GP MF Series Mode d'emploi
MF
Repair Manual
Ref 310068 Rev.A
06-17
General Pump
is a member of
the Interpump Group
8
MF45 - MF50 - MF55
GENERAL PUMP A member of the Interpump Group
INDEX
1. INTRODUCTION ..................................................Page 3
2. REPAIR INSTRUCTIONS ...........................................Page 3
2.1 Repairing Mechanical Parts .......................................Page 3
2.1.1 Disassembling of Mechanical Parts ..........................Page 4
2.1.2 Assembly of Mechanical Parts ..............................Page 15
2.1.3 Increase and Reduction Classes ............................Page 27
2.2 Repairing Hydraulic Parts ........................................Page 27
2.2.1 Disassembling manifold MF45, MF50, MF55: valve inserts........Page 27
2.2.2 Disassembling manifold MF45, MF50, MF55: sleeves containg sealsPage 30
2.2.3 Fitting the manifold .......................................Page 32
2.2.4 Fitting the manifold: sleeves containing seals ..................Page 33
2.2.5 Assembling the valve units manifold .........................Page 36
2.2.6 Disassembling the piston unit...............................Page 43
2.2.7 Assembling the piston unit .................................Page 44
3. SCREW CALIBRATION ............................................Page 47
4. REPAIR TOOLS ..................................................Page 47
5. REPLACING THE CON-ROD SMALL END BUSH .......................Page 48
6. MAINTENANCE LOG ..............................................Page 49
Ref 310068 Rev.A
06-17
MF SERIES
Page 2
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. General Pump declines any responsibility for
damage caused by the misuse or the non-observance of the instructions described in this manual.
2. REPAIR INSTRUCTIONS
2.1 Repairing Mechanical Parts
Mechanical parts repair must be performed after removal of oil from the casing. To drain
the oil, remove the oil dipstick, (1, fig. 1) and then the draining plug (2, fig. 1).
The oil must be placed in a suitable container and disposed of in special centers.
It absolutely must not be discarded into the environment.
Ref 310068 Rev.A
06-17
MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 3
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).
Remove the tab from the PTO shaft (2, fig. 3).
Unscrew the reduction gear cover fixing screws (1, fig. 4).
Ref 310068 Rev.A
06-17
MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 4
Slowly screw in the 3 M8 screws (1, fig. 6) with the function of extractors to fully remove the cover unit
and pinion.
Complete disassembly of the reduction gear cover from the pinion is possible following these steps:
Remove the retaining ring Ø120 (1, fig. 7)
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).
Ref 310068 Rev.A
07-17
GENERAL PUMP A member of the Interpump Group MF SERIES
Page 5
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.
Extract the seal ring from the reduction gear cover, working from the inner side of the cover (1, fig. 11).
Ref 310068 Rev.A
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MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 6
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. 14).
Remove the key from the shaft (1, fig. 15).
Unscrew the screws holding in the ring gear (1, fig. 12) and remove it (1, fig. 13).
Ref 310068 Rev.A
06-17
GENERAL PUMP A member of the Interpump Group MF SERIES
Page 7
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.
The con-rod caps and their relative half supports must be reassembled in exactly the same
order and coupling with which they were disassembled.
To avoid possible errors, caps and half-supports have been numbered on one side (1, fig. 18).
Page 8
Ref 310068 Rev.A
06-17
MF SERIES
GENERAL PUMP A member of the Interpump Group
Unscrew the reduction gear box fixing screws (1, fig. 21 and fig. 22).
Page 9
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).
Remove the three upper half-bearings of the half supports (1, fig. 20).
Ref 310068 Rev.A
06-17
MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 10
Slowly screw in the 3 M8 screws (1, fig. 24) to prevent the box from tilting too far and getting locking in the
housing. Remove the box while supporting the shaft to prevent damage (1, fig. 25)
Unscrew the bearing cover fixing screws from the opposite side (1, fig. 26 and fig. 27).
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).
Ref 310068 Rev.A
06-17
MF SERIES
GENERAL PUMP A member of the Interpump Group
Autres manuels pour MF Series
1
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3
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