  

12. 

REPLACE OTHER COMPONENTS

 then reassemble the motor and other components.

Summary of Contents for 8905

Page 1: ...art No 67 1483R2 5 Web Page www welchvacuum com Printed in USA For outside of U S and Canada contact your local Gardner Denver sales office see back page WARNING Do not block the exhaust port Pressure will build up with the potential of oil case bursting with possible injury to personnel WARNING Pumps being run continuously above 1 torr should use an exhaust oil recycler WARNING Pumps not recommen...

Page 2: ...f IEC1010 of warning will be found on the pump Caution refer to accompanying documents Caution risk of electrical shock Caution hot surface 2 WARNING Warnings are given where failure to observe instruction could result in injury or death to people WARNING Motor includes a self resetting thermal cutout and the pump could restart without actuation under fault condition CAUTION Cautions are found whe...

Page 3: ... 2 06 Intake Anti Suckback Protection 10 2 07 Pump Lubrication 10 2 08 Exhaust Filter 10 2 09 Gas Ballast Valve 10 2 10 UNIBARBTM Intake Fitting 11 Section 03 Specifications 12 3 01 Specification Chart 12 Section 04 Motor Power Specifications Features 14 4 01 Motor Specifications Chart 14 4 02 Changing the voltage setting 8907 8912 8917 A Models 15 4 03 Changing the voltage setting 8907 8912 8917 ...

Page 4: ...25 Section 08 Specifications 26 8 01 Shaft Seal Replacement 26 8 02 Minor Repair Kits 26 8 03 Major Factory Repair 26 Section 09 Accessories 27 9 01 Pump Oil 27 9 02 Exhaust Filter 27 Section 10 Drawings and Speed Curve 28 10 10 Speed Curve 28 10 20 Dimensional Drawing 29 10 30 Pump Exploded Views and Parts List 30 10 40 Module Exploded Views and Parts List 36 10 50 Oil Case Exploded View and Part...

Page 5: ...xhaust Provisions Exhaust connections will be determined by the type of system to be exhausted and the desired cleanliness of the air surrounding the pump Under normal pumping conditions the optional exhaust filter will be adequate Refer to Section 9 Accessories for available exhaust filters Where extreme exhaust conditions are encountered it is best to pipe the exhaust out of the building Always ...

Page 6: ...protection devices such as fuses or circuit breakers Know the location of the circuit breaker protecting the electrical outlet for the pump Only the Models 8907C 8912C and 8917C have global motors that operate over a wide range of voltages 100 120V 200 30V They also operate at frequencies of 50Hz and 60 Hz Power is single phase For Models 8920 8925 Compare the pump motor rating printed on a label ...

Page 7: ...eed at the vacuum chamber the conductance of the line must be considerably greater than the speed of the pump Sharp bends in vacuum lines also contribute to conductance To avoid reductions in pumping speed minimize the number of 90º angles in the vacuum system 1 07 Vacuum Gauges The type of vacuum gauge to be used in a system is determined largely by the pressure range to be measured A thermocoupl...

Page 8: ...y the internal components of the pumps its purpose is to illustrate the general operating principles of vacuum pumps The rotary action of the pump creates a hollow space of chamber 1 which expands as the pump rotates As the chamber expands the pressure in the chamber decreases As a result gas is drawn into the chamber due to the difference in pressure between the chamber and the inlet 4 to the cha...

Page 9: ...his all the components of the system contain minute sources of gas leakage which are impossible to seal completely against atmospheric pressure Outgassing of materials within the system provide additional sources of gas As a result after prolonged pumping a state of equilibrium is reached in which the gas introduced from all the leakage sources is balanced by the ability of the pump to remove gas ...

Page 10: ...imes referred to as Oil Mist Eliminators See Section 9 Accessories 2 09 Gas Ballast Valve The gas ballast valve can increase the pump s water vapor tolerance The gas ballast valve is sometimes referred to as a vented exhaust valve In many vacuum pump applications the gases being pumped from a system are a combination of permanent gases and undesirable vapors such as water vapor Under some conditio...

Page 11: ...ference on pumping speed It is the best to have the largest connection I D internal diameters as possible However we recognize many lab appliances use hose barbs accepting small I D hose The conductance of a tube is proportional to the cube of its diameter and inversely proportional to its length Therefore connecting line should be as large in diameter and short in length as practical Included is ...

Page 12: ...er 1 4 1 2 3 4 Oil Capacity quarts liters 0 42 0 4 1 3 1 2 1 2 1 1 Unibarb for Unibarb for Unibarb for 3 16 and 7 16 9 16 and 13 16 9 16 and 13 16 Intake Connection I D Hose I D Hose I D Hose Threaded for Threaded for Threaded for 3 4 20 1 1 8 20 1 1 8 20 Tubing needed I D in inches 3 16 or 7 16 9 16 or 13 16 9 16 or 13 16 in mm 5 or 11 14 or 20 14 or 20 Exhaust Connection 3 4 20 Thread 1 20 Threa...

Page 13: ...ters 1 0 0 95 0 9 0 86 0 8 0 76 Unibarb for Unibarb for Unibarb for 7 16 and 13 16 7 16 and 13 16 7 16 and 13 16 Intake Connection I D Hose I D Hose I D Hose Threaded for Threaded for Threaded for 1 1 8 20 1 1 8 20 1 1 8 20 Tubing needed I D in inches 7 16 or 13 16 7 16 or 13 16 7 16 or 13 16 in mm 11 or 20 11 or 20 11 or 20 Exhaust Connection 1 20 Thread 1 20 Thread 1 20 Thread Gas Ballast Connec...

Page 14: ...912C 02 230 50 1 1 2 230V 50Hz European Schuko Cord Plug CE 8912C 05 100 50 60 1 1 2 100V For Japan with US Cord Plug 8917A 115 230 60 1 1 2 115V 60Hz Standard Model CSA 8917C 02 230 50 1 1 2 230V 50Hz European Schuko Cord Plug CE 8917C 05 100 50 60 1 1 2 100V For Japan with US Cord Plug 8917W 115 60 1 1 2 115V 60Hz To be wired by qualified electrician 8920A 115 208 230 50 60 1 3 4 115V 60Hz Stand...

Page 15: ...ving the cover 3 Locate the voltage selection switch next to the external electrical power cord connector 4 Remove the voltage marker 61 6071 The switch is very tightly installed To remove place index and middle finger along the top edge and pull backwards 5 Change the voltage selection switch 61 1303 to the opposite position 6 Rotate the voltage marker 180 and insert into previous location The vo...

Page 16: ...or when using outside of the United States replace the line cord plug with one suitable for the voltage connection which meets the voltage to which the motor now is wired to require to operate 4 05 Other Electrical Configurations Other electrical configurations of Welch pumps may be available Check with Welch for 3 Phase Explosion Proof and other motor configurations 4 06 Explosion Proof Pumps Exp...

Page 17: ...d the motor At elevated ambient temperatures under these conditions the thermal protection switch may cut out The oil may tend to thin out at these temperatures losing its ability to lubricate effectively During operation at these pressures oil mist may be generated at the exhaust port The mist has the appearance of a small cloud of smoke Use of an Exhaust Filter with coalescing element is require...

Page 18: ... If the pump s ultimate pressure is unusually high the pump may be badly contaminated low on oil or mechanically defective However if the pressure is only slightly higher than the pump s guaranteed pressure an oil change may be all that is needed to bring performance up to specifications Be sure to use only DIRECTORR Premium or Gold Oil in vacuum pumps the ultimate pressure guarantee does not appl...

Page 19: ... upon the materials pumped Clean dry air at pressures below 50 mtorr are the most forgiving conditions To determine your own oil change interval visually monitor the pump oil conditions at regular intervals If you suspect harsh operating conditions daily visual checks are recommended When the oil becomes cloudy dark or includes particles of solids it is time to change the oil Oil may be visually c...

Page 20: ...ounting plate 7 INSTALL NEW SHAFT SEAL with flat side of the seal toward the motor Use a little oil on the lip seal outside periphery The seal is located 0 09 in from the coupling end inside the bore Seal assembly tool 61 2172A used to install and locate the lip seal 8 PLACE THE PUMP MODULE on a table with shaft up Slide shaft insertion tool 61 2170A over the shaft end and place the new gasket ove...

Page 21: ... a Place the lip seal housing in a vise place a rag against the surfaces to protect against scratching Gently hammer a screwdriver against the lip seal at opposite sides until it pops out b Before inserting the new lip seal use your finger to add a thin coating of pump oil around its periphery c Place the new lip seal in the coupling It is essential that it be positioned perfectly flat on the bott...

Page 22: ...y turn them very tight b Replace the Woodruff Key in its slot Use your small finger or a thin tool to hold it in place as you replace the motor coupling housing Be sure the key stays in position If it should fall even a little distance use a screwdriver to push it back up in the key slot Then tighten the set key screw very tight 12 REPLACE OTHER COMPONENTS then reassemble the motor and other compo...

Page 23: ...nd three split lock washers holding outer lip seal assembly to the mounting plate Remove and discard outer lip seal assembly and gasket 5 WIPE OIL AND CLEAN the shaft surface and gasket sealing area Inspect all sealing surfaces These must be thoroughly cleaned and free of any scratches 6 ASSEMBLE OUTER LIP SEAL ASSEMBLY WITH GASKET Use a little oil on seal and shaft IMPORTANT Assemble the part wit...

Page 24: ...atmospheric pressure expands in volume by a factor of 750 000 to 10 000 000 or more The pump must remove this added volume to maintain the desired vacuum Fortunately a number of effective techniques for leak detection have been developed Large Leaks Locate by pressurizing the system and painting the suspected area with a thick soap solution Escaping air will produce soap bubbles ...

Page 25: ...ed 4 Pump to be repaired Pump generates 1 Pump overfilled with oil 1 Drain excess pump oil excessive smoke 2 Pump operating continously 2 Use larger capacity pump or or oil mist from above its maximum modify your vacuum system exhaust port operation pressure 1 Pump oil contaminated by 1 Flush and change pump oil Use foreline process gases or other trap in futher Consider using a oil filtration Pum...

Page 26: ...r Center for repair Obtain a Returned Goods Number from Welch Vacuum before returning any vacuum pump These facilities are well equipped and staffed with experts to insure prompt reconditioning of all returned pumps Broken worn scored or corroded parts are replaced with new parts and the pump is thoroughly evaluated and tested to determine that it meets the performance requirements For warranty or...

Page 27: ... 02 Exhaust Filter A minor repair kit is available that provides a group of parts that can easily be replaced in the field NOTE For additional information on Accessories Parts or Products please consult Welch Vacuum s Laboratory Products Catalog or Welch s website at www welchvacuum com Quantity 1 Liter 1 Gallon 5 Gallon 55 Gallon Directorr Premium 8995P 11 8995P 15 8995P 20 8995P 25 Directorr Gol...

Page 28: ...28 Section 10 DRAWINGS AND SPEED CURVE 10 10 Speed Curve ...

Page 29: ... 90 9 60 6 54 4 76 7 00 9 88 5 05 1 44 7 92 1 90 7 60 9 45 0 87 0 89 8 78 1 61 0 94 1 18 8917A 18 90 9 60 6 54 4 76 7 00 9 88 5 05 1 44 7 92 1 90 7 60 9 45 0 87 0 89 8 78 1 61 0 94 1 18 8920A 21 00 10 40 6 14 3 86 8 90 10 40 0 75 7 85 1 60 8 60 10 30 1 00 1 10 9 40 8 20 1 82 1 25 2 07 8920C 02 21 00 10 40 6 14 3 86 8 90 10 40 0 75 7 85 1 60 8 60 10 30 1 00 1 10 9 40 8 20 1 82 1 25 2 07 8925A 20 40...

Page 30: ...e 34 3 61 2157A 2 O ring Fluoroleast 007 Item Qty P N Note A Description 35 1 61 2214B Wear Plate 36 1 61 2149B 1 Gasket 37 2 2 62 0432 Lock Washer 6 38 1 61 2406 Mounting Plate 39 1 61 6324 Gas Ballast Assembly 40 1 61 9282A 1 O ring Fluoroelast 011 41 1 61 9743 1 Drip Pad 42 1 61 2357 Intake Adapter 44 1 61 2159A 1 O ring Fluoroelast 116 45 3 2 00 6708 Screw Socket Hd 10 32x 1 2 46 1 61 2401 Mot...

Page 31: ...r 17 3 2 63 0193 Lock Washer 1 4 18 1 61 6322 Mounting Plate 19 1 61 2157A O ring Fluoroelast 007 20 1 61 9282A O ring Fluoroelast 011 Item Qty P N Description 21 1 61 6324 Gas Ballast Assembly 22 3 62 0270 Screw Socket Hd M6x20 23 1 66 0200 O ring Fluoroelast 216 24 1 61 6323 Intake Fitting Assembly 25 1 61 6360 Top Cover 26 2 62 0331 Screw Socket Hd M8x20 Blk 27 1 61 6038 Coupling Rubber 28 1 61...

Page 32: ...r 17 3 2 63 0193 Lock Washer 1 4 18 1 61 6322 Mounting Plate 19 1 61 2157A O ring Fluoroelast 007 20 1 61 9282A O ring Fluoroelast 011 Item Qty P N Description 21 1 61 6324 Gas Ballast Assembly 22 3 62 0270 Screw Socket Hd M6x20 23 1 66 0200 O ring Fluoroelast 216 24 1 61 6323 Intake Fitting Assembly 25 1 61 6360 Top Cover 26 2 62 0331 Screw Socket Hd M8x20 Blk 27 1 61 6038 Coupling Rubber 28 1 61...

Page 33: ...r 17 3 2 63 0193 Lock Washer 1 4 18 1 61 6322 Mounting Plate 19 1 61 2157A O ring Fluoroelast 007 20 1 61 9282A O ring Fluoroelast 011 Item Qty P N Description 21 1 61 6324 Gas Ballast Assembly 22 3 62 0270 Screw Socket Hd M6x20 23 1 66 0200 O ring Fluoroelast 216 24 1 61 6323 Intake Fitting Assembly 25 1 61 6360 Top Cover 26 2 62 0331 Screw Socket Hd M8x20 Blk 27 1 61 6038 Coupling Rubber 28 1 61...

Page 34: ...41 0643 GASKET 60 1 61 5348 INTAKE ADAPTER ASSEMBLY 18 1 61 9539B END PLATE 62 1 66 0200 O RING FLUOROELAST 216 21 1 61 8104A SHAFT SEAL HOUSING 64 4 62 1071 LOCK WASHER 1 4 SMALL 22 1 61 9935 ISO OPERATOR ASSEMBLY 65 2 41 3072 FLANGE COUPLING 23 5 2 00 2604 SCREW FILLISTER HD 8 32x1 4 66 4 2 01 6516 SCREW SOCKET HD 3 8 16x1 24 1 62 0274 ORIFICE 014 67 1 61 5246 MOTOR ADAPTER PLATE 25 1 41 3175 GA...

Page 35: ...USING 63 4 62 1071 LOCK WASHER 1 4 SMALL 23 5 2 00 2604 SCREW FILLISTER HD 8 32x1 4 64 2 41 3072 FLANGE COUPLING 24 1 62 0274 ORIFICE 014 65 4 2 01 6516 SCREW SOCKET HD 3 8 16x1 25 1 41 3175 GASKET NYLON 66 1 61 5246 MOTOR ADAPTER PLATE 30 1 61 9379 O RING FLUOROELAST 139 67 1 61 6011 HANDLE 31 1 61 5307 EXHAUST STAGE 68 6 2 01 6316 SCREW SOCKET HD 5 16 18x1 33 1 61 2118A VALVE GAS BALLAST 69 6 41...

Page 36: ...36 10 40 Exploded Views and Parts List for Pump Module 61 6168 ...

Page 37: ...37 10 41 Exploded Views and Parts List for Pump Module 61 6435 ...

Page 38: ...10 42 Exploded Views and Parts List for Pump Module 61 6354 38 ...

Page 39: ...8 32 x 3 8 70 1 61 6009 WINDOW HOLDER 71 1 61 6027 WINDOW GLASS 72 1 66 0305 O RING FLUOROELAST 130 73 1 61 2278 DRAIN VALVE 74 1 61 6442 OIL CASE 75 1 62 0212 O RING FLUOROELAST 119 77 1 61 6020 OIL FILL PLUG A MAJOR REPAIR KIT CAT N A B MINOR REPAIR KIT CAT N A 67 1637 Rev 02 06 04 PARTS LIST FOR OIL CASE 61 6443 39 ...

Page 40: ... will be repaired under this warranty rather than replaced The warranty is effective for one year from the date of original purchase when 1 The warranty card has been completed and returned 2 The product is returned to the factory or other designated service centers freight prepaid 3 The product in our judgment is defective through no action or fault of the user If the product has become defective...

Page 41: ... Ave Skokie IL 60077 Date Prepared February 10 2004 Telephone Number for General Information 847 676 8800 SECTION 2 HAZARDOUS INGREDIENTS IDENTITY Exposure Limits in Air Component CAS No OSHA PEL ACGIH TVL Synthetic Hydrocarbon 64742 65 0 NO NO To the best of our knowledge the above listed component is not hazardous according to OSHA 1910 1200 or one or more state right to know lists SECTION 3 PHY...

Page 42: ...under normal conditions Hazardous Polymerization Will not occur Conditions to Avoid None known at this time Incompatibility Materials to Avoid May react with strong oxidizing agents such as Chlorates Nitrates Peroxides etc Hazardous Decomposition Products Carbon Monoxide and other unidentified organic compounds may be formed upon combustion SECTION 6 HEALTH HAZARD DATA Eyes This substance is not e...

Page 43: ... to high temperature should be minimized Water contamination should be avoided Steps to be taken in Case of Release or Spill Stop source of leak Clean up as soon as possible Contain liquid to prevent further soil surface water or ground water contamination Clean up small spills using appropriate techniques such as Sorbing materials or pumping Where feasible and appropriate remove contaminated soil...

Page 44: ...um and petroleum fractions are excluded from the list of CERCLA hazardous substances by Section 101 14 of CERCLA Federal Regulations Reported in TSCA Inventory Product Yes Components Not Applicable Information given herein is offered in good faith as accurate but without guarantee Conditions of use and suitability of product for particular uses are beyond our control all risks of use of the produc...

Page 45: ...__________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ _________________________________...

Page 46: ...air Facility 5621 W Howard Street Niles IL 60714 Phone 847 676 8800 Fax 847 677 8606 Technical Support 847 588 2366 E Mail gdwelchvacuum gardnerdenver com Web Page www welchvacuum com This document contains confidential and trade secret information which is the property of Welch Vacuum Technology and receipt or possession does not convey any rights to loan sell or otherwise disclose said informati...

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