
OWNER’S MANUALFORDIRECTORR® DIRECT-DRIVE VACUUMPUMP MODELS:890589078912891789208925WARNINGDo not block the exhaust port. Pressure will build up with
102.07 Pump LubricationTo ensure efficient operation and proper maintenance, and to minimize noise and oil vapors, it is important to use thecorrect
12Section 3: PUMP SPECIFICATIONS3.01 Specification Chart* Partial measurement based upon the American Vacuum Society Test Procedure No. AVS 5.1-1963
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14Section 4: MOTOR POWER SPECIFICATIONS / FEATURES4.01 Motor Specification Chart.oN.taCegatloV.qerFesahP.P.HrofderiWyrotcaFerutaeFlaicepSlavorppAA509
154.02 Changing the Voltage Setting on 8907, 8912 and 8917 “A”-ModelsThe pumps are set for low voltage (LV) 115 volts 60 Hz. They may also be set fo
164.04 Changing the Voltage Setting on 8905, 8920 and 8925 “A”-ModelsThe vacuum pump motor is factory wired to for 115 V for models which operate at
17Section 5: OPERATION5.01 Starting ProcedureBefore using the pump for the first time, it is a good idea to spend a few minutes inspecting the pump
18Section 6: MAINTENANCE6.01 Vacuum ProblemsInability to attain sufficient vacuum in a system is usually due to leakage, contamination, or unusual o
19Oil Fill: Replace the oil drain plug, remove the plastic oil fill plug located on the top of the oil reservoir. Fill thepump with vacuum oil unti
2INSTRUCTIONWARNING AND CAUTIONPLEASE READ BEFORE OPERATIONWhile reading your manual, please pay close attention to areas labeled:WARNING AND CAUTION.
206.04 Lip Seal/Gasket ChangeChanging the Lip Seal and Gasket for 8905When the shaft seal in the mounting plate shows signs of excessive oil leakage
21Changing the Lip Seal and Gasket for 8907, 8912 and 8917When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be
2211. REPLACE THE LIP SEAL HOUSINGa) It is recommended that you use 3 lockwashers to secure the LIP SEAL HOUSING. Uniform tightness isimportant. Rep
23Changing the Lip Seal and Gasket for 8920 and 8925When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be repla
24Section 7: TROUBLE SHOOTING7.01 Leak DetectionThe importance of eliminating all leaks in a vacuum system is obvious when it is realized that a lea
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26Section 8: REPAIR KITS8.01 Shaft Seal ReplacementWhen the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be repl
27SECTION 9: ACCESSORIES9.01 Pump OilDirectorr® Premium Vacuum Pump Oil is the oil recommended for use with Welch Direct Drive pumps. This is theoil
28Section 10: PUMPING SPEED CURVES / DIMENSIONAL DRAWINGS10.01 Pumping Speed Curves
2910.02 Dimensional DrawingsPump ModelABCDEFGH I JKLMNOPQRS8905A 14.13 8.70 5.52 4.07 5.73 6.81 3.16 0.54 5.58 1.56 6.76 8.70 0.95 0.54 7.50 6.68 1.1
3TABLE OF CONTENTSSection 01 - Installation1.01 Unpacking1.02 Pump Mounting1.03 Pump Location / Environmental Conditions1.04 Exhaust Provisions1.05 El
10.03 Exploded Views & Parts ListPARTS LIST FOR 8905AITEM QTY P/N A* B* DESCRIPTION01 2 62-1014 Screw, Flathead, #8-32x3/802 1 61-2370 Windo
ITEM QTY P/N A* B* DESCRIPTION01 4 62-0325 Screw, Sockethead, M6x20 Blk.02 1 61-6443 Oil Case Assembly03 1 61-6354 Pump Module04 1 61-6385 Gasket
32ITEM QTY P/N A* B* DESCRIPTION01 4 62-0325 Screw, Sockethead, M6x20 Blk.02 1 61-6443 Oil Case Assembly03 1 61-6168 Pump Module04 1 66-0199 Gask
33ITEM QTY P/N A* B* DESCRIPTION01 4 62-0325 Screw, Sockethead, M6x20 Blk.02 1 61-6443 Oil Case Assembly03 1 61-6435 Pump Module04 1 61-6385 Gask
34ITEM QTY P/N A* B* DESCRIPTION01 2 62-1014 Screw, Flathead, #8-32x3/802 1 61-2370 Window Holder03 1 61-2229A Window Glass04 1 66-0304 O-Ring, F
35ITEM QTY P/N A* B* DESCRIPTION43 8 61-9280A Dowel Pin, 1/4”44 2 41-3390 Lip Seal, 3/4”45 1 61-9378 O-Ring, Fluoroelast. #15246 1 61-9572D Intak
36ITEM QTY P/N A* B* DESCRIPTION55 4 41-2996 Vane, Spring56 2 61-6050 Vane, Intake57 1 41-2732 Key Coupling58 1 61-6040 Rotor59 1 66-0203 O-Ring,
37PARTS LIST FOR 61-6435 PUMP MODULEITEM QTY P/N A* B* DESCRIPTION40 9 62-0177 Screw, Sockethead, M5x1641 9 2-62-0793 Lock Washer #1042 1 61-6318
38PARTS LIST FOR 61-6354 PUMP MODULEITEM QTY P/N A* B* DESCRIPTION40 6 62-0177 Screw, Sockethead, M5x1641 9 2-62-0793 Lock Washer #1042 1 61-6318
39ITEM QTY P/N DESCRIPTION69 2 62-1014 Screw, Countersunk, 8-32 x 3/8”70 1 61-6009 Window Holder71 1 61-6027 Window Glass72 1 66-0305 O-Ring, Fluo
4TABLE OF CONTENTSSection 06 - Maintenance 6.01 Vacuum Problems 6.02 Oil Change 6.03 Developing a Maintenance Schedule 6.04 Lip Seal / Gasket ChangeSe
40SECTION 11: WARRANTY / MATERIAL SAFETY DATA SHEETS11.01 WarrantyThis Welch Vacuum product is warranted to be free from defects in material and work
4111.02 Material Safety Data Sheet for 8995P
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46Vacuum Pump Repair Facility7301 N. Central Ave.Skokie, IL 60077Phone: (847) 676-8800 Ext. 1Fax: (847) 677-8806OWNER’S MANUALForDIRECTORR® DIRECT-D
5Section 1: INSTALLATION1.01 UnpackingCarefully remove the pump from the shipping carton. Keep all paperwork and inspection tags for future referen
61.05 Electric PowerFor Model 8905Compare the pump motor rating, printed on a label on the side of the motor and on the serial number tag, to thepowe
71.06 Vacuum ConnectionsThe pump inlet is equipped with a UNIBARB hose fitting. See table in section 3 for UNIBARB sizes and I.D. hosesneeded for eac
8Section 2: PUMP FEATURES AND PRINCIPLES OF OPERATION2.01 General DescriptionAll of the Welch Vacuum Pumps are two-stage, rotary-vane, oil sealed va
92.03 Effects of Continued Pressure ReductionThe quantity of gas in the vessel (6) is reduced with each evacuation cycle. The gas remaining in the v
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