Moyno® 500 Pump (Service Manual
Contents
1. approximate Elastomer Temperature Limits NBR 10 160 F EPDM 10 2109 FPM 10 240 F NBR Nitrile EPDM Ethylene Propylene Diene Terpolymer FPM Fluoroelastomer Page 2 TROUBLE SHOOTING WARNING Before making adjustments disconnect power source and thoroughly bleed pressure from system Failure to do so could result in electric shock or serious bodily harm Failure To Pump 1 Motor will not start Check power supply Voltage must be 10 of nameplate rating when motor is in locked rotor condition 2 Motor runs and thermally kicks out Check for excessive pressure Increase ventilation to motor Do not use less than 14 wire size 3 Stator torn possible excessive pressure Replace stator check pressure at discharge port 4 Flexible joint broken possible excessive pressure Replace joint check pressure at discharge port 5 Wrong rotation Rotation must be clockwise when facing pump from motor end Reverse the connections of any two line leads to the motor 6 Excessive suction lift or vacuum Pump Overloads 1 Excessive discharge pressure Check pressure at discharge port for maximum ratings given in Table 2 Fluid viscosity too high Limit fluid viscosity to 100 CP or 500 SSU Noisy Operation 1 Excessive suction lift or vacuum Maximum suction lift is 25 feet for water 2 Suction line too small Check pipe size Be sure lines are free from obstructions 32. ION KIT NUMBERS For cast iron pumps only Item Model 35651 Model 36751 No Description NBR EPDM FPM NBR EPDM FPM Kit No 311 9123 000 311 9125 000 311 9126 000 311 9060 000 311 9036 000 311 9124 000 21 e Stator 340 3505 120 340 3505 320 340 3505 520 340 3506 120 340 3506 320 340 3506 520 24 e Joint 320 1618 000 320 6508 000 320 6509 000 320 1749 000 320 6378 000 320 6515 000 69 e Seal 320 3945 000 320 6380 000 320 6510 000 320 1750 000 320 6390 000 320 6517 000 46 e Pin Motor 320 4069 005 320 4439 001 45 e Pin Rotor 320 4069 003 320 4439 002 ABRASION RESISTANT SEALS Models Elastomer 356 367 NBR 320 6505 000 320 651 1 000 EPDM 320 6506 000 320 6512 000 FPM 320 6507 000 320 6513 000 1999 by Moyno Inc Moyno is a registered trademark of Moyno Inc NBR Nitrile EPDM Ethylene Propylne Diene Terpolymer FPM Fluoroelastomer Printed in U S A
3. Pump cavitates Pump speed is 1725 rpm Viscosity of fluid should not exceed 100 CP or 500 SSU 4 Flexible joint worn Replace joint Check pressure at discharge port 5 Insufficient mounting Mount to be secure to a firm base Vibration induced noise can be reduced by using mount pads and short sections of hose on suction and discharge ports Seal Leakage 1 Leakage at startup If leakage is slight allow pump to run several hours to let faces run in 2 Persistent seal leakage Faces may be cracked from freezing or thermal shock Replace seal Pump Will Not Prime 1 Air leak on suction side Check pipe connections PUMP DISASSEMBLY WARNING Before disassembling pump disconnect power source and thoroughly bleed pressure from system Failure to do so could result in electric shock or serious bodily harm Disconnect power source 2 Remove suction and discharge piping 3 Remove screws 112 holding suction housing 2 to discharge housing 1 Remove suction housing 2 and stator 21 4 Rotor 22 can be detached from flexible joint 24 by using a punch to remove rotor pin 45 Support joint when removing pin 5 Flexible joint 24 can be removed from motor shaft by using a punch through the discharge port to remove shaft pin 46 6 Carefully slide mechanical seal 69 off motor shaft 7 Remove discharge housing 1 from motor 70 by removing screws 112A and 112C and washers 215 8 Carefully pry s
4. Section MO y NO MOYNO 500 PUMPS Page 1o0f4 j Date March 1 1 Always the Right Solution ale arc 998 SERVICE MANUAL MOYNO 500 PUMPS 300 Series Motorized 35650 35651 35652 36750 36751 and 36752 Model DESIGN FEATURES Housing Cast iron 316 SS Pump Rotor AISI 416 stainless steel ANSI 316 SS Pump Stator NBR Seal NBR Nitrile Motor Shaft Mechanical carbon ceramic Motor 3 phase 1 1 2 HP 208 230 460V for Models 35650 and 35651 2 HP 230 460V for Models 36751 and 36750 1 phase 1 1 2 HP 115 230V for Model 35652 1 phase 2 HP 115 230V for Model 36752 60 Hertz 1725 rpm totally enclosed Note Alternate elastomers available Refer to Repair Conversion Kit Numbers page 4 INSTALLATION Mounting Position Pump may be mounted in any position When mounting vertically it is necessary to keep bearings above seals to prevent possible seal leakage into bearings Pre Wetting Prior to connecting pump wet pump elements and mechanical seal by adding fluid to be pumped into suction and discharge ports Turn pump over several times in a clockwise direction to work fluid into pump elements Piping Piping to pump should be self supporting to avoid excessive strain on pump housings See Table 1 for suction and discharge port sizes of each pump model Use pipe dope or tape to facilitate disassembly and to provide seal on pipe connections Electrical Follow the wiring diagram on the motor nameplate
5. del number pump serial number part number part description and quantity Page 4 PARTS LIST Item Description Pump Model Numbers No 35650 35651 35652 36750 36751 36752 1 Discharge Housing 350 0632 007 350 0632 000 350 0632 007 340 0951 007 340 0951 000 340 0951 007 2 Suction Housing 350 0489 000 350 0280 000 350 0489 000 350 0302 007 350 0302 000 350 0302 007 21 Stator 340 3505 120 340 3506 120 22 Rotor 320 6392 015 320 6392 000 320 4431 000 330 3077 000 330 2042 000 330 3077 000 24 Flexible Joint 320 1618 000 320 1749 000 45 Rotor Pin 320 4069 003 320 4439 002 46 Motor Pin 320 4069 005 320 4439 001 69 Mechanical Seal 320 3945 000 320 1750 000 69A Seal Spacer 320 1737 000 70 Motor 330 7845 003 330 7845 000 330 8054 002 330 2802 004 300 2802 001 330 8053 004 72 Motor Support 320 4446 000 77 Slinger Ring 320 6385 000 103 Nuts 2 req 614 0010 111 3 8 16 112 Screw Hex Hd 619 1530 161 3 8 16 x 1 4 req 619 1530 161 3 8 16 x 1 6 req 112A Screw Hex Hd 4 req 619 1530 161 3 8 16 x 1 619 1550 161 1 2 13 x 1 112B Screw Hex Hd 2 req 320 6918 000 3 8 16 x 1 3 4 215 Lock Washer 623 0010 411 3 8 4 req 623 0010 411 3 8 6 req 215A _ Lock Washer 4 req 623 0010 411 3 8 623 0010 431 1 2 261 Pipe Plug 610 0120 011 1 8 NPT Recommended spare parts REPAIR CONVERS
6. eal seat out of discharge housing 1 If any part of mechanical seal 69 is worn or broken the complete assembly should be replaced Seal components are matched parts and not interchangeable 9 Remove slinger ring 77 PUMP ASSEMBLY 1 Replace slinger ring 77 2 Attach discharge housing 1 to motor 70 using lock washers 215 and body screws 112A 3 Install mechanical seal 69 using the following procedures a Clean and oil sealing faces using light oil not grease Caution Do not use oil on EPDM parts Substitute glycerin or soap and water b Oil the outer surface of seal seat and push assembly over motor shaft into the bore of the discharge housing 1 seating it firmly and squarely c After cleaning and oiling the shaft slide the seal body along the shaft until it meets the seal seat d Install seal spring and spring retainer on shaft 4 On Model 367 position seal spacer 69A on motor shaft with slots away from seal 69 5 Pin flexible joint 24 to motor shaft with shaft pin 46 using a punch through the discharge port 6 Pin rotor 22 to flexible joint using rotor pin 45 Support joint while installing pin 7 Slide stator 21 on rotor 22 carefully locating stator flange in housing groove 8 Secure stator 21 and suction housing 2 to discharge housing 1 using screws 112 4 9 Proceed as in installation instructions Page 3 When ordering parts please specify pump mo
7. or inside the terminal box for the proper connections The wiring should be direct and conform to local electrical codes Check power connections for proper voltage Voltage variations must not exceed 10 of nameplate voltage Motors do not have overload protection To prevent damage to pump pump rotation must be clockwise when facing pump from motor end OPERATION Self Priming With wetted pumping elements the pump is capable of 25 ft suction lift with pipe size equal to port size Be sure suction lines are air tight or pump will not self prime DO NOT RUN DRY Unit depends on liquid pumped for lubrication For proper lubrication flow rate should be at least 10 of rated capacity Pressure and Temperature Limits See Table 1 for maximum discharge pressure of each model Unit is suitable for service at temperatures shown in Table 2 Storage Always drain pump for extended storage periods by removing bottom drain plug To drain Model 36750 36751 and 36752 remove suction housing bolts and loosen suction housing Caution Suction pressure should never be greater than discharge pressure Table 1 Pump Data Pump Model 356 367 Suction Port NPT 1 1 2 2 Discharge Port NPT 1 1 4 1 1 4 Voltage Rating See Motor Name Plate See Motor Name Plate VAC For Voltage Ratings For Voltage Ratings Discharge Pressure psig maximum 50 50 NOTE SSU 5xCP specific gravity Table 2 Temperature Limits
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