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DIRECTORR® DIRECT-DRIVE VACUUM PUMP
Do not block the exhaust port. Pressure will build up with the
potential of oil case bursting with possible injury to personnel.
Pumps not recommended for filtration, aspiration or drying
Gardner Denver Welch Vacuum Technology, Inc.
5621 W. Howard Street
Niles, IL 60714
Phone: (847) 676-8800
Fax: (847) 677-8606 (Technical Support)
E-Mail: welchvacuum@gd-thomas.com
Web-Page: www.welchvacuum.com
OWNER'S MANUAL
Pumps being run continuously above 1 torr should use an
FOR
MODELS:
8905
8907
8912
8917
8920
8925
WARNING
WARNING
exhaust oil recycler.
WARNING
electrophoresis gels.
For outside of U.S. and Canada, contact your local
Gardner Denver sales office, see back page
Part No. 67-1483R2.5
Printed in USA
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Table of Contents
Troubleshooting
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Summary of Contents for Welch 8905
- Page 1 WARNING Pumps not recommended for filtration, aspiration or drying electrophoresis gels. Gardner Denver Welch Vacuum Technology, Inc. For outside of U.S. and Canada, contact your local 5621 W. Howard Street Gardner Denver sales office, see back page...
- Page 2 INSTRUCTION WARNING AND CAUTION PLEASE READ BEFORE OPERATION While reading your manual, please pay close attention to areas labeled: WARNING AND CAUTION. The description of each is found below. WARNING Warnings are given where failure to observe instruction could result in injury or death to people. CAUTION Cautions are found where failure to observe the instruction could result in damage to the equipment,...
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Page 3: Table Of Contents
Changing the voltage setting; 8907, 8912 & 8917 “A” Models 4.03 Changing the voltage setting; 8907, 8912 & 8917 “C” Models 4.04 Changing the voltage setting; 8905, 8920 & 8925 “A” Models (Includes instructions to attach solenoid valve) 4.05 Other Electrical Configurations 4.06... - Page 4 TABLE OF CONTENTS SECTION PAGE Section 06 - Maintenance 6.01 Vacuum Problems 6.02 Oil Change 6.03 Developing a Maintenance Schedule 6.04 Lip Seal / Gasket Change Section 07 - Trouble Shooting 7.01 Leak Detection Problems 7.02 Trouble Shooting Guide Section 08 - Specifications 8.01 Shaft Seal Replacement 8.02...
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Page 5: Section 01 - Installation
The exhaust connection is a 1”-20 threaded port for all Models except 8905 which is 3/4”-20. The port is located on top of the oil reservoir. See section 9.02 Exhaust Filters to find the correct filter for each pump. -
Page 6: Electric Power
1.05 Electric Power For Model 8905 Compare the pump motor rating, printed on a label on the side of the motor and on the serial number tag, to the power source, to be sure they agree in voltage, phase, and frequency. Pump installation must comply with local electrical codes which dictate appropriate protection devices such as fuses or circuit breakers. -
Page 7: Vacuum Connections
It contains a screen to collect any debris from getting into the pump. An extensive line of vacuum pump ISO fittings, hoses, traps, etc. is available from Welch to meet the requirements of most vacuum systems. For the best vacuum, use a hose clamp in conjunction with a vacuum hose to hose nipple connections. -
Page 8: Section 02 - Pump Features & Principles Of Operation
Section 2: PUMP FEATURES AND PRINCIPLES OF OPERATION 2.01 General Description All of the Welch Vacuum Pumps are two-stage, rotary-vane, oil sealed vacuum pumps. These Vacuum Pumps offer a number of features that improve performance, or protect the pump or vacuum system under specific operating conditions. -
Page 9: Principles Of Vacuum Pump Operation
2.03 Effects of Continued Pressure Reduction The quantity of gas in the vessel (6) is reduced with each evacuation cycle. The gas remaining in the vessel expands to fill the vessel and consequently with each cycle the pressure in the vessel is reduced. This is a manifestation of Boyle’s Law which states that, for a constant temperature, the volume of a body of gas is inversely proportional to its pressure;... -
Page 10: Intake Antisuckback Protection
The ultimate vacuum guarantee on Welch pumps applies only when this oil is used. Therefore, DIRECTORR® Gold Vacuum Oil is the only oil recommended for use with these pumps. -
Page 11: Unibarbtm Intake Fitting
Intake Fitting - Simplifies Small Hose Connections 2.10 UNIBARB The Unibarb intake fitting allows the user to be able to use either 7/16” or 13/16” ID hose to connect to this system. However, the choice of hose size can have a very marked difference on pumping speed. It is the best to have the largest connection I.D.(internal diameters) as possible. -
Page 12: Section 03 - Specifications
Section 3: PUMP SPECIFICATIONS 3.01 Specification Chart SPECIFICATION 8905 8920 8925 Free Air Displacement CFM (L/min) @ 60Hz 1.8 (52) 7.7 (218) 11.3 (320) (L/min) m3h @ 50Hz (43) 1.5 (182) 10.8 (266) 16.0 Normal Pumping Speed CFM (L/min) @ 60Hz 1.5 (43) - Page 13 SPECIFICATION 8907 8912 8917 Free Air Displacement CFM (L/min) @ 60Hz 2.6 (70) 3.8 (108) 6.1 (173) (L/min) m3h @ 50Hz (56) 3.68 (86) 5.37 (138) 8.63 Normal Pumping Speed CFM (L/min) @ 60Hz 2.3 (64) 3.4 (96) 5.3 (150) (L/min) m3h @ 50Hz (53) 3.2 (80) 4.78...
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Page 14: Section 04 - Motor Power Specifications / Features
Section 4: MOTOR SPECIFICATIONS, POWER / FEATURES 4.01 Motor Specification Chart Cat. No. Voltage Freq. Ph. H.P. Factory Wired for Special Feature Approval 8905A 115 / 230 115V 60Hz Standard Model 8905C-01 115 / 230 115V 60Hz 230V US Cord Plug 8905C-02 230V 50Hz European "Schuko"... -
Page 15: Changing The Voltage Setting; 8907, 8912 & 8917 "A" Models
4.02 Changing the Voltage Setting on 8907, 8912 and 8917 “A”- Models only The pumps are set for low voltage (LV) 115 volts 60 Hz. They may also be set for high voltage (HV) 230 volts 60 Hz. To change the voltage setting, see the wiring diagram below. CAUTION Make certain that the voltage setting (LV or HV) is in the correct range for your power before plugging in. -
Page 16: Changing The Voltage Setting; 8905, 8920 & 8925 "A" Models
4.04 Changing the Voltage Setting on 8905, 8920 and 8925 “A”- Models only The vacuum pump motor is factory wired to for 115 V for models which operate at 60 Hz, and 230 V for models which operate at 50 Hz. The motor wiring can easily be changed for operation at a voltage different than that set at the factory. -
Page 17: Section 05 - Operation
See Section 9: Accessories. NOTE If operating this pump for prolonged periods of time at or above 10 Torr,contact the Welch Vacuum Technical Service Department for further information and precautions. 5.03 Shutdown Procedures A few simple precautions are necessary before performing a pump shutdown. -
Page 18: Section 06 - Maintenance
Section 6: MAINTENANCE 6.01 Vacuum Problems Inability to attain sufficient vacuum in a system is usually due to leakage, contamination, or unusual outgassing. A system must be thoroughly clean and free from leaks to operate efficiently. If the system is found to be clean and leak-free, but vacuum problems still exist, the pump should be checked. A simple way to test the pump is to measure its ultimate pressure capability. -
Page 19: Oil Change
6.03 Developing a Maintenance Schedule After studying many examples of pump failure, Welch has found the most common reason is poor condition of the oil. This is why a regular maintenance schedule for the oil is critical to obtain the longest service life out of your Vacuum Pump. -
Page 20: Lip Seal / Gasket Change
6.04 Lip Seal / Gasket change Changing the Lip Seal and Gasket for 8905 When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be replaced. Before attempting replacement of the seal, the pump must be disconnected from the vacuum system and from the power outlet. - Page 21 Changing the Lip Seal and Gasket for 8907, 8912 and 8917 When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be replaced. Before attempting replacement of the seal, the pump must be disconnected from the vacuum system and from the power outlet.
- Page 22 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.
- Page 23 Changing the Lip Seal and Gasket for 8920 and 8925 When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be replaced. Before attempting replacement of the seal, the pump must be disconnected from the vacuum system and from the power outlet.
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Page 24: Section 07 - Trouble Shooting
Section 7: TROUBLE SHOOTING 7.01 Leak Detection Problems The importance of eliminating all leaks in a vacuum system is obvious when it is realized that a leak into the system, at atmospheric pressure, expands in volume by a factor of 750,000 to 10,000,000 or more. -
Page 25: Trouble Shooting Guide
7.02 Trouble Shooting Guide Condition Probable Cause Recommended Corrective Action 1. Power off. 1. Check switches and fuses. Pump 2. Coupling damaged or 2. Check coupling and set screw. will not coupling set screw loose. start 3. Room is too cold. 3. -
Page 26: Section 08 - Specifications
8925K-02 8.03 Major Factory Repair With proper care, Welch direct drive pumps will give many years of service. The basic working parts of vacuum pumps are machined to close tolerances and require assembly on fixtures, with special tools, by mechanics who are highly skilled at this work. Should major repairs involving the pump mechanism become necessary, we strongly recommend that the pump be returned to the factory, or to a Welch Vacuum Repair Center, for repair. -
Page 27: Section 09 - Accessories
8912 8917 8920 8925 Exhaust Fliter 1417 1417P-7 1417P-7 1417P-7 1417P-10 1417P-10 Replacement Element 1417L 1417R 1417R 1417R 1417G 1417G NOTE: For additional information on Accessories, Parts or Products, please consult: Welch Vacuum’s Laboratory Products Catalog Welch’s website at www.welchvacuum.com... -
Page 28: Section 10: Drawings And Speed Curve
Section 10: DRAWINGS AND SPEED CURVE 10.10 Speed Curve... -
Page 29: Dimensional Drawing
10.20 Dimensional Drawing... -
Page 30: Pump Exploded Views And Parts List
10.30 Exploded Views and Parts List for 8905A Item # Qty. Note A*) Description Item # Qty. Note A*) Description 61-2214B Wear Plate 62-1014 Screw, Flat Hd #32x3/8 61-2149B Gasket 61-2370 Window Holder 2-62-0432 Lock Washer #6 61-2229A Window Glass 61-2406 Mounting Plate 66-0304... - Page 31 10.31 Exploded Views and Parts List for 8907A Item # Qty. Description Item # Qty. Description Gas Ballast Assembly 62-0325 Screw, Socket Hd. M6x20 Blk. 61-6324 Oil Case Assembly 61-6443 62-0270 Screw, Socket Hd. M6x20 61-6354 Pump Module 66-0200 O-ring, Fluoroelast. #216 Intake Fitting Assembly 61-6385 Gasket...
- Page 32 10.32 Exploded Views and Parts List for 8912A Item # Qty. Description Item # Qty. Description Gas Ballast Assembly 62-0325 Screw, Socket Hd. M6x20 Blk. 61-6324 Oil Case Assembly 61-6443 62-0270 Screw, Socket Hd. M6x20 61-6354 Pump Module 66-0200 O-ring, Fluoroelast. #216 Intake Fitting Assembly 61-6385 Gasket...
- Page 33 10.33 Exploded Views and Parts List for 8917A Item # Qty. Description Item # Qty. Description Gas Ballast Assembly 62-0325 Screw, Socket Hd. M6x20 Blk. 61-6324 Oil Case Assembly 61-6443 62-0270 Screw, Socket Hd. M6x20 61-6354 Pump Module 66-0200 O-ring, Fluoroelast. #216 Intake Fitting Assembly 61-6385 Gasket...
- Page 34 10.34 Exploded Views and Parts List for 8920A PARTS LIST FOR MODEL 8920A ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION SCREW FLAT HD #8-32x3/8 62-1014 41-3390 LIP SEAL 3/4” WINDOW HOLDER O-RING, FLUOROELAST. #151 61-2370 61-9526 WINDOW GLASS INTAKE STAGE 61-2229A 61-9597D O-RING, FLUOROELAST.
- Page 35 10.35 Exploded Views and Parts List for 8925A PARTS LIST FOR MODEL 8925A ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION SCREW FLAT HD #8-32x3/8 61-9582A BYPASS VALVE SPRING 62-1014 WINDOW HOLDER INTAKE VALVE COVER 61-2370 61-9686 WINDOW GLASS LOCK WASHER #8 61-2229A 2-69-6108 O-RING, FLUOROELAST.
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Page 36: Module Exploded Views And Parts List
10.40 Exploded Views and Parts List for Pump Module 61-6168... - Page 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...
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Page 39: Oil Case Exploded View And Parts List
10.50 Exploded Views and Parts List for Oil Case 61-6443 PARTS LIST FOR OIL CASE 61-6443 ITEM QTY DESCRIPTION 62-1014 SCREW COUNTER SINK #8-32 x 3/8" 61-6009 WINDOW HOLDER 61-6027 WINDOW GLASS 66-0305 O-RING, FLUOROELAST. #130 61-2278 DRAIN VALVE 61-6442 OIL CASE 62-0212 O-RING, FLUOROELAST. -
Page 40: Section 11: Warranty
Gardner Denver Welch Vacuum Technology, Inc. has not been misused, abused or altered in any way causing impaired performance or rendering it inoperative. No other warranties are expressed or implied. -
Page 41: Section 12: Msds Sheet For 8995P
Severely Hydrotreated Paraffinic Oil Synonyms: DIRECTORR® 8995P Premium Vacuum Pump Oil (Improved) Formula: N/A (Product is refined naturally occurring mixture) Gardner Denver Welch Vacuum Technology, Inc. Manufacturer’s Name: Welch Rietschle Thomas 5621 W. Howard Street 7301 North Central Ave. Skokie, IL 60077... - Page 42 SECTION 4 - FIRE AND EXPLOSION HAZARDS DATA Flash Point: 475°F 245°C Method Used: Flammable Limits: Upper: N/D Lower: N/D Extinguishing Media: CO2, Dry Chemical, Foam and Water Fog. Special Fire Fighting Procedures: For fires involving this material, do not enter any enclosed or confined fire space without proper protective equipment, This may include self-contained breathing apparatus to protect against the hazardous effects of normal products of combusting and Oxygen...
- Page 43 SIGNS AND SYMPTOMS OF EXPOSURE Primary Routes of Exposure: Inhalation, skin or eye contact, and ingestion. FIRST AID MEASURES Inhalation: This material is not expected to be an immediate inhalation problem. No First Aid procedures are required. Eyes: Immediately flush eyes with plenty of cool water for 15 minutes. Remove contact lenses if worn.
- Page 44 SECTION 9 – ENVIROMENTAL DATA Section 313 – Toxic Chemicals This product does not contain toxic chemicals of Section 313 of Title III of Supervened Amendments and Reauthorization Act of 1986 (SARA) and 40 CFR Part 372. Section 311 – Hazard Catagories Not Applicable Acute (Immediate Health Hazard) Chronic (Delayed Health Hazard)
- Page 45 NOTES ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________ ______________________________________________________________________________________...
- Page 46 Welch. This document is to be returned to Welch upon request and in all events upon completion of the purpose for which it is loaned.
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