Ampco Pumps Company LF 401 Instruction & Maintenance Manual Download Page 35

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5. Pump takes too much power

•

Speed too high

•

Pumping too much liquid because required head is lower than anticipated.

•

Viscosity and / or specific gravity is higher than specified

•

Mechanical problems—binding inside seal from distortion due to piping strains, shaft bent,
impeller rubbing casing

•

Wrong direction of rotation

LF & LM SERIES PUMPS

Summary of Contents for LF 401

Page 1: ...Ampco Pumps LF LM Series Pump Instruction Maintenance Manual LF LM SERIES PUMPS ...

Page 2: ...E CHECKS 14 SEMI ANNUAL PUMP MAINTENANCE CHECKS 14 ANNUAL PUMP MAINTENANCE CHECKS 14 MOTOR LUBRICATION SCHEDULE 14 CONTIGENCY PLAN 14 PUMP INSTALLATION 15 RECEIVING PUMP LOCATION INSTALLATION AND DOUBLE FLUSH OPTION 15 PUMP OPERATION AND SHUT DOWN 16 757 AND 758 SEAL PUMPS PUMP DIAMANTLE AND SEAL REMOVAL 17 SEAL INSTALLATION AND PUMP ASSEMBLY 20 LF 401 PUMPS PUMP DISMATLE AND SEAL REMOVAL 24 ASSEM...

Page 3: ...sure flush for double seal 4 5 PSI 0 27 0 34 BAR Water Consumption flush for double seal 4 8 GPH 15 19 LPH Stationary Seal Material Silicon Carbide Rotating Seal Material Carbon Optional Material Silicon Carbide MOTOR___________________________refer to the motor s owners manual RECOMMENDED TORQUE VALUES________________________________ Impeller nut LFX pumps 90ft lbs 122N m Impeller nut LF LM pumps...

Page 4: ...4 LF LM SERIES PUMPS ...

Page 5: ...5 LF LM SERIES PUMPS ...

Page 6: ...6 EXPLODED ASSEMBLY LF LM PUMPS R00 R10 R20 R30 R40 R130 V520 V530 AND V540 WITH THE 757 SEAL LF LM SERIES PUMPS ...

Page 7: ...7 LF LM SERIES PUMPS ...

Page 8: ...8 LF LM SERIES PUMPS EXPLODED ASSEMBLY LF PUMPS V550 X051 X151 X161 WITH THE 758 SEAL ...

Page 9: ...9 LF LM SERIES PUMPS ...

Page 10: ...10 LF LM SERIES PUMPS EXPLODED ASSEMBLY LF 401 PUMPS ...

Page 11: ...11 LF LM SERIES PUMPS ...

Page 12: ...uble seal 9 Backup ring 3 Rotating double o ring 10 Seal spring 4 Stationary double o ring 11 Seal driver inner o ring 5 Stationary seal 12 Seal driver 6 Stationary seal single o ring 13 Seal driver outer o ring 7 Single rotating seal LF LM SERIES PUMPS LF LM 757 758 SEALS ...

Page 13: ...le spring 9 Single seal spring 3 Rotating double o ring 10 Single seal o ring 4 Rotating double seal 11 Seal driver 5 Stationary seal double o ring 12 Seal driver o ring 6 Stationary seal 13 Impeller nut o ring 7 Stationary seal single o ring LF LM SERIES PUMPS LF 401 SEAL ...

Page 14: ...s 8 16 hours of service per day over 120ºF 50ºC in a severe dirt abrasive dust corrosive heavy shock or vibration environment SEMI ANNUAL PUMP MAINTENANCE CHECKS 1 Mechanical seal assembly 2 Motor bearing lubrication ANNUAL PUMP MAINTENANCE CHECKS INCLUDES SEMI ANNUAL MAINTE NANCE CHECKS PLUS 3 Remove seal for inspection 4 Bearing check 5 Check of axis running clearance of impeller CONTINGENCY PLA...

Page 15: ...tilation Make sure the motor type is suitable for the environment in which it is installed Electrical installation Have a qualified electrician connect the motor using sound electrical practices Do not test run the motor with the pump dry Mechanical seals can be damaged running dry even momentarily The pump must be flooded and the flush must be connected with flushing water flowing before starting...

Page 16: ...mp can be momentarily turned on to check the motor rotation The correct rotation is counter clock wise while looking at the pump from the suction end clock wise if looking at the pump from the motor end When the rotation of the motor has been verified to be correct the pump is ready to run continu ously for service Shut down instructions Turn off power supply to the pump Close shut off valves Drai...

Page 17: ...MOVE SEAL Socket wrench for the impeller nut Torque wrench 3 8 round bar 90º o ring pick Dead blow hammer soft face 7 16 wrench 1 Disconnect electrical power to the pump motor and follow any lockout tag out procedures in place at your facility 2 Disconnect pump from the suction piping Drain all fluids from the pump 3 Loosen and remove cover wing nuts cover cover gasket and shaft guard See figure 1...

Page 18: ...he seal driver into the cas ing with index and middle finger on opposite sides of the shaft Then with your free hand remove the key 6 Pull out the seal driver You may have to use a pick to separate the rotating seal from the stationary seal figure 4 7 The rotating seal o ring and spring will come out at as a single component fig ure 5 Figure 5 Figure 4 Figure 3 LF LM SERIES PUMPS ...

Page 19: ...ush outside of the rear seal face See figure 6 9 Remove stationary seal once pushed out of its bore See figure 7 10 Remove the double ro tating seal assembly and spring if the pump has the double seal option Check the condition of the casing rotating seal stationary seal and double seal Clean and remove any foreign matter before reinstalling the seal Figure 6 Figure 7 Figure 8 LF LM SERIES PUMPS ...

Page 20: ...n serious damage if not completely destroying the pump For assembling pumps with single seals start at step number 4 TOOLS REQUIRED FOR ASSEMBLY AND SEAL INSTALLATION 1 1 4 socket wrench Torque wrench 3 8 round bar 7 16 wrench 1 Slide the rotating double spring onto the stub shaft and use the slot to maneu ver the spring behind both rotating drive pins There are two seal springs in the double seal...

Page 21: ...l spring into the seal driver The single seal spring is smaller than the rotating double spring Next insert the backup ring The backup ring may need to be pushed in Insert the single rotating seal o ring then insert the single rotat ing seal Be sure to line up the slots in the rotating seal with the pins in the seal driver 7 Install inner seal driver o ring then slide the rotating seal assembly on...

Page 22: ... 16 9 Replace the impeller impeller nut and gasket figure 17 10 Insert the 3 8 bar into the stub shaft figure 18 and torque the impeller nut to 90 ft lbs for LF X pumps and to 40 ft lbs for all other LF pumps Figure 16 Figure 18 Figure 17 LF LM SERIES PUMPS ...

Page 23: ...ft turns freely and the impeller is not rubbing either the casing or the cover replace the shaft guard and the pump is ready to be reconnected to the piping system Note Always turn the stub shaft by hand before start up making sure noth ing is rubbing inside the motor such as foreign objects or the impeller touch ing either the back inside of the casing or the cover Also never run this pump dry Se...

Page 24: ...SMANTLE PUMP AND REMOVE SEAL 1 1 4 socket wrench Torque wrench 3 8 round bar 90º o ring pick 7 16 wrench 1 Disconnect electrical power to the pump motor and follow any lockout tag out procedures in place at your fa cility 2 Disconnect pump from the suction piping Drain all flu ids from the pump 3 Loosen and remove cover wing nuts cover cover gasket and shaft guard See figure 20 4 Insert a 3 8 bar ...

Page 25: ...t with the impeller and the single seal spring Removal of the impel ler key is not necessary keep track of it if you do remove it 7 Pull out the rotating seal You may have to use a pick to separate the rotating seal from the stationary seal while taking care not to scratch or damage the sealing surfaces figure 24 Figure 24 Figure 23 Figure 22 LF LM SERIES PUMPS ...

Page 26: ...al once pushed out of its bore The double seal may also come out with the sta tionary seal if the pump has this op tion See figure 26 10 Remove the double rotating seal assembly which includes the double seal driver double spring double o ring and the double seal Check the condition of the casing impeller ro tating seal stationary seal and double seal assemblies Clean and remove any foreign matter...

Page 27: ...e cover or the casing will result in serious damage if not completely destroying the pump For assembling pumps with single seals start at step number TOOLS REQUIRED FOR ASSEMBLY AND SEAL INSTALLATION 1 1 4 socket wrench Torque wrench 3 8 round bar 7 16 wrench 1 Slide the rotating double driver onto the stub shaft the rotating double spring the rotating double o ring and then the rotating double se...

Page 28: ...nto the its bore Line up the flats on the stationary seal with the rectangular hole in the hub of the casing See figure 30 4 Install the stationary seal push ing the stationary seal into the cas ing bore 5 Make sure the stationary seal seats against the back face of the bore Figure 30 Figure 32 Figure 31 LF LM SERIES PUMPS ...

Page 29: ...e to the correct value 7 Replace the cover and check that the cover o ring is in place and not damaged Replace the cover nuts and torque to the proper values Running the pump with foreign objects in the pump or having the impeller making contact with either the cover or the casing will result in serious damage if not completely destroying the pump If the shaft turns freely and the impeller is not ...

Page 30: ...low the shaft to move toward the cover and cause damage to the pump 0 02 0 5mm Shim for LF R Pumps 0 04 1 0mm Shim for LF V Pumps 0 06 1 5mm Shim for LF X Pumps 0 08 2 0mm Shim for LF 401 Pumps 1 Loosen the socket head cap screw in the shaft collar and re tighten it just enough so the shaft is still able move along the motors axis 2 Once the shaft collar is able to slide on the motor shaft insert ...

Page 31: ...d to the correct value the shaft may move during pump operation al though the shaft cannot be moved by hand along the motors axis Torquing the shaft collar screw more than the recommended value may break the screw 4 Check the clearance between the rest of the impeller vanes With the gage behind each vane rotate the impeller a full revolution to en sure there is a minimum clearance as in figure 23 ...

Page 32: ...urns freely and the impeller is not rubbing either the casing or the cover replace the shaft guard and the pump is ready to be reconnected to the piping system Note Always turn the stub shaft by hand before start up making sure noth ing is rubbing inside the motor such as foreign objects or the impeller touch ing either the back inside of the casing or the cover Also never run this pump dry Seals ...

Page 33: ... twice the diameter of pipe Figure 43 Make sure that the NPSH available is al ways greater than the system s NPSH re quired Avoid bending piping over obstacles as this will cause the formation of an air pocket in the suction line Figure 44 Route piping under any obstructions whenever possible Figure 45 When using a reducer on the suction end the reduced centerline should not be below the suction c...

Page 34: ...or fittings completely plugged up Wrong direction of rotation 2 Not sufficient capacity Air leaks in suction pipe for shaft seal Speed too low Required discharge head too high Suction lift too high or insufficient NPSH available Impeller piping or fittings partially plugged Insufficient positive suction head for hot water or other volatile liquids Liquid viscosity too high Mechanical problems impe...

Page 35: ...id because required head is lower than anticipated Viscosity and or specific gravity is higher than specified Mechanical problems binding inside seal from distortion due to piping strains shaft bent impeller rubbing casing Wrong direction of rotation LF LM SERIES PUMPS ...

Page 36: ...36 Ampco Pumps Company 2045 W Mill Road Glendale WI 53209 1 800 737 6871 or 414 643 1852 Email ampcocs ampcopumps com Visit www ampcopumps com for more information REV TML 7 9 10 LF LM SERIES PUMPS ...

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