Felling Head Limiter Crack Repair Procedure {6712} Caterpillar

Felling Head

HFW232 (S/N: HH8107-116,119-121)

Reference: Operation and Maintenance Manual, Welding on Machines and Engines with Electronic Controls

Introduction

This Special Instruction details the repair procedure for felling head limiter cracking. Refer to Illustration 1 for the area of the cracking.

Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.

Illustration 1	g06132153
(A) Cracking area

Safety Section

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Personal injury or death can result from fumes, gases, and ultraviolet rays from the weld arc. Welding can cause fumes, burn skin, and produce ultraviolet rays. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both to keep fumes and gases from your breathing area. Wear eye, ear, and body protection before working. Protect yourself and others by reading and understanding this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death. Read and understand the instructions of the manufacturer and the safety practices of your employer. Do not touch live electrical parts. See “American National Standard Z49.1, Safety in Welding and Cutting” which is published by the American Welding Society. American Welding Society 8669 NW 36 Street #130 Miami, Florida 33166-6672 1-800-443-9353 See “OSHA Safety and Health Standards, 29 CFR 1910” which is available from the U.S. Department of Labor. U.S. Department of Labor Washington, D.C. 20210 See applicable requirements for your local area.

Refer to the topic referenced at the beginning of this Special Instruction in your machine's Operation and Maintenance Manual for safety precautions regarding machine electronics.

Repair Procedure

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Illustration 2	g06132169

1. Grind any residual weld surfaces flush with the tube surfaces from point (1) to point (2).
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   Illustration 3	g06132182

2. Grind a 3 mm to 5 mm chamfer at the joint as close from point (1) to point (2) as possible.

3. V-groove weld from point (1) to point (2). Do not grind weld in order to keep the structural integrity and the convex shape.
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   Illustration 4	g06132191

4. Grind a 6 mm chamfer (3) into the horizontal joint to remove the existing weld material.

5. Bevel weld with fillet/flare over the joint. Wrap the tip with a smooth transition.