The Location of the Brackets on the Air Intake Tube Assembly Has Been Corrected on Certain Excavators{1071} Caterpillar

The Location of the Brackets on the Air Intake Tube Assembly Has Been Corrected on Certain Excavators{1071} [TIBU5884]

AIR INLET AND EXHAUST SYSTEM

LINES GP-AIR

The Location of the Brackets on the Air Intake Tube Assembly Has Been Corrected on Certain Excavators{1071}

1.1. Introduction

2.1. Problem

3.1. Solution

Excavator:
324D (S/N: ECH1-UP; AWN1-UP; CJX1-UP)
324D L (S/N: BYE1-UP; DFP1-UP; JAT1-UP; PYT1-UP)
325D (S/N: KDG1-UP; CJM1-UP)
325D L (S/N: PEH1-UP; DAP1-UP; SCR1-UP; CYW1-UP)
329D (S/N: BBF1-UP; WDK1-UP; LFW1-UP)
329D L (S/N: MNB1-UP; YFW1-UP; TAY1-UP)
330D (S/N: KAB1-UP; PFC1-UP; LCJ1-UP; PCK1-UP; MEY1-UP)
330D L (S/N: RDA1-UP; GBC1-UP; NBD1-UP; NEF1-UP; RDK1-UP; LDR1-UP; EDX1-UP)
336D (S/N: JER1-UP; KKT1-UP)
336D L (S/N: SKE1-UP; PRF1-UP; NLS1-UP)
Mobile Hydraulic Power Unit:
325D L MHPU (S/N: H3N1-UP)
329D L MHPU (S/N: J9D1-UP)
330D L MHPU (S/N: H3D1-UP)
336D L MHPU (S/N: J6D1-UP)

Introduction

The problem that is identified below has a known permanent solution. Use the solution that is identified below.

Problem

There have been reports of cracks in the welded joint between the mounting bracket and the tube on the 281-3510 Tube As on certain 330D and 336D Excavators and the 230-2871 Tube As on certain 324D, 325D, and 329D Excavators. The incorrect location of the bracket during the manufacturing process and vibration contribute to creating the cracks in the welded joint. If the existing air intake tube assembly fails, a leak in the air-to-air aftercooling line between the turbocharger and the air-to-air aftercooler will result. The leakage of air in the air inlet system causes low engine power and a loss of boost pressure.

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Illustration 1	g02130054
Location of 281-3510 Tube As crack (Typical example)

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Illustration 2	g02135253
Location of 230-2871 Tube As crack (Typical example)

Solution

The manufacturer of the tube assemblies for the Akashi plant has improved the manufacturing process. A new welding fixture has been put into production in order to locate the bracket correctly on the tube.

The tube assemblies in the Parts Distribution System are acceptable. Other suppliers of the tube assemblies did not have the issue.

Table 1 and Table 2 list the effectivity and adaptability of the improved tube assembly.

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Table 1
Improved 281-3510 Tube Assembly
Sales Model	Effectivity	Adaptability
336D	S/N:JER198-UP	S/N:JER1-197
336D	S/N:KKT149-UP	S/N:KKT1-148
336D L	S/N:SKE185-UP	S/N:SKE1-184
	S/N:PRF400-UP	S/N:PRF1-399
	S/N:NLS180-UP	S/N:NLS1-179
336D L MHPU	S/N:J6D397-UP	S/N:J6D1-396

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Table 2
Improved 230-2871 Tube Assembly
Sales Model	Effectivity	Adaptability
324D L	S/N:DFP637-UP	S/N:DFP1-636
	S/N:JAT191-UP	S/N:JAT1-190
	S/N:PYT114-UP	S/N:PYT1-113
329D	S/N:WDK164-UP	S/N:WDK1-163
329D L	S/N:MNB267-UP	S/N:MNB1-266
329D L	S/N:YFW172-UP	S/N:YFW1-171