VF Repair Manual
GENERAL PUMP INDEX 1. 2. 3. 4. 5. A member of the Interpump Group VF SERIES INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3 REPAIR INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 2.1 Crank Mechanism Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 2.1.1 Crank Mechanism Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL PUMP A member of the Interpump Group 1. INTRODUCTION VF SERIES This manual describes the instructions for Repairing VF Series pumps, and must be carefully read and understood before performing any repair intervention on the pump. Correct use and adequate maintenance is fundamental for the pump’s regular operation and long wear. 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.
GENERAL PUMP A member of the Interpump Group VF SERIES 2.1.1 Crank Mechanism Disassembly The correct sequence is the following A) Drain oil and then remove: • pump shaft key • connecting rod cap • side covers using 3 wholly threaded M6 x 50 screws, inserting them in the opposite holes as shown in fig. 2 B) Push the plunger guides and connecting rods forward in order to facilitate the lateral extraction of the pump shaft. Two marks are visible on the crankshaft, as shown in fig.
GENERAL PUMP A member of the Interpump Group VF SERIES 2.1.2 Crank Mechanism Assembly After cleaning the crankcase, reassemble the crankcase mechanism as follows: A) Thoroughly fit the plunger guide seals into their seat on the crankcase as shown in fig. 5a, using the appropriate tool (p/n 27904900).
GENERAL PUMP A member of the Interpump Group VF SERIES Before assembling the cover (sight glass side), be sure that the shim rings have been inserted. To help the covers fit onto the crankcase, we advise to use 3 screws M6 x 40, and then finish the operation with the screws supplied (M6 x 18) as shown in fig. 6.
GENERAL PUMP A member of the Interpump Group VF SERIES A) Assembly / Disassembly of the crankshaft without replacing the bearings After removing the side covers, as indicated in paragraph 2.1.2, check the rollers and their races for wear; if all parts are in good condition, fully clean the components with a suitable degreaser and grease them again evenly using the same oil in the crankcase. The same shims can be used again, being careful to fit them under the cover on the site glass side.
GENERAL PUMP A member of the Interpump Group VF SERIES The shim pack must be reassembled as follows: A) Insert the crankshaft in the crankcase, being sure that the P.T.O. shank comes out of the correct side. B) Fit the P.T.O. side flange to the crankcase paying great attention to the seal lip as indicated in paragraph 2.1.3, section C. C) Position the flange on the sight glass side as indicated in paragraph 2.1.3. D) Use a thickness gauge (see fig. 10).
GENERAL PUMP 2.2 Fluid End Repair A member of the Interpump Group VF SERIES 2.2.1 Disassembly of the Head - Liners - Valves The pump head does not require periodic maintenance. Service operations are limited to valve inspection or replacement if needed. To extract the valve units proceed as follows: A) Loosen the M8 x 100 screws that fix the liners to the head as shown in fig. 12. B) Unfasten the head screws M12 x 260, #5 and #6 as shown in fig.
GENERAL PUMP C) D) A member of the Interpump Group VF SERIES Separate the head and the liner manifold from the pump crankcase as shown in fig 15-16. Remove the M8 x 100 screws that fasten the liners to the head as shown in fig. 17 and proceed as indicated in fig. 18. When disassembling the liners, be careful not to lose the valve seats #1 and the flat valves #2 as shown in fig. 19; in fact, they may fall since they are only laid down.
GENERAL PUMP A member of the Interpump Group VF SERIES If the valve seats are blocked on the head due to the formation of limestone or oxide, they must be freed by inserting the appropriate tool (p/n 27508000 “VF12-“VF14) in the suction hole and operating as in fig. 20.) E) Extract the valve seat, #1, as shown in fig. 21; check components for wear and replace them if necessary.
GENERAL PUMP F) A member of the Interpump Group VF SERIES Extract the delivery pads, #3, and the related guides, #4, and springs as shown in fig. 22-23; check for wear and replace components as necessary. 2.2.
GENERAL PUMP A member of the Interpump Group VF SERIES B) Remove the M6 x 40 screws of the liner support as indicated in fig. 26, and separate as Shown in Fig. 27 B) Remove the seeger ring and the seal retainer ring as shown in fig. 28, and with an opposite pin extract the L.P. (low pressure) gasket, #1 as shown in fig. 29. At each disassembly, the low pressure seals and all O-rings must be replaced.
GENERAL PUMP E) A member of the Interpump Group VF SERIES With the liner separated from the support, and with an opposite plastic pin, #3 as shown in fig. 30, push out the H.P. (high pressure) packing, #4< by operating as in fig. 31. At each disassembly, the HP packing, #4 fig. 31, must be replaced. 2.2.
GENERAL PUMP F) A member of the Interpump Group VF SERIES Insert the H.P. packing; considered the slight interference between the seal and the liner, to avoid damage we advise using the appropriate tool (p/n 27508400 and p/n 27365300) as shown in fig. 34 and 35. The H.P. seal must be inserted into the liner with the o-ring in the plunger working direction as shown in fig. 34 and 36. Before inserting them into their seats, the H.P.
GENERAL PUMP C) A member of the Interpump Group VF SERIES Insert the anti-extrusion ring, #2, and the gasket bushing, #3, arranged as shown in fig. 37 - 38 - 39. The gasket bushing, #3, must be introduced into the liner with the outlets facing outward (crankcase side) as shown in fig. 38 and in fig. 39. The L.P. seal must be inserted into the liner with the sealing lip in the plunger working direction as shown in fig. 40 and fig.
GENERAL PUMP A member of the Interpump Group VF SERIES D) Reassemble the seals support unit as shown in Fig. 42 and fig. 43, replacing #1, #2 and #3. E) Assemble the support-liner unit by manually screwing the M6 x 40 screws as shown in fig. 44, then proceed with calibrations using a torque wrench as indicated in 3.
GENERAL PUMP VF SERIES A member of the Interpump Group 3. SCREW CALIBRATION Screw calibration by means of a torque wrench only. Description Cover fastening screws Oil discharge plug Lifting bracket fastening screw Conrod caps fastening screw Plunger fastening Choke Support fastening screw Head fastening screw Liner fastening screw Hydraulic motor flange screw Exploded View Position (From Owner’s Manual) 19 11 17 18 28 31 44 56 57 59 Fastening Torque (Ft. Lbs.) 7.4 29.5 73.8 28 14.8 7.4 11 59 25.
GENERAL PUMP A member of the Interpump Group VF SERIES Page 19
GENERAL PUMP A member of the Interpump Group 4. REPAIR TOOLS VF SERIES Pump maintenance may be carried out using simple tools for assembling and disassembling components. The following tools are available: For Assembly: • • • • • • Gasket Bushing VF12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p/n Gasket Bushing VF14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p/n HP Seal Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL PUMP MAINTENANCE LOG A member of the Interpump Group VF SERIES 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 www.generalpump.com email: sales@gpcompanies.com Ref 300683 Rev.
