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Interpump General Pump MF Series Repair Manual

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MF
Repair Manual
MF45 - MF50 - MF55
General Pump is a
Ref 310068 Rev.B
member of the
02-20
Interpump Group

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Summary of Contents for Interpump General Pump MF Series

  • Page 1 Repair Manual MF45 - MF50 - MF55 General Pump is a Ref 310068 Rev.B member of the 02-20 Interpump Group...

  • Page 2: Table Of Contents

    MF SERIES GENERAL PUMP A member of the Interpump Group INDEX INTRODUCTION ..........Page 3 REPAIR INSTRUCTIONS .

  • Page 3: Introduction

    MF SERIES GENERAL PUMP A member of the Interpump Group 1. INTRODUCTION This manual describes the instructions for Repairing MF 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

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.1.1 Disassembly of Mechanical Parts The correct sequence is the following: Completely drain the oil from the pump, then disassemble the casing cover (and relative o-ring), unscrewing the 6 M10 screws (1, fig. 2).
  • Page 5 MF SERIES GENERAL PUMP A member of the Interpump Group Position the 3 grub screws or M8 threaded screws (1, fig. 5) with the function of extractors in the holes and two sufficiently long M10 screws with the function of supporting the cover (2, fig. 5).
  • Page 6 MF SERIES GENERAL PUMP A member of the Interpump Group Separate the pinion from the cover, working with an extractor hammer on the pinion itself (1, fig. 8). Remove the retaining ring Ø55 (1, fig. 9) and the bearing support ring (1, fig. 10) from the pinion.
  • Page 7 MF SERIES GENERAL PUMP A member of the Interpump Group Unscrew the screws holding in the ring gear (1, fig. 12) and remove it (1, fig. 13). Remove the ring gear (1, fig. 14). Where necessary, it is possible to utilize an extractor hammer to be applied on the 2 M8 holes (2, fig.
  • Page 8 MF SERIES GENERAL PUMP A member of the Interpump Group Remove the ring gear support ring (1, fig. 16). Unscrew the connecting rod screws (1, fig. 17). Remove the connecting rod caps with the lower semi-bearings, taking special care of the disassembly sequence during disassembly.
  • Page 9 MF SERIES GENERAL PUMP A member of the Interpump Group Advance the half supports completely in the direction of the pump head to allow the crankshaft to come out. To facilitate this operation, use special tool (p/n F27566200) (1, fig. 19).
  • Page 10 MF SERIES GENERAL PUMP A member of the Interpump Group Position the 3 grub screws or M8 threaded screws (1, fig. 23) with the function of extractors in the holes and two sufficiently long M10 screws with the function of supporting the reduction gear box (2, fig. 23).
  • Page 11 MF SERIES GENERAL PUMP A member of the Interpump Group Position the 3 grub screws or M8 threaded screws (1, fig. 28) with the function of extractors in the holes. Slowly screw in the 3 M8 screws (1, fig. 29) to prevent the cover from tilting too far and getting locked in the housing.
  • Page 12 MF SERIES GENERAL PUMP A member of the Interpump Group In the event that it is necessary to replace one or more con-rods or plunger guides, operate as follows: Unscrew the screws with tool #F27566200 to unlock the con-rods (1, fig. 32) and then extract the con-rod plunger guide units from the back casing opening (1, fig.
  • Page 13 MF SERIES GENERAL PUMP A member of the Interpump Group Extract the seal ring using the tool extractor hammer (1, fig. 36). Remove the two spindle locking retaining rings Ø120 (1, fig. 37). Remove the spindle (1, fig. 38 and extract the con-rod (1, fig. 39).
  • Page 14 MF SERIES GENERAL PUMP A member of the Interpump Group Couple the half supports to the previously disassembled caps, referring to the numbering (1, fig. 40). To separate the rod from the piston guide, unscrew the round head M6 screws (1, fig. 41) Ref 310068 Rev.B...

  • Page 15: Assembly Of Mechanical Parts

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.1.2 Assembly of Mechanical Parts Proceed with assembly following the reverse order indicated in point 2.1.1. The proper sequence is as follows: Assemble the rod to the plunger guide. Insert the piston guide rod into its seat on the piston guide (1, fig. 42) and join the rod to the piston guide by means of M6 x 20 screws (1, fig.
  • Page 16 MF SERIES GENERAL PUMP A member of the Interpump Group Block the three units with the use of special tool #F27566200 (1, fig. 32). Pre-assemble the ring inside the crankshaft bearings (on both sides of the shaft down as far as possible) using special tool #F27604700 (1, fig.
  • Page 17 MF SERIES GENERAL PUMP A member of the Interpump Group Fully insert the shaft in the casing (1, fig. 48 and fig. 49). Pre-assemble the outer ring of the pinion bearing on the reduction gear with the aid of special tool #F27604900 (1, fig.
  • Page 18 MF SERIES GENERAL PUMP A member of the Interpump Group Repeat this operation on the bearing cover, pre-assembling the external crankshaft bearing ring with the help of special tool #F27605000 (1, fig. 54), inserting fully down to end stroke (1, fig. 55).
  • Page 19 MF SERIES GENERAL PUMP A member of the Interpump Group Tighten the 8 M10 x 30 screws (1, fig. 59). Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration”. From the opposite side, insert the side seal on the reduction gear box (1, fig. 60) and lift the crankshaft to favor cover insertion (1, fig.
  • Page 20 MF SERIES GENERAL PUMP A member of the Interpump Group Tighten the 8 M10 x 40 screws (1, fig. 63). Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration”. Remove the tool for blocking the con-rods #F27566200 (1, fig. 32). Insert the upper half-bearings between the con-rods and the shaft (1, fig.
  • Page 21 MF SERIES GENERAL PUMP A member of the Interpump Group After finishing this operation, verify that the con-rods have axial clearance in both directions. Insert the piston guide seal rings in their casing housing by means of a special tool #F27605300 (1, fig.
  • Page 22 MF SERIES GENERAL PUMP A member of the Interpump Group Take care to fully and properly insert the O-ring in its housing on the cover to prevent damage during screw tightening. Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration”.
  • Page 23 MF SERIES GENERAL PUMP A member of the Interpump Group Fasten the ring gear stop (1, fig. 76) using 2 M10 x 25 screws. Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration” (1, fig. 77).
  • Page 24 MF SERIES GENERAL PUMP A member of the Interpump Group From the other side of the pinion, pre-assemble the bearing 55 x 120 x 29 (1, fig. 81) positioning it to end stroke using tool #F27604800 (1, fig. 82). Insert the bearing support ring (1, fig. 83) and position the retaining ring Ø55 (1, fig. 84).
  • Page 25 MF SERIES GENERAL PUMP A member of the Interpump Group Insert the retaining ring Ø120 in the housing (1, fig. 86). Assemble the reduction gear cover with the aid of an extractor hammer (1, fig. 87) and fasten them with 7 M10 x 40 screws (1, fig.
  • Page 26 MF SERIES GENERAL PUMP A member of the Interpump Group To prevent damage to the seal ring, take special care when inserting the seal ring on the pinion. Apply O-rings on the inspection covers (1, fig. 91) and tighten with 2+2 M16 x 14 screws (1, fig. 92).

  • Page 27: Increase And Reduction Classes

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.1.3 Increase and Reduction Classes TABLE OF REDUCTIONS FOR CRANKSHAFTS AND CON-ROD HALF-BEARINGS Correction on the shaft pin Recovery classes Half-bearing Half-bearing diameter (mm) Upper Lower (mm) 0.25 F90928100 F90928400 Ø79.75 0/0.02 Ra 0.4 Rt 3.5...
  • Page 28 MF SERIES GENERAL PUMP A member of the Interpump Group Extract the outer valve unit with the use of an extractor hammer (#F27516400) to be applied on the M10 hole of the valve guide (1, fig. 96). Unscrew the 6 M16 x 25 screws of the suction valve cover (1, fig. 97) and then undo the 6 M16 x 200 screws.
  • Page 29 MF SERIES GENERAL PUMP A member of the Interpump Group Extract the suction valve unit with the use of a slap hammer(#27516400) to be applied on the M10 hole of the valve guide (1, fig. 100). Unscrew the valve opening device by means of a 30 mm spanner (1, fig. 101) Remove the suction and outlet valve inserts, inserting and tightening an M10 screw in such a way to press on the inner guide and remove the valve guide from the valve housing (1, fig.

  • Page 30: Disassembling Manifold Mf45, Mf50, Mf55: Sleeves Containg Seals

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.2.2 Disassembling manifold MF45, MF50, MF55: sleeves containing seals Remove the sleeves containing the seals from the manifold using a slap hammer (#27929400) to be fitted to the M16 hole on the end of the sleeves (1, fig. 103).
  • Page 31 MF SERIES GENERAL PUMP A member of the Interpump Group Complete disassembly by removing the G1/2” plugs on the lower part of the manifold (1, fig. 107). It is now possible to remove the manifold from the pump casting, unscrewing the 2 M16 x 180 screws (1, fig.

  • Page 32: Fitting The Manifold

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.2.3 Fitting the manifold Insert the O-rings into the pump casing (1, fig. 110). Fit the 3 manifold locating bushes (1, fig. 111). Fit the 6 front O-ring in the pump casing (1, fig. 112).

  • Page 33: Fitting The Manifold: Sleeves Containing Seals

    MF SERIES GENERAL PUMP A member of the Interpump Group Assemble the manifold to the pump casing (1, fig. 113) taking care not to strike the pistons and screw in the 2 M16 x 180 screws (1, fig. 114) with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration”.
  • Page 34 MF SERIES GENERAL PUMP A member of the Interpump Group Fit the head ring (1, fig. 117), the high pressure seal (1, fig. 118) the restop ring (1, fig. 119) and the center ring (1, fig. 120). Fit the O-rings (1, fig. 121) and the associated back-up rings into the sleeve (2, fig. 121).
  • Page 35 MF SERIES GENERAL PUMP A member of the Interpump Group Assemble the bottom ring to the sleeve (1, fig. 122). Insert into the manifold the 3 inserts containing the seals (1, fig. 123) and position the O-rings on the front of the insert (1, fig.

  • Page 36: Assembling The Valve Units Manifold

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.2.5 Assembling the valve units manifold Pay particular attention to the conditions of the various components and replace if nes- sary. At every valve inspection, replace all O-rings both in the valve inserts and in the valve plugs.
  • Page 37 MF SERIES GENERAL PUMP A member of the Interpump Group Proceed with insertion of the valve units (suction and outlet) in the manifold, taking care to follow the correct insertion sequence of O-rings and back-up rings. The proper sequence of valve inserts in the manifold is as follows: Fit the back-up ring in the suction housing, exploded view (1, fig.
  • Page 38 MF SERIES GENERAL PUMP A member of the Interpump Group Fit the suction valve insert. The complete valve must be driven fully home and appear as showen in (1, fig. 131). Fit the O-rings (1, fig. 132) and the associated back-up rings into the valve plug (2, fin. 132).
  • Page 39 MF SERIES GENERAL PUMP A member of the Interpump Group After having completed assembly of the suction valve units and the sleeves containing the seals, fit the suction valves cover (1, fig. 134) and screw in the 6 M16 x 45 screws (1, fig. 135) as indicated in paragraph 3 “Screw Tightening Calibration”.
  • Page 40 MF SERIES GENERAL PUMP A member of the Interpump Group Ensure that the O-ring and back-up are perfectly lodged in their seats. Insert the outlet valve unit (1, fig. 138). The complete valve insert must be driven fully home and should appear as shown in (1, fig. 139).
  • Page 41 MF SERIES GENERAL PUMP A member of the Interpump Group After having completed assembly of the outlet valve units, fit the outlet valve cover (1, fig. 141) and screw in the 8 M16 x 45 screws (1, fig. 142) as indicated in paragraph 3 “Screw Tightening Calibration”.
  • Page 42 MF SERIES GENERAL PUMP A member of the Interpump Group Fit the valve lifters (1, fig. 144) and screw them in using a 30 mm wrench (1, fig. 145). Apply the G1/2” plugs on the lower part of the manifold with associated washers.

  • Page 43: Disassembling The Piston Unit

    MF SERIES GENERAL PUMP A member of the Interpump Group 2.2.6 Dismantling the piston unit The pistion unit requires preventive checks as indicated in the preventive maintenance table in the use and maintenance manual. Maintenance in limited to visual inspection of any drainage from the hole present on the lower inspection cover.

  • Page 44: Assembling The Piston Unit

    MF SERIES GENERAL PUMP A member of the Interpump Group After removing the 3 manifold locating bushes. Remove the seal support bottom O-rings (1, fig. 148). Remove the spray rings from the piston guide (1, fig. 149). 2.2.7 Assembling the piston unit Proceed with reassembly followint the reverse order indicated in par.2.2.6.
  • Page 45 MF SERIES GENERAL PUMP A member of the Interpump Group Insert the Ø10 x 18 x 0.9 washer in the fixing screw (1, fig. 151). Install the piston on their respective guides (1, fig. 152) and fasten them as per (1, fig. 153).
  • Page 46 MF SERIES GENERAL PUMP A member of the Interpump Group Insert the O-ring on the inspection covers (1, fig. 154) and assemble the covers with the use of 2+2 M6 x 14 screws (1, fig. 155). Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration”.

  • Page 47: Screw Calibration

    MF SERIES GENERAL PUMP A member of the Interpump Group 3. SCREW CALIBRATION Screws are to be fastened exclusively using a torque wrench. Exploded View Position Description Fastening Ft. (From Owner’s Manual) Fastening Nm Lbs. Casing cover screw M10 x 30 33.2...

  • Page 48: Replacing The Con-Rod Small End Bush

    MF SERIES GENERAL PUMP A member of the Interpump Group 5. REPLACING THE CON-ROD SMALL END BUSH Preform cold-driving of the bushing and the subsequent work bearing in mind that diamensions and tolerances shown in fig. 156 below. Ref 310068 Rev.B...

  • Page 49: Maintenance Log

    MF SERIES GENERAL PUMP A member of the Interpump Group 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 310068 Rev.B www.generalpump.com email: sales@gpcompanies.com...

This manual is also suitable for:

General pump mf45General pump mf50General pump mf55General pump mf55aGeneral pump mf50aGeneral pump mf45a

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