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Summary of Contents for Interpump General Pump EV Series
- Page 1 Repair Manual EV20A, EV22A, EV25A, EV26A, EV28A General Pump is a member of the Ref 301038 Rev. A Interpump Group 07-20...
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Page 2: Table Of Contents
EV SERIES GENERAL PUMP A member of the Interpump Group INDEX INTRODUCTION ..........Page 3 REPAIR INSTRUCTIONS . -
Page 3: Introduction
EV SERIES GENERAL PUMP A member of the Interpump Group 1. INTRODUCTION This manual describes the instructions for Repairing EV Series pumps, and must be carefully read and understood before performing any repair intervention on the pump. Proper pump operation and longevity depend on the correct use and maintenance. -
Page 4: Disassembling Of Mechanical Parts
EV SERIES GENERAL PUMP A member of the Interpump Group 2.1.1 Disassembly of the mechanical part. The operations described must be performed after removing the hydraulic part, ceramic plungers and splash guards from the pump (par. 2.2.3, 2.2.4). Remove in the following order:... - Page 5 EV SERIES GENERAL PUMP A member of the Interpump Group Remove the pump shaft Complete disassembly of the connecting rods units by removing them from the pump casing and removing the piston guide pins. Remove the pump shaft seal rings using common tools.
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Page 6: Assembly Of Mechanical Parts
EV SERIES GENERAL PUMP A member of the Interpump Group 2.1.2 Assembly of mechanical parts After having checked that the casing is clean, proceed with assembly of the mechanical part as described below: Insert the piston / con-rod guide units into the pump crankcase. - Page 7 EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 9 Fasten the caps to their respective con-rod shanks by means of M8x35 screws (Fig. 10) lubricating both the underhead and the threaded shank, proceeding in two different stages: 1.
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Page 8: Disassembly / Assembly Of Bearings And Shims
EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 11 Fig. 11/a Fig. 11/b Fig. 11/c Mount the rear cover complete with the O-ring, positioning the dipstick hole upward. Insert oil in the casing as indicated in the Owner’s Manual 2.1.3 Disassembly / Assembly of bearings and shims... - Page 9 EV SERIES GENERAL PUMP A member of the Interpump Group B) Disassembly / Reassembly of the bend shaft with replacement of the bearings After removing the side covers, as described above, remove the outer ring nut on the bearings from its seat on the covers, using an appropriate extractor as shown in (Fig.
- Page 10 EV SERIES GENERAL PUMP A member of the Interpump Group Determining the shim pack: Perform the operation while the piston/con-rod guide units are assembled, the con-rod caps are disconnected and the con-rods are pushed downwards. Insert the pump shaft without tab into the casing, making sure the PTO shaft comes out of the correct side.
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Page 11: Repairing Hydraulic Parts
EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 15 Once the type and number of shims have been determined using the table, check the following: assemble the shim pack on the indicator side cover centering (Fig. 15), secure the cover to the casing, following the procedure in par. - Page 12 EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 18 The suction and outlet valve units dismantling can be carried out by levering with simple tools (Fig. 19). Fig. 19 Fig. 19 If the suction and outlet valve seats remain stuck on the head (for example scaling due...
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Page 13: Assembly Of The Head - Unit Valves
EV SERIES GENERAL PUMP A member of the Interpump Group 2.2.2 Assembly of The Head - Unit Valves Pay particular attention to the conditions of the various components and replace them if necessary, and at the intervals indicated in the “PREVENTIVE MAINTENANCE” table in chapter 11 of the Owner’s Manual. -
Page 14: Disassembly Of The Head-Seals
EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 23 Insert the suction and outlet valve units, checking that they are fully inserted in the head seat. Then apply the valve covers and calibrate the respective M12x130 + M12x45 screws (Inlet valve cover) and M12x35 (outlet valve cover) screws, for the values of the torques and tight- ening sequences follow the instructions in chapter 3. -
Page 15: Disassembly Of The Piston Unit
EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 25 Pay attention to the order of seal pack disassembly as indicated in Fig. 26 composed of: 1. Head Ring 2. HP Seal 3. Restop Ring 4. LP Seal 5. -
Page 16: Assembly Of The Head - Seals - Piston Unit
EV SERIES GENERAL PUMP A member of the Interpump Group Fig. 27 Check and verify their conditions, replace if necessary. At every disassembly, all O-rings on the piston unit must be replaced. 2.2.5 Assembly of The Head - Seals - Piston Unit To reassemble the various components, perform the operations listed above in reverse order to par. -
Page 17: Screw Calibration
EV SERIES GENERAL PUMP A member of the Interpump Group 3. SCREW TIGHTENING CALIBRATION Screw tightening must only be performed with a torque wrench. Description Exploded View No. Torque (ft lbs./Nm) Cover Fixing Screws 7.38/10 Oil Drain Plug 29.50/40 Piston Screws 14.75/20... -
Page 18: Repair Tools
EV SERIES GENERAL PUMP A member of the Interpump Group 4. REPAIR TOOLS Pump repairs can be facilitated by special tools coded as follows: For assembly phases: Code 26134600 Seal bush extØ 35; HP alternative seal ring Ø 20x35x7.5/4.5 Code 25027200 Code 26134600 Seal bush extØ... -
Page 19: Maintenance Log
EV SERIES GENERAL PUMP A member of the Interpump Group 5. MAINTENANCE LOG HOURS & DATE OIL CHANGE GREASE PACKING REPLACEMENT PLUNGER REPLACEMENT VALVE REPLACEMENT GP Companies, Inc. 1174 Northland Drive Mendota Heights, MN 55120 Phone:651.686.2199 Fax: 800.535.1745 Ref 301038 Rev. A www.generalpump.com email: sales@gpcompanies.com...
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