GEARBOX-71 & 72 SERIES Owner’s Manual • Installation • Use • Maintenance Ref 300761 Rev.
GENERAL PUMP INDEX A member of the Interpump Group Gearbox-71 & 72 Series 1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3 3. SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3 2. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. SYMBOL DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL PUMP 1. INTRODUCTION A member of the Interpump Group Gearbox-71 & 72 Series This manual provides instructions for use, maintenance and repair of the speed reduction unit for 71 and 72 Series pumps and must be read carefully before the gearbox is installed and used. Unless otherwise stated, reference should be made to the specific manual for each pump. The regular functioning and working life of the pump require that the latter be used and maintained correctly.
GENERAL PUMP A member of the Interpump Group 4.2 Identification of the gear unit Gearbox-71 & 72 Series The unit can be identified by the symbol on the outside of the housing. The plates indicating the gear ratio and the direction of rotation are affixed (see Fig. 2). The plate giving the direction of rotation is present if the gear unit is supplied with the pump. Conversely, it must be affixed by the user and include the direction of rotation given in section 6.3. 4.2.
GENERAL PUMP A member of the Interpump Group 5. DIMENSIONS AND WEIGHTS Gearbox-71 & 72 Series The dry weight of the gear unit is 30.8 lbs. (14 Kg). 6. INSTRUCTIONS FOR USE 6.1 Lubricating oil After the gear unit has been installed, the prescribed volume of pump oil must be increased by ~ 15.5 ounces (0.5 L.). Check the level using the dipstick shown in Fig. 4, position 1. Oil check are best carried out with the pump at room temperature and in a perfectly horizontal position.
GENERAL PUMP A member of the Interpump Group Gearbox-71 & 72 Series In order to confirm the removal of the seal ring as shown below in section 7.2, Fig. 7 and Fig. 8, the oil level must also be visible on the gauge (Fig 4, position 3). 6.2 Connection to the gear unit The gear unit PTO drive shaft must not be rigidly attached to the engine.
GENERAL PUMP A member of the Interpump Group 7. INSTALLING THE REDUCTION GEAR UNIT Gearbox-71 & 72 Series The pump version can be modified only by qualified personnel. 7.1 Choice of drive position Depending on specific needs, before installing the gear unit it is wise to define the drive position, choosing from among the four available (D1, D2, D3, D4 for right-hand pumps, or S1, S2, S3, S4 for left-hand pumps), as shown in Fig. 6. 7.
GENERAL PUMP A member of the Interpump Group Gearbox-71 & 72 Series Insert the packing (Fig. 9) and assemble the gear housing, taking care to fit the hole onto the correct pin present on the crankcase (Fig. 10, position 1). Fasten the gear housing with the 6 M8 x 50 screws and tighten the latter with a torque wrench (Fig. 11 and 12) as indicated in section 9. Insert the crown into the pump shaft, apply the washer and use the wrench (Fig.
GENERAL PUMP A member of the Interpump Group Gearbox-71 & 72 Series Mount the bearing onto the pinion, pushing it as far as possible into the housing socket using a striking hammer (Fig. 15). Bearings and crown can be cold-inserted (Fig. 15). The operation can be facilitated by heating the parts in question to a temperature of between 250o - 300oF (120o - 150oC), ensuring that the ring nuts are fitted snugly into their housings. Fix the o-rings into the appropriate slots in the reduction gear unit (Fig.
GENERAL PUMP A member of the Interpump Group 8. DISMANTLING THE REDUCTION GEAR UNIT Gearbox-71 & 72 Series Remove the gear housing lid screws. Place 3 M8 grub screws or threaded screws (which will serve the function of extractors) into the holes and tighten (Fig. 20, position 1) and at the same time strike on the pinion so that the bearing remains attached to it during removal of the lid (Fig. 21). Using standard tools, remove the gear housing lid and take the bearing out of the pinion (Fig. 22).
GENERAL PUMP A member of the Interpump Group 9. SCREW TIGHTENING TORQUES DESCRIPTION Housing / lid screws Gearbox-71 & 72 Series POSITION IN EXPLODED DRAWING (page 12) TORQUE FT./LBS. TORQUE (Nm) 9 30 52 40 Crown screws 6 70 10. TOOLS TO BE USED FOR REPAIRS Pump repairs can be facilitated by using the appropriate tools, part numbers of which are given below: For assembly: Pump shaft/gear pinion oil seal buffer Buffer for gear unit housing lid F27904800 F27517400 11.
GENERAL PUMP A member of the Interpump Group 12. EXPLODED VIEW AND PARTS LIST POS. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PART NUMBER F72210784 F97618500 F72210820 F97615200 F90394800 F99314600 F10071135 F10071235 F10071335 F72211055 F99430700 F91857700 F10070835 F10070935 F10071035 F91500000 F91859300 F72210920 F97594000 90170000 DESCRIPTION Gear Housing Packing Straight pin, Ø8 x 10 Gear Housing Straight pin, Ø 5 x 10 O-ring, Ø209.22 x 2.62 Screw, TCEI, M8 x 50 Z34 Gear, 1.25:1 Z37 Gear, 1.
GENERAL PUMP MAINTENANCE LOG A member of the Interpump Group Gearbox-71 & 72 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 300761 Rev.
