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For crack inspections, proceed as follows:

1. Visual inspection of marked areas

- Clean testing area to be grease-free.

- Carry out visual inspection for cracks very carefully.

2. Crack Inspection

In order to exactly determine cracks and their course, the test set,Part No. 966 225, is available.

All testing means mentioned herein are contained in the above-mentioned test set.

Crack detection testing kit PN 966 225

No. PN Description

1 966 229 Permanent magnet2 092 846 40 Magnetic powder 3 092 847 40 Cleaner, spray can, 500 ml4 092 845 40 Contrasting agent5 232 723 40 Universal box

Procedure:- Remove paint in the area to be inspected, clean grease-free by means of cleaner.- Spray on white contrast color so that surface is covered well, permit to dry.- Apply permanent magnet in such a way that the presumed crack is between the

poles, check crosswise.- Spray on magnetic-particle powder between the poles.- Magnetize for at least 15 seconds, expect effect.- Cracks become clearly visible as black lines.

The inspection along the crack should be repeated severaltimes, in order to avoid errors.

- Mark the cracks (trace).

Cracks in paint may indicate cracks in steel structure!

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3. Measures to be carried out when cracks are found(Refer also to the PSN AH08507a Repair welding procedure)

- If small cracks are detected, they can be removed by grinding to a depth of 2 mm.

Grind only as long as cracks do not go straight through.Avoid notches from grinding.

- In case of deeper cracks, inform your local Komatsu Distributor and KomatsuField Service Manager for your region, in order to coordinate the furtherprocedure for welding repairs.

Info to your Komatsu Field Service Manager to include as much as possible:- Illustration of corresponding attachment part showing course of crack- Photos- Copies of spare-parts catalogue sheets, with course of crack sketched in.

The more information about location and size of the crack, the better we candetect the cause and the more efficiently the welding repair can be carried outlater on.

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4. Drawing with the most stressed areas markedWe recommend carrying out the described crack inspection at these areas at regularintervals, at least every half year or every 3000 working hours.