- Wheel Loader:
- 938H (S/N: MCC1-UP)
- 950K (S/N: FER1-UP)
- 962K (S/N: FLL1-UP)
- 966M (S/N: DYC1-UP)
- 972M (S/N: JPR1-UP)
- 980K (S/N: GTZ1-UP)
- 950K (S/N: FER1-UP)
- Work Tool:
- BUCKET (S/N: YZA1-246; Z1A1-UP; 7NW1-UP)
Introduction
This document is intended to provide general guidance for repair work performed on the bucket groups on the machines in this article 364-1883 Bucket Gp . Dimensions are approximate and pieces should be adjusted as necessary to achieve good weld joints. Any welding should be carried out in accordance with Cat repair guidelines.
Care should be taken not to put too much heat into the bucket during welding of any piece part. This precaution will limit any warping, weakening, or other deformation.
Alignment of all bores should be checked after any modification and, if necessary, brought into specification.
Reference
- Reference Disassembly and Assembly, RENR9765-03
- Reference Special Instruction, REHS1841-00, "General Welding Procedures"
Welding Requirements
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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; read and understand 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 manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts. See "American National Standard Z49.1, Safety in Welding and Cutting" published by the American Welding Society. American Welding Society2501 N.W. 7th Street Miami, Florida 33125 See "OSHA Safety and Health Standards, 29 CFR 1910", available from U.S. Department of Labor. U.S. Department of LaborWashington, D.C. 20210 |
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Welding quality is critical to the success of the installation procedures. Welds must be smooth and continuous. Do not undercut the welds. No overlap is allowed. Grind the ends of the welds to a smooth radius.
Prepare the metal for welding. Refer to ""Preparing the Metal for Welding" ". Refer to the illustrations in this Special Instruction for welding symbols and specifications.
Use AWS E7018 electrodes or equivalent electrodes to weld the guards to the work tool.
Dry all the electrodes completely. The electrodes can be dried by heating the electrodes to 300°C (572°F). The electrodes must be dried for at least 30 minutes.
Do not weld in windy conditions. Do not weld when temperatures are below 16°C (60°F).
Penetration characteristics may vary greatly depending on the following conditions:
- Electrode diameter
- Shielding gas
- Welding current
- Plate thickness
The following items also affect the welds:
- Geometry of welded joints
- Surface conditions
- Composition of the base metal and of the electrode
A root pass should be applied before each weld is finished.
Maintain a 3 mm (0.12 inch) minimum root opening on all cross welds and circle welds.
All welds to the stick must be welded in the direction from the rear of the stick toward the front of the stick.
For more welding information, consult the Special Instruction, REHS1841-00, "General Welding Procedures".
Preparing the Metal for Welding
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Personal injury can result from flame cutting or welding on painted areas. The effect of gasses from burned paint is a hazard to the person doing the cutting or welding. Do not flame cut or weld on painted areas. |
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| NOTICE |
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Before carrying out arc welding on the machine or on any equipment attached to the machine, disconnect all power and ground leads from the batteries in order to avoid possible damage to electronic components. |
All grease, paint, and foreign objects must be removed before welding. Any of these materials will discharge gas which will cause porosity in the weld deposit. Water and rust will cause hydrogen embrittlement. Hydrogen embrittlement causes cracks in the weld deposit.
Remove foreign objects with a wire brush, a buffer, or a grinder. Shot blasting the appropriate areas will also remove foreign material.
Remove any oil or grease with a Caterpillar approved solvent.
Repair Instructions
- Look for and repair weld any cracks that have developed where the spill guard meets the bucket.
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| Illustration 1 | g03409105 |
- Cut a slot between the spill guards and the bucket. Refer to Illustration 2.
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| Illustration 2 | g03410678 |
(A) 100 mm (3.937 inch) (B) 12 mm (0.472 inch) | |
- Fabricate plates (1) and (2), for each side, as shown in Illustration 3 and Illustration 4.
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| Illustration 3 | g03412182 |
(C) 200 mm (7.874 inch) (D) 10 mm (0.394 inch) (E) 150 mm (5.906 inch) (F) 27 mm (1.063 inch) radius (G) 100 degrees (H) 150 mm (5.906 inch) (1) Spill guard support plate | |
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| Illustration 4 | g03413816 |
(J) 10 mm (0.394 inch) to 12 mm (0.47 inch) thickness will vary depending on the bucket (K) 2 mm (0.0787 inch) radius (L) 4 mm (0.157 inch) (M) 10.8 mm110.8 mm (4.36 inch0.425 inch) (N) 35 degrees (P) 55.4 mm (2.181 inch) (2) Spill guard extension plate | |
- Install the additional plates as shown in Illustration 5.
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| Illustration 5 | g03414378 |
(1) Spill guard support plate (2) Spill guard extension plate | |
- Use an 8 mm (0.315 inch) fillet weld all around plate (1) and where plate (1) meets the spill guard and extension plate.
- Fill weld the bevel between extension plate (2) and the spill guard.
- Allow all welds to cool naturally.
- Clean and repaint all welded areas.