Pratissoli MW Series Repair Manual
  1. Manuals
  2. Brands
  3. Pratissoli Manuals
  4. Water Pump
  5. MW Series
  6. Repair manual

Pratissoli MW Series Repair Manual

Hide thumbs Also See for MW Series:
Table of Contents

Advertisement

Quick Links

Menu
MW
MW Series
MW32 – MW36 – MW40
MW45 – MW50 – MW55
Repair
manual
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MW Series and is the answer not in the manual?

Questions and answers

Related Manuals for Pratissoli MW Series

Summary of Contents for Pratissoli MW Series

  • Page 1 Menu MW Series MW32 – MW36 – MW40 MW45 – MW50 – MW55 Repair manual...

  • Page 2: Table Of Contents

    INDEX 1. INTRODUCTION 3  2. REPAIR GUIDELINES 3    2.1 Repairing mechanical parts....................3   2.1.1 Disassembly of mechanical parts................4   2.1.2 Assembly of mechanical parts ................15   2.1.3 Increase and reduction classes ................27   2.2 Repairing hydraulic parts....................27   2.2.1 Dismantling the MW32 MW36 MW40 head – valve units ......27  ...

  • Page 3: Introduction

    1. INTRODUCTION This manual describes the instructions for repair of the MW pump family and should be carefully read and understood before any intervention on the pump. Proper pump operation and duration depend on the correct use and maintenance. Interpump Group disclaims any responsibility for damage caused by negligence or failure to observe with the standards described in this manual.

  • Page 4: Disassembly Of Mechanical Parts

    2.1.1 Disassembly of mechanical parts The proper sequence is as follows: Fully empty the oil from the pump, then disassemble the casing cover (and relative O-ring), unscrewing the 6 M10 screws (pos. , fig.2). fig. 2 Remove the tab from the PTO shaft (pos. , fig.3). fig.
  • Page 5 Position the 3 grub screws or M8 threaded screws (pos. , fig.5) with the function of extractors in the holes and two sufficiently long M10 screws with the function of supporting the cover (pos. , fig.5). fig. 5 Slowly screw in the 3 M8 screws (pos. , fig.6) with the function of extractors to fully remove the cover unit and pinion fig.
  • Page 6 Separate the pinion from the cover, working with an extractor hammer on the pinion itself (pos. , fig.8) fig. 8 Remove the Seeger ring Ø55 (pos. , fig.9) and the bearing support ring (pos. , fig.10) from the pinion fig. 9 fig.
  • Page 7 Unscrew the screws holding in the ring gear (pos. , fig.12) and remove it (pos. , fig.13). fig. 12 fig. 13 Remove the ring gear (pos. , fig.14). Where necessary, it is possible to utilise an extractor hammer to be applied on the 2 M8 holes (pos.
  • Page 8 Remove the ring gear support ring (pos. , fig.16). fig. 16 Unscrew the con-rod screws (pos. , fig.17). fig. 17 Remove the con-rod caps with the lower semi-bearings, taking special care of the disassembly sequence during disassembly. The con-rod caps and their relative half supports must be reassembled in exactly the same order and coupling with which they were disassembled.
  • Page 9 Advance the half supports completely in the direction of the hydraulic part to allow the bend shaft to come out. To facilitate this operation, use special tool (code 27566200), (pos. , fig.19). fig. 19 Remove the three upper half-bearings of the half supports (pos. , fig.20). fig.
  • Page 10 Position the 3 grub screws or M8 threaded screws (pos. , 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 (pos. , fig.23). fig. 23 Slowly screw in the 3 M8 screws (pos.
  • Page 11 Position the 3 grub screws or M8 threaded screws (pos. , fig.28) with the function of extractors in the holes fig. 28 Slowly screw in the 3 M8 screws (pos. , fig.29) to prevent that the cover can tilt too far and get locked in the housing.
  • Page 12 In the event that it is necessary to replace one or more con-rods or piston guides, operate as follows: Unscrew the screws with tool code 27566200 to unlock the con-rods (pos. , fig.32) and then extract the con-rod-piston guide units from the back casing opening (pos. , fig.33). fig.
  • Page 13 Extract the seal ring using the tool extractor hammer (pos. , fig.36). fig. 36 Remove the two spindle locking Seeger rings Ø120 (pos. , fig.37). fig. 37 Remove the spindle (pos. , fig.38) and extract the con-rod (pos. , fig.39) fig.
  • Page 14 Couple the half supports to the previously disassembled caps, referring to the numbering (pos. , fig.40). fig. 40 To separate the rod from the piston guide, unscrew the hexagonal head M10 screws with a 17 socket wrench (pos. , fig.41), blocking the rod with the 36 fork spanner. fig.

  • Page 15: Assembly Of Mechanical Parts

    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 red to the piston guide. Insert the elastic pin Ø5 in its hole on the piston guide (pos. , fig.42) and join the rod to the piston guide by means of M10x35 screws (pos.
  • Page 16 Block the three units with the use of special tool code 27566200 (pos. , fig.32). Pre-assemble the ring inside the bend shaft bearings (on both sides of the shaft down to the stroke) using special tool code 27604700 (pos. , fig.46) (pos. , fig.47). The inner and outer rings of the bearings must be reassembled keeping the same coupling with which they were disassembled fig.
  • Page 17 Fully insert the shaft in the casing (pos. , fig.50 and fig.51) fig. 50 fig. 51 Pre-assemble the outer ring of the pinion bearing on the reduction gear with the aid of special tool code 27604900 (pos. , fig.52), inserting fully down to end stroke (pos. , fig.53) fig.
  • Page 18 Insert the side seal on the bearing cover (pos. , fig.58) and lift the bend shaft to favour cover insertion (pos. , fig.59). fig. 59 fig. 58 Assemble the bearing cover (and relative seal) using an extractor hammer (pos. , fig.60) Position the bearing cover in such a way that the "Pratissoli" logo is perfectly horizontal fig. 60...
  • Page 19 Tighten the 8 M10x30 screws (pos. , fig.61). Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”. fig. 61 From the opposite side, insert the side seal on the reduction gear box (pos. , fig.62) and lift the bend shaft to favour cover insertion (pos.
  • Page 20 Tighten the 8 M10x40 screws (pos. , fig.56). Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”. fig. 65 Remove the tool for blocking the con-rods code 27566200 (pos. , fig.32). Insert the upper half-bearings between the con-rods and the shaft (pos. , fig.66). For proper assembly of the half-bearings, ensure that the reference tab on the half-bearings are positioned in their housing on the half support (pos.
  • Page 21 fig. 69 fig. 68 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 code 27605300 (pos. , fig.70). fig. 70 Insert the O-ring on the rear cover (pos.
  • Page 22 Take care to fully and properly insert the O-ring in its housing on the cover to prevent these can become damaged during screw tightening Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”. Insert the ring gear support ring in the bend shaft shank (pos. , fig.73) to end stroke (pos. , fig.74) fig.
  • Page 23 Fasten the ring gear stop (pos. , fig.77) using 2 M10x25 screws. Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration” (pos. , fig.78). fig. 78 fig. 77 Apply the two Ø10x24 pins on the reduction gear box (pos. , fig.79) and insert the O-ring (pos. , fig.80). fig.
  • Page 24 From the other side of the pinion, pre-assemble the bearing 55x120x29 (pos. , fig.82) positioning it to end stroke using tool code 27604800 (pos. , fig.83). fig. 82 fig. 83 Insert the bearing support ring (pos. , fig.84) and position the Seeger ring Ø55 (pos. , fig.85) fig.
  • Page 25 Insert the Seeger ring Ø120 in the housing (pos. , fig.87) fig. 87 Assemble the reduction gear cover with the aid of an extractor hammer (pos. , fig.88) and fasten them with 7 M10x40 screws (pos. , fig.89). Take care to properly couple the two components on the bearing 40x90x23. Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”.
  • Page 26 RING POSITION AT FIRST ASSEMBLY RING POSITION FOR SHAFT RECOVERY IF WORN fig. 90 fig. 91 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 (pos. , fig.92) and tighten with 2+2 M6x14 screws (pos. , fig.93). Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”.

  • Page 27: Increase And Reduction Classes

    2.1.3 Increase and reduction classes TABLE OF REDUCTIONS FOR BEND SHAFTS AND CON-ROD HALF-BEARINGS Code Code Correction on the shaft pin Recovery classes Half-bearing Half-bearing diameter (mm) Upper Lower (mm) 0.25 90928100 90928400 Ø79.75 0/-0.02 Ra 0.4 Rt 3.5 0.50 90928200 90928500 Ø79.50 0/-0.02 Ra 0.4 Rt 3.5...
  • Page 28 Extract the valve plug with the use of an extractor hammer to be applied on the M10 hole of the valve plug (pos. , fig.97). fig. 97 Remove the spring (pos. , fig.98). fig. 98 Extract the outlet valve unit with the use of an extractor hammer (code 27516400) to be applied on the M10 hole of the valve guide (pos.
  • Page 29 Remove the valve housing spacer ring (pos. , fig.100) fig. 100 Remove the valve guide spacer inserting a 8mm hexagon spanner in the housing and lifting it to facilitate removal (pos. , fig.101) fig. 101 Extract the suction valve unit with the use of an extractor hammer (code 27516400) to be applied on the M10 hole of the valve guide (pos.
  • Page 30 Where extraction of the suction valve unit is especially difficult (i.e. incrustations due to prolonged lack of use of the pump), use an extractor tool code 27516200 (pos. , fig.103) as indicated. fig. 103 Unscrew the valve opening device by means of a 30 mm spanner (pos. , fig.104). fig.

  • Page 31: Dismantling The Mw32 Mw36 Mw40 - Valve Units

    It is now possible to remove the head from the pump casing, unscrewing the 8 M16x180 screws (pos. , fig.106). During disassembly of the head, pay special attention not to hit the pistons (pos. , fig.107). fig. 106 fig. 107 2.2.1 Dismantling the MW32 MW36 MW40 –...
  • Page 32 Assemble the suction and outlet valve units (fig.109 and fig.110), taking care not to invert the previously disassembled springs. To facilitate insertion of the valve guide in its housing, you can use a pipe resting on the horizontal guide planes (fig.111) and use an extractor hammer acting on the whole circumference. fig.
  • Page 33 Ensure that the O-ring and anti-extrusion ring are perfectly placed in their housings. Insert the suction valve unit (pos. , fig.114) and then the spacer (pos. , fig.115). The complete valve unit must be fully inserted into the bottom and should look like the image in pos. , fig.115.
  • Page 34 Insert the outlet valve unit (pos. , fig.119). The valve unit must be fully inserted into the bottom and should look like the image in pos. , fig.120. fig. 119 fig. 120 Insert the anti-extrusion ring, explod. posit. 18 (pos. , fig.121). fig.
  • Page 35 Pay special attention to O-ring insertion in pos. , fig.123. Use a special tool code 27516000 to prevent that the O-ring can cut itself during insertion. fig. 123 Insert the valve housing ring (pos. , fig.124) and the spring (pos. , fig.125). fig.
  • Page 36 Insert the valve plug housing complete with O-ring and anti-extrusion rings. After having completed assembly of the valve units and the valve plug, apply the valve cover (pos. , fig.127) and screw in the 8 M16x55 screws (pos. , fig.128). fig.

  • Page 37: Dismantling The Mw45 Mw50 Mw55 Head - Valve Units

    Proceed with calibration of the M16x180 screws with a torque wrench as indicated in paragraph 3 "Screw tightening calibration”. Tighten the 8 M16x180 screws starting cross-wise from the 4 inner screws, to then continue with the 4 outer screws, always tightening cross-wise Calibrate the M16x55 cover screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”.
  • Page 38 Extract the outlet valve unit with the use of an extractor hammer (code 27516400) to be applied on the M10 hole of the valve guide (pos. , fig.136). fig. 136 Unscrew the 8 M16x45 screws of the suction valve cover (pos. , fig.137) and remove the cover (pos. , fig.138).
  • Page 39 Unscrew the valve opening device by means of a 30 mm spanner (pos. , fig.140). fig. 140 Remove the suction and outlet valve units, unscrewing an M10 screw in such a way to press on the inner guide and remove the valve guide from the valve housing (pos. , fig.141). fig.

  • Page 40: Assembling The Mw45 Mw50 Mw55 Head - Valve Units

    2.2.4 Assembling the MW45 MW50 MW55 head – valve units Pay particular attention to the conditions of the various components and replace if necessary. At every valve inspection, replace all OR rings and both in the valve unit and in the valve plugs. Before repositioning the valve unit, thoroughly clean and dry the relative housings on the head indicated by the arrows (pos.
  • Page 41 The proper sequence of valve unit assembly on the head is as follows: During suction, insert the anti-extrusion ring, explod. posit. 6 (pos. , fig.148). fig. 148 Insert the O-ring, explod. posit. 7 (pos. , fig.149). fig. 149 Ensure that the O-ring and anti-extrusion ring are perfectly placed in their housings. Insert the suction valve unit (pos.
  • Page 42 Insert the front O-ring in the suction valve (pos. , fig.152). fig. 152 After having completed assembly of the suction valve units, apply the suction valve cover (pos. , fig.153) and screw in the 8 M16x45 screws (pos. , fig.154). fig.
  • Page 43 Insert the O-ring, explod. posit. 24 (pos. , fig.156). fig. 156 Ensure that the O-ring and anti-extrusion ring are perfectly placed in their housings. Insert the outlet valve unit (pos. , fig.157). The complete valve unit must be fully inserted into the bottom and should look like the image in pos. , fig.158.
  • Page 44 After having completed assembly of the outlet valve units, apply the outlet valve cover (pos. , fig.160) and screw in the 8 M16x45 screws (pos. , fig.161). fig. 160 fig. 161 Apply 6 front O-rings on the pump casing (pos. , fig.162). fig.

  • Page 45: Dismantling The Piston Unit - Supports - Seals

    Tighten the 8 M16x150 screws starting cross-wise from the 4 inner screws, to then continue with the 4 outer screws, always tightening cross-wise Calibrate the M16x45 suction and outlet cover screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”.
  • Page 46 Disassemble pistons unscrewing the fixing screws (pos. , fig.167). Remove the piston from the seal support and check that its surfaces do not present any scratches, signs of wear or cavitation fig. 167 Remove the upper inspection cover, unscrewing the 2 fixing screws (pos. , fig.168). fig.
  • Page 47 Turning the shaft, have the piston guide move forward so that the buffer, moving ahead, can expel the seal support and the entire piston unit (pos. , fig.170). fig. 170 Extract the seal support unit and the buffering tool. Remove the seal support bottom O-ring should it remain inside the pump casing (pos. , fig.171). fig.

  • Page 48: Dismantling The Piston Unit - Supports - Seals

    Separate the seal support from the liner (pos. , fig.173) to access the pressure seals (pos. , fig.174). fig. 173 fig. 174 To remove the low pressure seal, use a thickness gauge or another tool which will not damage the seal support housing (pos.
  • Page 49 Insert the low pressure seal in the seal support (pos. , fig.176) paying attention to the mounting direction which requires that the sealing lip be set forward (towards the head) fig. 176 Install the head ring (pos. , fig.177), the high pressure seal (pos. , fig.178) and the restop ring (pos. , fig.179) fig.
  • Page 50 Position the spray hood in the piston guide housing (pos. , fig.181). fig. 181 Insert the Ø10x18x0.9 washer in the piston fixing screw (pos. , fig.182). fig. 182 Install the pistons on their respective guides (pos. , fig.183) and fasten them as per pos. , fig.184. fig.
  • Page 51 Insert the O-ring inside the pump casing (pos. , fig.185) and then the previously-assembled liner-seal support block (complete with the same O-ring) to end stroke (pos. , fig.186). fig. 185 fig. 186 Ensure that the liner-support block is positioned correctly down to the bottom of the housing (pos. , fig.187). fig.

  • Page 52: Screw Tightening Calibration

    Insert the O-ring on the inspection covers (pos. , fig.190) and assemble the covers with the use of 2+2 M6x14 screws (pos. , fig.191). fig. 190 fig. 191 Calibrate the screws with a torque wrench as indicated in paragraph 3 “Screw tightening calibration”. 3.

  • Page 53: Repair Tools

    4. REPAIR TOOLS Pump maintenance can be carried out with simple component disassembly and reassembly tools. The following tools are available: For assembly: Shaft (con-rod interlocking) cod. 27566200 Bearing on bend shaft cod. 27604700 Pinion bearing on reduction gear box cod.
  • Page 54 Violators will be prosecuted according to law with appropriate legal action. PRATISSOLI a brand of INTERPUMP GROUP S.P.A. 42049 S.ILARIO - REGGIO EMILIA ( ITALY ) Tel. +39 - 0522 - 904311 Fax +39 - 0522 - 904444 E-mail: info@pratissolipompe.com...

This manual is also suitable for:

Mw32Mw36Mw40Mw45Mw50Mw55

Table of Contents