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General Introduction The Edwards Model 20 and Model 80 pumps (Figure 1-1) are standard-duty high-speed gear-driven positive-displacement rotary pumps with gear-type rotors. The pumps are self-priming. Edwards rotary pumps are available in many configurations. While they may look alike, there may be significant differences from one pump to another. Differences include construction material, sealing method, rotor type, etc.
20-420 and the serial number is ________________. If the numbers do not match, contact Edwards - Pentair Water. Most pump repairs can be performed by maintenance personnel using normally avail- able tools.
Table 2-2. If the pump is operating at over 180°F, contact over-greased. Edwards - Pentair Water for recommended lubrication interval for your application. Excess grease will run out of the fit- Table 2-2. Lubrication Schedule ting when pump is in operation.
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Maintenance Table 2-3. Troubleshooting (Continued) Trouble Probable Cause Remedial Action 2c. Worn or damaged 2c. Repair or replace pump. bearing(s). Excessive 3a. Loose or misaligned 3a. Tighten, align, or replace vibration coupling. coupling. 3b. Cavitation. 3b. Check suction piping with a vacuum gauge.
Model 20 / Model 80 Pumps Disassembly General Practice 1. Keep work area as clean as possible to avoid contamination of internal parts. 2. Replace gaskets, packings, and seals removed during repair. Replace all keys, spring washers, and like items during assembly. 3.
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Maintenance UPPER DRIVE SUCTION DISCHARGE DISCHARGE PORT PORT PORT LEFT HAND RIGHT HAND ROTATION ROTATION LOWER DRIVE SUCTION DISCHARGE SUCTION PORT PORT PORT LEFT HAND RIGHT HAND ROTATION ROTATION 1070_0002a.cdr NOTE: ALL ROTATIONS ARE VIEWED FROM PUMP SHAFT END. Edwards USES THE FOLLOWING NOTATION FOR PUMP IDENTIFICATION: UR = UPPER SHAFT –...
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Model 20 / Model 80 Pumps 1’’ THRU 3/8’’ HOLES 5/16’’ x 1-3/4’’ NC GRADE 8 (2 PLACES) CAP SCREWS (2 PLACES) 1-5/8’’ 3/4’’ 4’’ 1-1/2’’ 1070_0003b.cdr Figure 2-2. Timing-Gear Puller Plate Fabrication Diagram 12. Remove cap screws (18), nuts (3), and washers (19) from timing gear endcase (17). 13.
Maintenance 2. After soaking parts in “dry” cleaning solvent, deposits may be washed away by flushing or spraying. Where necessary, use soft-bristled, non-metallic brush moist- ened in solvent. 3. Except for bearings, dry parts using filtered, compressed air after cleaning. 4.
Model 20 / Model 80 Pumps Assembly General Practice 1. Remove any protective coatings from new parts. 2. Lubricate bearings with same type of lubricant normally used in pump or as directed in specific repair procedure. 3. Lubricate lip of oil seals with lubricant specified in specific procedure. Install oil seals, with lip facing out, by applying an even force to outer edge of seal.
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Figure 2-4. We recommend using an arbor press to seat the seals. Installation tools are available from Edwards-Pentair Water. face toward pump body as shown in 3.
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Model 20 / Model 80 Pumps Install Endcases 1. Install new pump body gasket (21) to each side of the body (27). 2. Install large flat washer and nut (3) on one of the studs (26) on timing-gear end of pump body (27).
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Maintenance 5. Slowly tighten adjusting nut opposing adjusting nut tightened during step 4 until slight opposite dial indicator needle movement is observed. Do not overtighten. Do not overtighten bearing adjusting nut setscrews. Excessive bearing preload may result, causing bearing damage. 6.
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Model 20 / Model 80 Pumps 6. After all lash has been removed, hold idler timing gear (11) in place while seating gear by lightly tapping it with a bearing seating sleeve. 7. Apply anti-seize compound (4, Table 2-10) to timing gear locknut (9, Figure 4-1) threads and install locknut on idler shaft.
2. Check for shipment shortages against the bill of lading. 3. Report shortages to the carrier and note them on the bill of lading. 4. Notify Edwards - Pentair Water of damage to contents not a fault of the carrier, or in the event of short- ages.
Model 20 / Model 80 Pumps 3. Leave plastic or gasket-type port covers in place. 4. If pump comes wrapped with protective material, rewrap pump. 5. Store in clean, dry location. Installation The pump can be installed wherever adequate space exists to connect piping and per- form maintenance.
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Installation 13.75’’ 8.625’’ 7.25’’ 5.0’’ 3.75’’ 2.5’’ 1.75’’ 0.625’’ 4.5’’ 5.625’’ 1070_0006b.cdr Figure 3-2. Edwards Model 20 Dimensions 5.63’’ 2.81’’ 2.25’’ 2.25’’ C L PUMP C L PUMP 1.75’’ 0.87’’ 0.38’’ HOLES 1070_0007b.cdr Figure 3-3. Edwards Model 20 Mounting Bolt Locations...
Model 20 / Model 80 Pumps Prepare Foundation The foundation absorbs any vibration, strains, or shock, while providing a permanent, rigid support for the pump skid. 1. Construct a foundation form that is 4 to 6 inches longer and wider than the skid base.
Installation PUT WASTE 1/2’’ AROUND BOLT TEMPLATE BEFORE POURING CONCRETE LEAVE SURFACE ROUGH TO ANCHOR GROUT SLEEVE 5’’ 1.5’’ WASHER 1/4’’ 2’’ 3’’ 1070_0011a.cdr Figure 3-5. Typical Foundation Bolt Configuration Level Pump Skid 1. Before pump skid is set on foundation, clean underside of skid base and top of foun- dation.
Model 20 / Model 80 Pumps 3. Wet top of foundation prior to grouting. 4. Pour grout between frame and skid base. 5. Puddle grout as poured, working as much as possible under skid base and into sleeves around foundation bolts. Ideally, complete space under skid base should be filled to height of grout around skid base.
Installation 4. Start and stop the driver while observing driver shaft rotation. Driver rotation must be same as pump rotation. For applications Align Couplings where pumps are operated at elevated The alignment of the pump and motor or engine driver must be checked before startup. temperatures, final Maximum angular offset in the two coupling halves is 1 degree;...
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Model 20 / Model 80 Pumps FEELER GAUGE 1070_0014a.cdr Figure 3-8. Checking for Angular Coupling Misalignment Checking for Parallel Misalignment. To check parallel misalignment: 1. Attach dial indicator as shown in Figure 3-9. 2. With dial indicator secured to pump or driver shaft, rotate both shafts together, noting dial indicator readings through one complete revolution.
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Installation USE DIAL SECURE BRACKET INDICATOR TO COUPLING HALF FOR PARALLEL ALIGNMENT USE INSIDE MICROMETER FOR ANGULAR ALIGNMENT 1070_0016a.cdr Figure 3-10. Checking for Spacer Coupling Misalignment Piping Rotary pumps have close running clearances. Thus, clean piping is a must. Dirt, grit, weld bead or scale, flushed from an unclean piping system, will damage and may stall the pump.
Model 20 / Model 80 Pumps tem including valves, strainers, and other restrictions, and the elevation of the pump with reference to supply and discharge points. Friction or line losses may be calculated by referring to the manufacturer’s Engineering Manual or the Hydraulic Institute’s Engineering Data Book.
Installation RECOMMENDED BYPASS FLOW SUPPLY TANK PRESSURE RELIEF VALVE NOT RECOMMENDED BUSHING PIPE TEE TO SYSTEM SUCTION PORT DISCHARGE PORT ROTARY GEAR PUMP 1070_0005a.cdr Figure 3-11. Pump By-pass Piping Pre-Startup Checks Inspection checks are essential to avoid operational difficulties and ensure trouble-free startup.
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Check the name plate on the pump to make certain the model number is 20-420 and the serial number is ________________. If the numbers do not match, contact Edwards - Pentair Water. When ordering parts, please provide: 1.
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SECTION EDWARDS PAGE 4 DATED JANUARY 2008 Figure 4-1. Edwards Model 20 Pump Exploded View 1070_0008a.cdr Pentair Water...
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WARRANTY: Seller warrants equipment (and its component parts) of its own manufacture against defects in materials and workmanship under normal use and service for one (1) year from the date of installation or start-up, or for eighteen (18) months after the date of shipment, whichever occurs first.
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800 Airport Road, North Aurora, IL 60542 phone: 630-859-7000 fax: 630-859-1226 website: www.AuroraPump.com ED11005 (07/08/13)
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