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OWNER’S MANUAL

FOR

GEM® DIRECT-DRIVE VACUUM PUMP

MODEL 8890

7301 North Central Avenue
Skokie, Illinois 60077
Phone: (847) 676-8800
Fax: (847) 677-8606 (Technical Support)
Fax: (920) 451-4397 (Ordering)
E-Mail:[email protected]

Part No. 61-1172AR1.7

Web-Page: www.welchvacuum.com

Printed in U.S.A.

WARNING

Never Block the Exhaust Port. If the exhaust is blocked, pressure

will build-up in the pump with the potential of the pump body

bursting and causing possible injury to personnel in the area

For outside U.S. and Canada, contact your local
Rietschle Thomas sales office, see back page

Summary of Contents for 8890

Page 1: ...g E Mail welchvacuum thomasind com Part No 61 1172AR1 7 Web Page www welchvacuum com Printed in U S A WARNING Never Block the Exhaust Port If the exhaust is blocked pressure will build up in the pump with the potential of the pump body bursting and causing possible injury to personnel in the area For outside U S and Canada contact your local Rietschle Thomas sales office see back page ...

Page 2: ...where failure to observe the instruction should result in damage to the equipment associated equipment and process These units conform to the SI International system of units of measurement The following symbols with recommendations of IEC1010 of warning will be found on the pump Caution refer to accompanying documents Caution risk of electrical shock Caution hot surface WARNING Motor includes a s...

Page 3: ...ump Features and Principles of Operation 8 Section 3 Specifications 13 Section 4 Parts List and Exploded Pump View 16 Section 5 Operation 18 Section 6 Maintenance and Troubleshooting 19 Section 7 Repair Service 22 Section 8 Accessories MSDS for Directorr Premium Oil 23 ...

Page 4: ...ring or replacing shall be at the discretion of Welch Rietschle Thomas Vacuum pumps that have been operated within a vacuum system or other system for any period however short 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 fa...

Page 5: ... be filed with the carrier immediately keep the shipping container for inspection by the carrier 1 3 Pump Mounting Rubber bumpers are supplied with the pump base They isolate noise and eliminate creeping For more rigid mounting requirements the pump base can be the bumper holes to put the mounting bolts through Refer to Section 3 Specifications for mounting hold location dimensions 1 4 Pump Locati...

Page 6: ...essed by removing the four screws on the top lid of the motor junction box 1 7 Vacuum Connections The pump inlet is equipped with a hose barb nipple for connection of 3 8 in ID hose It is located next to the pump handle The choice of connections and fittings can have a very marked effect on the pumping speed at the vacuum chamber Any connection placed between the pump and the chamber creates an im...

Page 7: ...iquid being pumped Inlet and outlet connections should be make at or near the to prevent any of the trapped liquid from being drawn out by the pump To prevent condensable vapors from condensing in the vacuum pump several measures should be taken These include A Control of the pressure in the vacuum system Not all vacuum systems need to or should be operated at the lowest pressure possible for the ...

Page 8: ...n through a typical stage of a rotary vane pump Note that this figure is not intended to illustrate the internal components of a gerotor pump such as the Model 8890 its purpose is to illustrate the general operating principles of vacuum pumps The rotary action of the pump creates a hollow space or chamber 1 which expands as the pump rotates As the chamber expands the pressure in the chamber decrea...

Page 9: ...ate Pressure As described previously a quantity of gas is removed from the system with each cycle of the pump Therefore the pressure of the gas remaining in the system is reduced with each pump cycle Since the pump can remove only a small portion of the gas with each pump cycle it is obvious that this method of evacuation can never completely remove all the gas in the vessel In addition all the co...

Page 10: ... the two stages is closest to the driven end of the shaft The intake gerotor is larger in volume and its size determines the pumping rate of the pump See Figure 2 3 Gas from the system being evacuated flows into the inlet of the intake gerotor and is compressed in the gerotor chamber At the beginning of a pump down the pressure of the compressed gas is sufficient to force the bypass valve open so ...

Page 11: ...ned on the spring loaded solenoid plunger is pulled down but the isolation valve remains held against the pump intake by the pressure differential between that of the pump and chamber After a very short time the pressure of the pump equals the pressure in the chamber at which time the isolation valve drops due to its own weight opening then take of the pump to allow gas to flow into the pump again...

Page 12: ... u q s r e t i l y t i c a p a C l i O 8 4 0 5 4 0 e l p p i n d e d a e r h t T P N 4 1 n o i t c e n n o C e k a t n I b r a B e s o H 8 3 d e r i u q e R D I g n i b u T 8 3 n o i t c e n n o C t s u a h x E d e d a e r h t 0 2 4 3 g K s b l t h g i e W p m u P 1 1 1 5 4 2 n o i s n e m i D l l a r e v O m c s e h c n i L m c s e h c n i W m c s e h c n i H 8 6 3 5 4 1 0 3 1 1 5 3 1 2 4 8 g K s...

Page 13: ...13 Figure 3 1 Pumping Speed Curve Figure 3 2 Pump Down Curve of Model 8890 Vacuum Pump of Model 8890 Vacuum Pump Figure 3 3 Dimensional Drawings Model 8890 Vacuum Pump ...

Page 14: ...ican Plug Iso Valve 8890C 57 115 230 50 1 220 V Euro Plug Iso Valve Models can be easily rewired to operate at either the low 115 V or high 220 230V voltage When changing the factory wiring replace the line cord plug with one suitable for the voltage connection which meets the local electrical codes Figure 3 4 shows the electrical schematic for low voltage Figure 3 5 shows it for high voltage This...

Page 15: ...2 1 61 1119B 1 Gasket 33 1 61 1318 Mounting Plate 33 1 61 1321 Mounting Plate 34 1 61 9429 Screw 10 32x3 16 with O ring 36 1 61 2221A Intake Nipple 37 3 2 00 6708 Screw Sockethead 10 32x1 2 38 1 61 2313 Adapter Plate for Franklin Motor 38 1 61 2314 Adapter Plate for Emerson Motor 39 2 4 21 5010 Dowel Pin 3 16 x5 8 40 2 41 2693 Coupling Body 41 4 2 00 6716 Screw Sockethead 10 32x1 42 1 41 2694 1 Co...

Page 16: ...ned to be most efficient when operated at or near its ultimate blankoff pressure When operated at elevated pressures the exhaust filter provided should be used When operated at high pressures for long periods of time this filter will saturate quickly and puffs of smoke will be seen around it Replace the filter with a new one or replace with the Model 1417 Filter with replaceable cartridge See Sect...

Page 17: ...the oil and when the oil is recirculated the condensate evaporates The resulting vapor then reduces the ultimate vacuum attainable in the system Some foreign particles and vapors from sludges with the oil The presence of sludge in the oil impair its sealing and lubricating properties and eventually could cause pump seizure Therefore periodic oil changes are necessary to maintain efficient operatio...

Page 18: ... 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 from the coupling end inside the bore Seal assembly tool 61 2172A used to install it 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 over the modular assembly 9 Moisten the Li...

Page 19: ...19 TROUBLESHOOTING 6 4 Trouble Shooting Guide ...

Page 20: ...roughly evaluated and tested to determine that it meets the performance requirements 7 3 Minor Repair Kit For Model 8890 Vacuum Pumps A minor repair kit Cat No 8890K 02 is available for the Model 8890 Vacuum Pump This kit contains a group of parts that can be replaced in the field Table 7 1 lists the contents of the minor repair kit Refer to Figure 4 1 Exploded View Diagram this should be used as ...

Page 21: ...lity over long periods of time This oil can be used in mildly corrosive applications in direct drive pumps where a hydrocarbon oil is not recommended Ordering Information for DIRECTORR Gold Oil Cat No Container Size Quantity Cat No Container Size Quantity 8995G 11 1 Liter 1 Each 8995G 20 5 Gallon 1 Each 8995G 15 1 Gallon 1 Each 8995G 25 55 Gallon 1 Each Exhaust Filters One 1417 Exhaust Filter is f...

Page 22: ... Requires an ISO NW 16 to Hose Nipple Adapter Kit Cat No 1419H 16 Ordering Information for Molecular Sieve Trap Cat No Description 543001 Molecular Sieve Trap ISO NW 16 requires a sieve charge see below 543950 Synthetic Zeolite 543960 Activated Alumina Dry Ice Cold Trap A dry ice cold trap is a convenient low cost way to trap excess condensable vapors that could enter the vacuum pump Dry ice and a...

Page 23: ...0076 0183 Date Prepared January 1 2000 Telephone Number for General Information 847 676 8800 SECTION 2 HAZARDOUS INGREDIENTS IDENTITY Exposure Limits in Air Other Limits Component OSHA PEL ACGIH TVL Recommended Optional Severely Hydrotreated NO NO 100 Paraffinic Oil 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 kn...

Page 24: ...sure to smoke fumes or hazardous de composition products CAUTION DO NOT USE PRESSURE TO EMPTY DRUM AS DOING SO MAY RESULT IN AN EXPLOSION SECTION 5 PHYSICAL HAZARDS REACTIVITY DATA Stability Stable however avoid heating to decomposition The user is advised to have a safety expert evaluate the specific conditions of use Polymerization Will Not Occur Conditions to Avoid N A Materials to Avoid N D Ha...

Page 25: ... of this material user should determine if release is reportable under applicable laws and regulations under RCRA SECTION 8 CONTROL MEASURES Ventilation Normal Respiratory Protection Respirators should be selected based on the form and concentration of contaminant in the air and in accordance with OSHA 1910 134 Eye Protection Safety goggles meeting ANSI Z 87 2 Standard Protective Clothing Impervio...

Page 26: ..._____________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ __________________________________________...

Page 27: ...ntralAve Skokie IL 60077 Phone 847 676 8800 Fax 847 677 8806 OWNER S MANUAL For GEM DIRECT DRIVE VACUUM PUMP MODEL 8890 Part No 61 1172R1 7 Copyright 1993 2003Welch RietschleThomas GEM is a registered trademark ofWelch RietschleThomas 27 ...

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