Krupp Hydraulic Hammers HM 720 Service Repair Manual

Repair manual

Krupp hydraulic hammers

HM 720/720V T.-Id.-Nr.3002984

Stand:04/98GB

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

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.

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 described below:

Please note!

These passages contain information on the correct use of the hydraulic tool and are aimed at avoiding mistakes during operation.

Warning!

Passages marked in this way contain safety information and instructions aimed at avoiding damage

Caution!

Passages marked in this way contain safety information and instructions aimed at preventing accidents and avoiding injury

2.Operational safety 2.1General

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

2.2Accident prevention regulations

Working tools should only be fitted in the way described in the operating manual.

Caution!

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 accessible.

Always wear protective glasses when fitting or removing the working tool as metal splinters may fly off when hammering out the locking pins.

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).

2.3Tools, 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.

2.4Operating media/ consumables

UseComments

HD oil HLP 32

Running the HM 720/V

In warmer climates, oils with a higher viscosity class should be used

High-performance bearing grease with solids content

Lubricating the working tool Krupp chisel paste (see operating manual)

Nitrogen N2 Filling the - high pressure accumulator - piston accumulator

Abrasive polishing paper, grain 600

Caution!

Removing scores

3. Tools

3.1 General tools

The tools are required for repair work are listed below:

3.2Service Box 3

The tools required for service work on the hammers are contained in Service Box 3.

Dimensions

Length760 mm

Width215 mm

Height250 mm

Service Box 3 and contents can be ordered under part ident. no. 3034016

Item.Qty.Designation Part. ident. no.

-1Toolbox, empty2267014

11Chisel paste1850852

21Nitrogen cylinder 2l1846262

31Filler valve1329516

41Test pressure gauge1329518

51Hose1329517

61Test gauge HM 720/V1852167

71Test gauge HM 960/V1852169

81 Pin punch d=15,5 L=130 1848819

91 Claw spanner size 50 tommy bar 0478861

101Screwdriver 50209249

111 Hexagonal head bolt M 12x150 0103866

Fig. 1

Service Box 3

Fig. 2 Service tools

3.3Special accessories

This chapter lists the special tools and apparatus which can be purchased separately from Krupp Berco Bautechnik to equip the workshop.

3.3.1Accumulator filling device

The tools listed in the table below are used to fill the high-pressure accumulator. The nitrogen cylinder (2/2) and the filler valve (2/3) from Service Box 3 are also required for filling.

ItemDesignation

1Filling device with pressure gauge, check valve, Phillips screwdriver and tommy screw, as well as items 2-4

Part ident. no.

0920415

2Mushroom head adapter1329889

3Phillips screw insert1329890

4Filling hosw1329805

device

Fig. 3

Accumulator filling

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3.3.2Power wrench

You can choose between an electronic or a hydraulic power wrench.

3.3.3Heli-Coil tools

The tools listed in the table below are used to replace the Heli-Coil inserts

cover (control system, high pressure accumulator)

Fig. 4 Electronic power wrench

Fig. 5 Hydraulic power wrench

Fig. 6 Heli-Coil tool

DesignationPart ident. no. Eye bolt1331717

ItemDesignationPart ident. no.

-Press-out tool, compl.1333443

1Grip0332324

2Screw0332323

3Press-out element0981669

4Press-out element0981667

3.3.4Fitting aid for percussion piston

3.3.5 Press-out aid for wear bushes

Fig. 7 Fitting aid

Fig. 8 Press-out aid