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General Pump SMH, Repair Manual

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General Pump SMH Repair Manual Download Page 31

Page 31

2.2.2 Assembling the Head-Liners-Valves

To reassemble the various components, reverse the operations listed previously, paying particular attention to 

the correct assembly of the spacer for liners: the hole Ø6 (seal cooling circuit) must correspond to the same 

hole for the head (with o-ring).

Heads - liners: proceed with assembly and calibration of the head fixing screws and then with 

calibration of the liner fixing screws.

For the values of the screw tightening torques and sequencing, follow the instructions contained in Section 3 

“Screw Tightening Calibration”.

2.2.3 Dismantling The Plunger Unit - Supports - Seals

The plunger unit does not require any routing maintenance. Maintenance is limited to visual inspection of 

cooling circuit drainage. If abnormalities/variations on the outlet pressure gauge or cooling circuit draining 

hose pulsing (if flexible) are detected, the seal packings will have to be checked and replaced.

Proceed as follows to extract plunger groups:

Separate the head and the spacer for the pump casing liners as indicated in point 2.2.1 (from fig. 95 to fig 

101).

Remove the inspection cover, unscrewing the 2 fixing screws (1, fig. 108).

Remove the pumps with a fork spanner (1, fig. 109) and check conditions (1, fig. 110). Replace if necessary.

GENERAL PUMP

A member of the Interpump Group

SMH SERIES

Ref 300894 Rev. B

05-22

Summary of Contents for SMH

Page 1: ...SMH Repair Manual General Pump is a member of the Interpump Group Ref 300894 Rev B 05 22 ...

Page 2: ...f Mechanical Parts Page 15 2 1 3 Increase and Reduction Classes Page 27 2 2 Repairing Hydraulic Parts Page 27 2 2 1 Dismantling the Head Liners Valves Page 27 2 2 2 Assembling the Head Liners Valves Page 31 2 2 3 Dismantling the Plunger Unit Supports Seals Page 31 2 2 4 Assembling the Plunger Unit Supports Seals Page 33 3 SCREW CALIBRATION Page 37 4 REPAIR TOOLS Page 39 5 MAINTENANCE LOG Page 40 R...

Page 3: ...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 Page 3 GENERAL PUMP A member of the Interpump Group SMH SERIES The oil must be placed in a suitable container and disposed of in special centers It absolutely must not be discarded int...

Page 4: ...ely empty the pump of oil then disassemble the casing cover and relative o ring unscrewing the 6 M10 screws 1 fig 2 Remove the tab from the PTO shaft 1 fig 3 Unscrew the reduction gear cover fixing screws 1 fig 4 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 5: ...ar cover from the pinion is possible following these steps Remove the Seeger ring Ø 120 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 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 6: ...on itself 1 fig 8 Remove the Seeger ring Ø 55 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 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 7: ...e to utilize an extractor hammer to be applied on the 2 M8 holes 2 fig 14 Remove the tab from the shaft 1 fig 15 Unscrew the screws holding in the ring gear 1 fig 12 and remove it 1 fig 13 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 8: ...ly The connecting 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 Unscrew the connecting rod screws 1 fig 17 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 9: ...tely in the direction of the hydraulic part to allow the crankshaft to come out To facilitate this operation use special too part F27566200 1 fig 19 Remove the three upper half bearings of the half supports 1 fig 20 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 10: ...event damage 1 fig 25 Unscrew the bearing cover fixing screws from the opposite side 1 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 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 11: ...haft casing from the PTO side 1 fig 31 Page 11 Slowly screw in the 3 M8 screws 1 fig 29 to prevent the cover from tilting too far and getting locked in the housing Remove the bearing cover while supporting the shaft to prevent damage 1 fig 30 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 12: ... possible to disassemble the plunger guide seal rings taking care to not damage the plunger guide sliding rod Whenever it becomes necessary to replace the plunger guide seal rings without dismantling the entire mechanical part it is possible to extract the seal rings with the use of tool part F27644300 operating as follows Insert the tool 1 fig 34 and screw it on the rod to end stroke 1 fig 35 Pag...

Page 13: ...ue rotating the pinion until the oil seal is completely removed 1 fig 36a Page 13 Remove the two spindle locking Seeger rings Ø 120 1 fig 37 GENERAL PUMP A member of the Interpump Group SMH SERIES fig 36 fig 36a fig 36b Remove the tool and remove the oil seal 1 fig 36b Ref 300894 Rev B 05 22 ...

Page 14: ...mbering 1 fig 40 Page 14 To separate the rod from the plunger guide unscrew the hexagonal head M6 screws with a wrench 1 fig 41 GENERAL PUMP A member of the Interpump Group SMH SERIES Remove the spindle 1 fig 38 and extract the connecting rod 1 fig 39 fig 41 Ref 300894 Rev B 05 22 ...

Page 15: ...nnecting rod in the plunger guide 1 fig 39 and then insert the spindle 1 fig 38 Apply the two shoulder Seeger rings 1 fig 37 Assembly has been carried out properly if the connecting rod foot plunger guide and spindle rotate freely Separate the caps from the half supports Proper coupling can be verified by the numbering on the side 1 fig 40 After having checked casing cleaning proceed with assembly...

Page 16: ...g rod shanks 1 fig 48 and 1 fig 49 Block the three units with the use of special tool part F27566200 1 fig 32 Pre assemble the ring inside the crankshaft bearings on both sides of the shaft down to the stroke using special tool part F27604700 1 fig 46 1 fig 47 The inner and outer rings of the bearings must be reassembled keeping the same coupling with which they were disassembled GENERAL PUMP A me...

Page 17: ...special tool part F27604900 1 fig 52 inserting fully down to end stroke 1 fig 53 From the opposite side of the reduction gear box pre assemble the external ring of the crankshaft bearing with the use of tool part F27605000 1 fig 54 inserting fully down to end stroke 1 fig 55 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 18: ...this operation on the bearing box preassembling the external crankshaft bearing ring with the help of special tool part F27605000 1 fig 56 inserting fully down to end stroke 1 fig 57 Page 18 Insert the side seal on the bearing cover 1 fig 58 and lift the crankshaft to favor cover insertion 1 fig 59 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 19: ...g Calibration Page 19 From the opposite side insert the side seal on the reduction gear box 1 fig 62 and lift the crankshaft to favor cover insertion 1 fig 63 Assemble the reduction gear box and related seal using an extractor hammer 1 fig 64 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 20: ...ch as indicated in Section 3 Screw Tightening Calibration Apply the lower half bearings to the caps 1 fig 68 ensuring that the half bearing reference notches are positioned in their housing on the cap 1 fig 68 Fasten the caps to the half supports by means of M10x1 5x80 screws 1 fig 69 Note the correct assembly direction of the caps Numbering must be turned upward Calibrate the screws with a torque...

Page 21: ...eans of special tool part F27605300 Position the component on the rod 1 fig 70a and strike on the tool until the seal ring is fully inserted in the housing 1 fig 70b Insert the o ring on the rear cover 1 fig 71 and assemble the cover on the casing with the aid of 6 M10x30 screws 1 fig 72 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 22: ...ing Calibration Insert the ring gear support ring in the crankshaft shank 1 fig 73 to end stroke 1 fig 74 Page 22 Apply tab 22x14x80 in the shaft housing 1 fig 75 and insert the ring gear on the shaft 1 fig 76 The ring gear must be assembled making sure that the two M8 holes to be used for extraction be turned outward of the pump 2 fig 76 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref...

Page 23: ...n 1 fig 78 Apply the two Ø 10x24 pins on the reduction gear box 1 fig 79 and insert the o ring 1 fig 80 Complete assembly of the pinion on the reduction gear cover proceeding as follows Pre assemble the inner bearing ring 40x90x23 on the pinion 1 fig 81 positioning it to end stroke GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 24: ...using tool F27604800 1 fig 83 Insert the bearing support ring 1 fig 84 and position the Seeger ring Ø 55 1 fig 85 Insert the pinion pre assembled inside its housing in the reduction gear cover with the aid of an extractor hammer 1 fig 86 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 25: ...to the lip seal to prevent griding position the ring in the second spoke as indicated in fig 91 Page 25 Insert the Seeger ring Ø 120 in the housing 1 fig 87 Assemble the reduction gear cover with the aid of an extractor hammer 1 fig 88 and fasten them with 7 M10x40 screws 1 fig 89 Take care to properly couple the two components on the bearing 40x90x23 Calibrate the screws with a torque wrench as i...

Page 26: ...ench as indicated in Section 3 Screw Tightening Calibration Insert the tab 14x9x60 on the pinion Apply plugs and lifting brackets with the use of M16x30 screws 1 fig 94 Calibrate the screws with a torque wrench as indicated in Section 3 Screw Tightening Calibration Insert oil in the casing as indicated in the Owner s Manual Section 7 4 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 30...

Page 27: ...ER GUIDE Recovery classes mm P N Plunger Guide Adjustments on the Pump Casing housing mm 1 00 F73050243 Ø71 H6 0 019 0 Ra 0 8 Rt 6 2 2 Repairing Hydraulic Parts 2 2 1 Dismantling the Head Liners Valves The head does not require periodic maintenance Operations are limited to inspection or replacement of the valves when necessary To extract the valve assemblies work as follows Unscrew the M10x140 he...

Page 28: ...o service pin screws part F27540200 1 fig 97 and then proceed to remove the remaining screws Remove the spacer for pump casing liner from the liner units 1 fig 99 Separate the head and the spacer from the pump casing liners 1 fig 98 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 29: ...se the valve springs and the flat valves 1 and 2 fig 102 as not being locked they could fall If the valve housings should become blocked on the head due to the forming of limestone or oxide they must be unblocked by inserting a special tool part F034300020 in the outlet hole GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 30: ... before replacing Extract the outlet plates 1 fig 105 and their respective guides 1 fig 107 with their springs 1 fig 106 Check their conditions replace if necessary and at the intervals necessary as indicated in Chapter 11 of the Owner s Manual Extract the valve housings and check the conditions of the various components If necessary make any replacements 1 fig 104 GENERAL PUMP A member of the Int...

Page 31: ...n 2 2 3 Dismantling The Plunger Unit Supports Seals The plunger unit does not require any routing maintenance Maintenance is limited to visual inspection of cooling circuit drainage If abnormalities variations on the outlet pressure gauge or cooling circuit draining hose pulsing if flexible are detected the seal packings will have to be checked and replaced Proceed as follows to extract plunger gr...

Page 32: ...n fig 112 and fig 112a Remove the seeger ring and the seal retainer ring as shown in fig 113 and using a special plastic pin extract the LP low pressure seal as shown in 1 fig 114 At each disassembly the low pressure seals and all the O rings must be replaced GENERAL PUMP A member of the Interpump Group SMH SERIES fig 111 fig 112 fig 112a fig 113 fig 114 Ref 300894 Rev B 05 22 ...

Page 33: ... components invert the operations described above paying attention to the sequences listed below for the fastening torque values and phases observe the instructions given in Section 3 Screw Tightening Calibration Insert the seal into the liner 1 fig 118 GENERAL PUMP A member of the Interpump Group SMH SERIES fig 115 fig 116 fig 117 At each disassembly the HP packing 4 Fig 116 must be replaced fig ...

Page 34: ...ed in the support as indicated in fig 120 and 122 Before mounting the HP seals in their housing they must be lubricated with OKS 1110 silicone grease following the steps below A The external diameter must only be slightly greased B On the internal diameter grease must be applied paying great attention to filling all the pockets between the sealing lips as shown in fig 122a GENERAL PUMP A member of...

Page 35: ...pport with the sealing lip in the piston working direction as shown in fig 126 and fig 127 slightly lubricating the external diameter with silicone grease type OKS 1110 GENERAL PUMP A member of the Interpump Group SMH SERIES fig 122 fig 122a fig 123 fig 124 fig 125 Insert the anti extrusion ring 2 fig 123 and the gasket bush 3 fig 124 arranged as shown in fig 125 Ref 300894 Rev B 05 22 ...

Page 36: ...upport unit as shown in Fig 128 and 129 replacing components pos 1 2 3 fig 130 Assemble the L P and H P seals support units liner manually screwing the screws M8x100 as indicated in Fig 131 Then proceed with calibration using a torque wrench as indicated in Section 3 Screw Tightening Calibration Ref 300894 Rev B 05 22 ...

Page 37: ...s must be tightened respecting the phases and order shown in the diagram in Fig 132 Page 37 GENERAL PUMP A member of the Interpump Group SMH SERIES Description Exploded View Position From Owner s Manual Fastening Ft Lbs Fastening Nm Casing cover M10x30 screw 79 33 2 45 G1 2x13 casing plug 81 29 5 40 Lifting bracket M16x30 screw 44 147 5 200 Reduction gear cover M10x40 screw 72 33 2 45 Ring gear st...

Page 38: ...Page 38 GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

Page 39: ...n reduction gear box F27604900 Crankshaft bearing on reduction gear box F27605000 Plunger guide oil seal F27605300 F27634400 Bearing on pinion F27604800 Pinion oil seal F27634900 F27635000 Heads Liners spacers F27540200 For Disassembly Plunger guide oil seal F27644300 Shaft connecting rod interlocking F27566200 Valve housing F34300020 Heads Liners spacer F27540200 Plunger F25047400 GENERAL PUMP A ...

Page 40: ...GER REPLACEMENT VALVE REPLACEMENT HOURS DATE GP Companies Inc 1174 Northland Drive Mendota Heights MN 55120 Phone 651 686 2199 Fax 800 535 1745 www generalpump com email sales gpcompanies com GENERAL PUMP A member of the Interpump Group SMH SERIES Ref 300894 Rev B 05 22 ...

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