Krupp Hydraulic Hammers HM 720, HM 720V Service Repair Workshop Manual

Repair manual Krupp hydraulic hammers HM 720/720V T.-Id.-Nr. 3002984 Stand:04/98 GB KRUPP BERCO BAUTECHNIK chodina@live.co.uk chodina@live.co.uk

Repair manaual HM 720/720V chodina@live.co.uk chodina@live.co.uk

Repair manaual HM 720/720V Repair manual Krupp hydraulic hammers HM 720/720V © Krupp Berco Bautechnik GmbH Krupp Berco Bautechnik GmbH P.O.Box address: Postfach 10 21 52, D – 45021 Essen Postal address: Helenenstraße 149, D – 45143 Essen Telephone: +49 201 633 – 02 Fax: +49 201 633 – 1547 Fax for after-sales service: +49 201 633 – 1352 chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Contents 1 Contents Chapter Title Version Page 1. General.........................................................................................04/98............... 1 1.1 Explanation of the symbols used in this repair manual.................................. 2 2. Operational safety.......................................................................04/98............... 1 2.1 General................................................................................................................. 1 2.2 Accident prevention regulations............................................................................ 1 2.3 Tools, measuring and testing equipment.............................................................. 2 2.4 Operating media/consumables.............................................................................. 2 3. Tools.............................................................................................04/98............... 1 3.1 General tools......................................................................................................... 1 3.2 Service Box 3........................................................................................................ 2 3.3 Special accessories............................................................................................... 3 3.3.1 Accumulator filling device...................................................................................... 3 3.3.2 Power wrench........................................................................................................ 4 3.3.3 Heli Coil tools........................................................................................................ 4 3.3.4 Fitting aid for percussion piston............................................................................. 5 3.3.5 Press-out aid for wear bushes............................................................................... 5 4. Dismantling the hydraulic hammer............................................04/98............... 1 4.1 Removing the HM 720/V percussion mechanism from the hammer box.............. 1 4.2 Removing the high-pressure accumulator............................................................ 2 4.3 Removing the control slide valve........................................................................... 3 4.4 Removing the frequency switching system........................................................... 3 4.5 Removing the cylinder cover................................................................................. 5 4.6 Removing the percussion piston........................................................................... 6 4.7 Removing the tie rods........................................................................................... 7 4.8 Removing the cylinder.......................................................................................... 7 5. Checking the hammer box.........................................................04/98............... 1 5.1 Checking for cracks and indentations................................................................... 1 5.2 Wear to the bottom plate....................................................................................... 1 5.3 Checking the elastic pad....................................................................................... 2 5.4 Checking the damping elements........................................................................... 2 5.5 Checking the guide plates and the dust collar....................................................... 3 5.5.1 Checking the guide plates..................................................................................... 3 5.5.2 Checking the dust collar........................................................................................ 4 chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Contents 2 Contents Chapter Title Version Page 6. Assembling the hydraulic hammer........................................................04/98... 1 6.1 Tightening torques for screws and screw couplings on the HM 720/V.................. 1 6.2 Fitting the cylinder................................................................................................. 2 6.3 Fitting the percussion piston................................................................................. 2 6.4 Fitting the tie rods.................................................................................................. 3 6.5 Fitting the cylinder cover....................................................................................... 3 6.6 Fitting the frequency switching system.................................................................. 5 6.7 Fitting the control slide valve................................................................................. 6 6.8 Fitting the high pressure accumulator................................................................... 6 6.9 Fitting the piston accumulator............................................................................... 7 6.10 Fitting the HM 720/V percussin mechanism in the hammer box........................... 9 7. Changing the seals.................................................................................04/98... 1 7.1 Changing the cylinder seals.................................................................................. 1 7.2 Changing the seals between cylinder and cylinder cover..................................... 3 7.3 Changing the seal on the control system.............................................................. 3 7.4 Changing the seals on the high pressure accumulator......................................... 3 7.5 Changing the seals on the sealing bush............................................................... 4 8. Repair work..............................................................................................04/98... 1 8.1 Changing the screws on the high pressure accumulator...................................... 1 8.2 Changing the high pressure accumulator.............................................................. 1 8.3 Changing the tie rods............................................................................................ 2 8.4 Removing scores from control slide valve and bore.............................................. 2 8.5 Removing scores on percussion piston and cylinder bore.................................... 3 8.6 Replacing retainer bar and working tool................................................................ 3 8.7 Changing the wear bushes................................................................................... 4 8.8 Replacing the complete hammer box.................................................................... 6 8.9 Replacing guide plates and damping elements in hammer box............................ 6 8.10 Replacing the dust collar in the hammer box........................................................ 6 8.11 Repairing cracked welds....................................................................................... 7 8.12 Replacing the bottom plate on the hammer box.................................................... 7 8.13 Reworking the retainer pins for the damping elements......................................... 8 8.14 Weld seam preparation......................................................................................... 8 8.15 Preheating temperature........................................................................................ 8 8.16 Fillers.................................................................................................................... 8 8.17 Post-treatment of welds........................................................................................ 8 Authorised dealers and regional service centres chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Chapter 1 1 1. General In order to maintain the operational safety and reliability of the HM 720/V hydraulic hammer, repair work should only be carried out by Krupp-trained specialists using genuine Krupp spare parts. Krupp-trained specialists know which parts need replacing and when. Although this repair manual applies to the HM 720-1/V and HM 720-2/V hydraulic hammer models, the manual refers only to HM 720/V by way of simplification. Any specific differences between the two models are however highlighted. chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Chapter 1 2 1.1 Explanation of the symbols used in this repair manual To emphasise their importance, certain points in the repair manual are marked with symbols, which are de- scribed below: These passages contain information on the correct use of the hydraulic tool and are aimed at avoiding mistakes during operation. Passages marked in this way contain safety information and instructions aimed at avoiding damage. Passages marked in this way contain safety information and instructions aimed at preventing acci- dents and avoiding injury. Warning! Please note! Caution! chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Chapter 2 1 2. Operational safety 2.1 General In order to maintain the operational safety and reliability of the hydraulic hammer, repair work should only be carried out by trained specialists using genuine Krupp spare parts. For this reason, repair work should only be entrusted to Krupp-trained specialists who know which spare parts need replacing and when. 2.2 Accident prevention regulations To avoid the risk of injury, please observe the following instructions. Before starting work: Familiarise yourself with the repair manual and the appropriate regulations before starting work on the hydraulic hammer. When using or working on hydraulic hammers in the countries of the European Union, the regulations contained in the EC machinery directive 89/392/EEC must be observed and followed, as must national regulations governing pressurised vessels. In countries outside the European Union, the valid local statutes and regulations shall apply. The hydraulic hammer should only be repaired by specialists. When lifting/transporting the hydraulic hammer, use only the lug provided and hoisting equipment with sufficient capacity. Clear hand signals must be agreed on with the hoist operator beforehand. Never stand beneath hoisted loads. Stand the hydraulic hammer in a suitable device and secure it against falling over. The repair area must be clear and easily accessi- ble. Always wear protective glasses when fitting or removing the working tool as metal splinters may fly off when hammering out the locking pins. Working tools should only be fitted in the way de- scribed in the operating manual. The hydraulic hammer’s integrated piston accumulator is pressurised. Before dismantling the hydraulic hammer and before removing filling valve "G", the piston accumulator must be fully depressurised. Never use nails, screwdrivers or similar objects to bleed off the gas since this would damage the filling valve. The gas should only be bled off using the nozzle of the filling/test hose. Never use your fingers to check the alignment of the working tool recesses with the oblong holes for the locking bars. Never dismantle a hydraulic hammer which is still hot from running. Risk of burns! Wait until the hydraulic hammer has cooled down before dismantling it. Collect any oil which runs out and dispose of it correctly. The piston accumulator must only be filled with nitrogen from the green cylinder. Make sure that no other gas (e.g. air or oxygen) is allowed into the piston accumulator. When attaching the adapter use only Allen screws with a material quality of s = 640 N/mm² (material quality 8.8). Caution! Caution! Caution! Risk of explosion! chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Chapter 2 2 2.3 Tools, measuring and testing equipment The tools required for dismantling and re-assembling the HM 720/V are to be provided by the user (see Chapter 3.1). The special accessories used in this section are listed in Chapter 3.3. 2.4 Operating media/ consumables Use Comments HD oil HLP 32 Running the HM 720/V In warmer cli- mates, oils with a higher viscos- ity class should be used High-perform- ance bearing grease with solids content Lubricating the working tool Krupp chisel paste (see operating manual) Nitrogen N 2 Filling the - high pressure accumulator - piston accumulator Abrasive pol- ishing paper, grain 600 Removing scores Caution! chodina@live.co.uk chodina@live.co.uk

Repair manual HM 720/720V Version 04/98 Chapter 3 1 3. Tools 3.1 General tools The tools are required for repair work are listed below: Designation Part.-ident.-no. Qty. Sledgehammer 4 kg 1146433 1 Grease gun Compl. 3034567 1 Slugging ring spanner Size 55 0439439 1 Heavy-duty box spanner Size 55 0478217 1 Jaw spanner Size 46/50 0437943 1 Jaw spanner Size 41/46 0430613 1 Jaw spanner Size 30/32 0119581 1 Jaw spanner Size 19/24 0430652 1 Jaw spanner Size 13/15 0119582 1 Jaw spanner Size 10/13 1031834 1 Socket key Size 30 1146183 1 Socket key Size 24/27 0431002 1 Socket key Size 22 1031835 1 Socket key Size 14 3031396 1 Socket key Size 8/9 0430991 1 Claw spanner Size 46 0314519 1 Claw spanner Size 50 0478861 1 Allen key Size 22 0209445 1 Allen key Size 17 0209252 1 Allen key Size 14 0204963 1 Allen key Size 5 0209249 1 Power screwdriver insert Size 55 / 1 ½“ 1 Screwdriver 8 mm 0328143 1 Torque wrench 140-760 Nm / ¾“ 1 chodina@live.co.uk chodina@live.co.uk

Krupp Hydraulic Hammers HM 720, HM 720V Service Repair Workshop Manual

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