ACDE OM‐00588-04 June 12, 2006 Rev. C 01‐30‐14 INSTALLATION, OPERATION, AND MAINTENANCE MANUAL WITH PARTS LIST 10 SERIES PUMP MODEL 12B20-B THE GORMAN‐RUPP COMPANY D MANSFIELD, OHIO www.grpumps.com GORMAN‐RUPP OF CANADA LIMITED D ST. THOMAS, ONTARIO, CANADA e2006 The Gorman‐Rupp Company Printed in U.S.A.
Register your new Gorman‐Rupp pump online at www.grpumps.com/register. Valid serial number and e‐mail address required. RECORD YOUR PUMP MODEL AND SERIAL NUMBER Please record your pump model and serial number in the spaces provided below. Your Gorman‐Rupp distributor needs this information when you require parts or service.
TABLE OF CONTENTS INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE I - 1 SAFETY ‐ SECTION A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE A - 1 INSTALLATION - SECTION B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE B - 1 Pump Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS (continued) TROUBLESHOOTING - SECTION D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PUMP MAINTENANCE AND REPAIR ‐ SECTION E . . . . . . . . . . . . . . . . . STANDARD PERFORMANCE CURVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PARTS LIST: Pump Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 SERIES OM-00588 INTRODUCTION Thank You for purchasing a Gorman‐Rupp pump. Read this manual carefully to learn how to safely install and operate your pump. Failure to do so could result in personal injury or damage to the pump. This pump is a 10 Series, semi‐open impeller, self‐ priming centrifugal model with a suction check valve. The pump is designed for handling most non‐volatile, non‐flammable liquids containing specified entrained solids.
10 SERIES OM-00588 SAFETY ‐ SECTION A This information applies to 10 Series ba sic pumps. Gorman‐Rupp has no con trol over or particular knowledge of the power source which will be used. Refer to the manual accompanying the power source before attempting to begin oper ation. 6. Vent the pump slowly and cau tiously. 7. Drain the pump.
OM-00588 Do not operate the pump without shields and/or guards in place over the drive shafts, belts, and/or couplings, or other rotating parts. Exposed rotating parts can catch clothing, fingers, or tools, causing severe injury to person nel. Do not operate the pump against a closed discharge valve for long periods of time.
10 SERIES OM-00588 INSTALLATION - SECTION B Review all SAFETY information in Section A. Since pump installations are seldom identical, this section offers only general recommendations and practices required to inspect, position, and ar range the pump and piping. specific application.
OM-00588 PREINSTALLATION INSPECTION The pump assembly was inspected and tested be fore shipment from the factory. Before installation, inspect the pump for damage which may have oc curred during shipment. Check as follows: a. Inspect the pump for cracks, dents, damaged threads, and other obvious damage. b. Check for and tighten loose attaching hard ware. Since gaskets tend to shrink after dry ing, check for loose hardware at mating sur faces. c.
SERIES SUCTION AND DISCHARGE PIPING Pump performance is adversely effected by in creased suction lift, discharge elevation, and fric tion losses. See the performance curve on Page E‐1 to be sure your overall application allows pump to operate within the safe operation range. Materials Either pipe or hose maybe used for suction and discharge lines; however, the materials must be compatible with the liquid being pumped.
OM-00588 Suction Lines In Sumps If a single suction line is installed in a sump, it should be positioned away from the wall of the sump at a distance equal to 1‐1/2 times the diame ter of the suction line. If there is a liquid flow from an open pipe into the sump, the flow should be kept away from the suc tion inlet because the inflow will carry air down into the sump, and air entering the suction line will re duce pump efficiency.
10 SERIES DISCHARGE LINES Siphoning Do not terminate the discharge line at a level lower than that of the liquid being pumped unless a si phon breaker is used in the line. Otherwise, a si phoning action causing damage to the pump could result. Valves If a throttling valve is desired in the discharge line, use a valve as large as the largest pipe to minimize friction losses. Never install a throttling valve in a suction line.
OM-00588 Except in certain specific applications (to prevent flooding during service of an auto matic air release valve in a below‐ground lift station), if a manual shut‐off valve is in stalled anywhere in a bypass line, it must be a full‐opening, ball‐type valve to pre vent plugging by solids. A manual shut‐off valve should not be installed in any bypass line. A manual shut‐off valve may inadvertently be left closed during operation.
10 SERIES OM-00588 DISCHARGE PIPE CLEAN‐OUT COVER INSTALL AIR RELEASE VALVE IN HORIZONTAL POSITION 90_ LONG RADIUS ELBOW SUPPORT BRACKET BLEED LINE 1” (25,4 MM) DIA. MIN. (CUSTOMER FUR NISHED) DO NOT EX TEND BELOW PUMP OFF LIQUID LEVEL DISCHARGE CHECK VALVE PUMP DISCHARGE SELF‐PRIMING CENTRIFUGAL PUMP SUCTION LINE WET WELL OR SUMP Figure 3. Typical Automatic Air Release Valve Installation Connect the valve outlet to a bleed line which slopes back to the wet well or sump.
OM-00588 10 SERIES When checking alignment, disconnect the power source to ensure that the pump will remain inoperative. Adjusting the alignment in one direction may alter the alignment in another direc tion. Check each procedure after altering alignment. Coupled Drives When using couplings, the axis of the power source must be aligned to the axis of the pump shaft in both the horizontal and vertical planes. Most couplings require a specific gap or clearance between the driving and the driven shafts.
10 SERIES excessive power loss and possible bearing failure. Select pulleys that will match the proper speed ra tio; overspeeding the pump may damage both pump and power source. OM-00588 Belt Span Deflection Do not operate the pump without the guard in place over the rotating parts. Exposed rotating parts can catch cloth ing, fingers, or tools, causing severe in jury to personnel.
OM-00588 10 SERIES Table 1. Sheave Diameter (Inches) Deflection Force (Lbs.) Table 2. Sheave Diameter (Millimeters) Deflection Force (KG.) Belt Deflection Force Cross Section A,AX B,BX Smallest Sheave Diameter Range R.P.M. Range Uncogged Hy‐T Belts & Uncogged Hy‐T Torque Team Cogged Torque‐Flex & Machined Edge torque Team Belts Used Belt Used Belt New Belt 3.0 ‐ 3.6 1000‐2500 2501‐4000 3.7 2.8 5.5 4.2 4.1 3.4 6.1 5.0 3.8 ‐ 4.8 1000‐2500 2501‐4000 4.5 3.8 6.8 5.7 5.0 4.3 7.4 6.4 5.
OM-00588 10 SERIES OPERATION - SECTION C Review all SAFETY information in Section A. Follow the instructions on all tags, labels and decals attached to the pump. This pump is designed to handle most non‐volatile, non‐flammable liquids containing specified entrained solids. Do not attempt to pump volatile, or flam mable liquids which may damage the pump or endanger personnel as a result of pump failure.
OM-00588 Consult the operating manual furnished with the pump power source before attempting to start the power source. If an electric motor is used to drive the pump, re move V‐belts, couplings, or otherwise disconnect the pump from the motor before checking motor rotation. Operate the motor independently while observing the direction of the motor shaft, or cool ing fan.
OM-00588 10 SERIES Pump Vacuum Check With the pump inoperative, install a vacuum gauge in the system, using pipe dope on the threads. Block the suction line and start the pump. At oper ating speed the pump should pull a vacuum of 20 inches (508,0 mm) or more of mercury. If it does not, check for air leaks in the seal, gasket, or dis charge valve. Open the suction line, and read the vacuum gauge with the pump primed and at operation speed. Shut off the pump.
10 SERIES OM-00588 TROUBLESHOOTING - SECTION D Review all SAFETY information in Section A. Before attempting to open or service the pump: 1. Familiarize yourself with this manual. 2. Disconnect or lock out the power source to ensure that the pump will remain inoperative. 3. Allow the pump to completely cool if overheated. 4. Check the temperature before open ing any covers, plates, or plugs. 5. Close the suction and discharge valves. 6. Vent the pump slowly and cautiously. 7. Drain the pump.
OM-00588 TROUBLE PUMP STOPS OR FAILS TO DELIVER RATED FLOW OR PRESSURE (cont.) PUMP REQUIRES TOO MUCH POWER PUMP CLOGS FREQUENTLY EXCESSIVE NOISE BEARINGS RUN TOO HOT PAGE D - 2 10 SERIES POSSIBLE CAUSE PROBABLE REMEDY Leaking or worn seal or pump gasket. Check pump vacuum. Replace leaking or worn seal or gasket. Impeller clogged. Free impeller of debris. Pump speed too slow. Check driver output; check belts or couplings for slippage. Pump running backwards.
10 SERIES OM-00588 PREVENTIVE MAINTENANCE Since pump applications are seldom identical, and pump wear is directly affected by such things as the abrasive qualities, pressure and temperature of the liquid being pumped, this section is intended only to provide general recommendations and practices for preventive maintenance. Regardless of the application however, following a routine pre ventive maintenance schedule will help assure trouble‐free performance and long life from your Gorman‐Rupp pump.
10 SERIES OM-00588 PUMP MAINTENANCE AND REPAIR ‐ SECTION E MAINTENANCE AND REPAIR OF THE WEARING PARTS OF THE PUMP WILL MAINTAIN PEAK OPERATING PERFORMANCE. STANDARD PERFORMANCE FOR PUMP MODEL 12B20-B Based on 70_F (21_C) clear water at sea level with minimum suction lift. Since pump installations are seldom identical, your performance may be dif ferent due to such factors as viscosity, specific gravity, elevation, temperature, and impeller trim.
OM-00588 10 SERIES SECTION DRAWING PARTS PAGE Figure E-1.
10 SERIES OM-00588 PARTS LIST Pump Model 12B20-B (From S/N 1340494 Up) If your pump serial number is followed by an “N”, your pump is NOT a standard production model. Contact the Gorman‐Rupp Company to verify part numbers. ITEM PART NAME NO. .1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 .29 30 31 32 .33 34 35 36 37 38 39 .
OM-00588 PUMP AND SEAL DISASSEMBLY AND REASSEMBLY Review all SAFETY information in Section A. Follow the instructions on all tags, label and de cals attached to the pump. This pump requires little service due to its rugged, minimum‐maintenance design. However, if it be comes necessary to inspect or replace the wearing parts, follow these instructions which are keyed to the sectional view (see Figure E-1) and the ac companying parts list.
10 SERIES Pump Casing Removal Death or serious personal injury and damage to the pump or components can occur if proper lifting procedures are not observed. Make certain that hoists, chains, slings or cables are in good working condition and of suffi cient capacity and that they are posi tioned so that loads will be balanced and the pump or components will not be damaged when lifting. Suction and dis charge hoses and piping must be re moved from the pump before lifting.
OM-00588 10 SERIES Position the seal plate on a flat surface with the im peller side up and press the oil seal (9) from the seal plate. Press the oil seal (16) from the bearing retainer. Re move the bearing retainer O‐ring (21) from the groove in the pedestal bore. Inspect the seal plate and replace it if cracked or badly worn. Place a block of wood against the impeller end of the shaft and tap the shaft and assembled bear ings (10 and 13) from the pedestal. Be careful not to damage the shaft.
10 SERIES OM-00588 bearings. This may scratch the balls or races and cause premature bearing fail ure. Rotate the bearings by hand to check for rough ness or binding and inspect the bearing balls. If ro tation is rough or the bearing balls are discolored, replace the bearings. The bearing tolerances provide a tight press fit onto the shaft and a snug slip fit into the pedestal. Replace the bearings, shaft, or pedestal if the proper bearing fit is not achieved.
OM-00588 10 SERIES screws positioned horizontally in line. Be careful not to damage the lip of the oil seal (16) on the shaft keyway. Press the bearing retainer into the pedes tal until it is fully seated against the outboard bear ing. Install the same thickness of bearing adjusting shims (15) as previously removed. Secure the bearing retainer and shims using the bearing re taining ring (20) and check the shaft endplay. Inspect the impeller shaft for damage.
10 SERIES OM-00588 SPRING CENTERING WASHER SEAL PLATE BELLOWS RETAINER IMPELLER SHIMS STATIONARY SEAT STATIONARY ELEMENT IMPELLER SHAFT SHAFT SLEEVE IMPELLER ROTATING ELEMENT O‐RINGS SPRING Figure E-3. Seal Assembly secure the seal plate using two capscrews and nuts (3/8-16 UNC by 1-1/2 inches long, not supplied). This seal is not designed for operation at temperatures above 160_F (71_C). Do not use at higher operating temperatures.
OM-00588 10 SERIES Impeller Installation and Adjustment Back Cover Installation Inspect the impeller, and replace it if cracked or badly worn. Install the same thickness of impeller shims (5) as previously removed and screw the im peller onto the shaft until tight. If the wear plate (34) was removed for replace ment, secure it to the back cover assembly (38) us ing the attaching hardware (35 and 36). The wear plate must be concentric to prevent binding when the back cover assembly is installed.
10 SERIES mounting feet. Install the shaft key (17) and con nect the power source. Be sure the pump and power source are securely mounted to the base. Install the suction and discharge lines and open all valves. Make certain that all piping connections are tight, properly supported and secure. Open all the valves in the suction and discharge lines. Be sure the pump and power source have been properly lubricated, see LUBRICATION.
For U.S. and International Warranty Information, Please Visit www.grpumps.com/warranty or call: U.S.: 419-755-1280 International: +1-419-755-1352 For Canadian Warranty Information, Please Visit www.grcanada.com/warranty or call: 519-631-2870 THE GORMAN‐RUPP COMPANY D MANSFIELD, OHIO GORMAN‐RUPP OF CANADA LIMITED D ST.
