TERMINATION DATE

February 28, 2007

PROBLEM

The 1861275 or 2092841 6.5M Reach Boom may need to be repaired on certain 330C and 330CL Excavators. Cracks may occur on the side, top or bottom plates (at the front baffle area). Cracking is more likely to occur on machines in severe applications.

 

AFFECTED PRODUCT

PARTS NEEDED

Steel plates need to be dealer fabricated.

ACTION REQUIRED

See the attached Rework Procedure.

 

SERVICE CLAIM ALLOWANCES

Product smu/age whichever comes first

Parts

PARTS DISPOSITION

Attach. (1-Rework Procedure)

1. The needle peener should be of the multiple needle configuration. The needles should be 3 mm in diameter and must be rounded on the end which contacts the surface to be peened.
2. Air pressure - 550 kPa (80 psi) minimum/690 kPa (100 psi) maximum.
3. Peening time - 5 s/25 mm minimum
4. Peening shall not be done above 400 degrees C or below 5 degrees C.
5. Welds should be processed in the flat position if possible. If peened in the horizontal position the weld deposit should not exhibit any sign of rollover at the toe of the weld. The needle peener should be held perpendicular to the weld face and adherent surface.
6. The weld should be needle peened for a sufficient period of time and pressure to obtain a fully dimpled weld face and weld toes. The dimpled areas should extend into the parent material a minimum of 5 mm from both weld toes.

1. Refer to the service manual for your machine. Remove the boom from the machine. It is suggested to repair the boom at the service shop.
2. Use a torch to cut a 300mm diameter hole on both sides of the boom. Refer to Illustration 1. Plates for the two holes that are cut will have to be reused.
3. Fabricate two of reinforcement plate 1 and one of plate 2 from ASTM A36 or equivalent material. Refer to Illustration 2.
4. Fabricate 4 backup strips from ASTM A36 or equivalent material. Refer to Illustration 3.
5. Remove all cracks with arc air gouging rods. Use AWS E7018 or equivalent electrodes to weld and fill the groove, then grind smooth.
6. Apply the welds which attach the front baffle plate to the side plates, the top plate, and to the bottom plate. The welds must be smooth and continuous. Refer to Illustration 1 for welding specifications. Use LB-26 (AWS E7016 or E7018) electrodes or other equivalent electrodes for the fillet welds.
7. Tack weld the backup strip to the inner face of the boom side plates. Tack weld the cover plate to the boom side plate.
8. Weld the cover plates into position. Add needle peening to weld beads of the plates.
9. Grind and buff the weld.
10. Weld the reinforcement plates to the bottom and the side plates. Refer to Illustration 2. Add needle peening to weld beads of the plates.
11. Apply primer and paint to weld area.
12. Install the boom back onto the machine.

Illustration 1

Illustration 2 part 1 of 5

Illustration 2 part 2 of 5

Illustration 2 part 3 of 5

Illustration 2 part 4 of 5

Illustration 2 part 5 of 5
 
 

Illustration 3 part 1 of 3

Boom Hole

Illustration 3 part 2 of 3

Cut Plate

Illustration 3 part 3 of 3