- Wheel Tractor-Scraper:
- 631G (S/N: DFA1-339,342-343,349-349,355-355)
- 637G (S/N: DFJ1-350,352-374,376-384,386-389)
Introduction
The following procedure is written in order to update the Wheel Tractor-Scrapers that are listed above with the new routing for the hydraulic lines. The updated routing of the lines will increase durability and serviceability.
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; 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. |
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Caterpillar dealer for replacement manuals. Proper care is your responsibility. |
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Personal injury or death can result from improper troubleshooting and repair procedures. The following troubleshooting and repair procedures should only be performed by qualified personnel familiar with this equipment. |
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Required Materials
| Required Parts | ||
| Part Number | Description | Quantity |
| 1S-0994 | Clip | 3 |
| 5M-3062 | Bolt | 2 |
| 5F-7844 | Boss | 2 |
| 6V-8398 | O-Ring Seal | 3 |
| 8T-4896 | Hard Washer | 2 |
| 156-1756 | Hose As | 1 |
| 210-9599 | Hose As | 1 |
| 211-5237 | Connector | 3 |
| 322-5810 | Hose As | 1 |
Weld Instructions
| Callouts of Welds | |
| Callout | Description |
| W1 | 3 mm (0.12 inch) Continuous fillet weld |
Shielded Metal Arc Welding
The Shielded Metal Arc Welding (SMAW) process may be used with the E7018 (ANSI/AWS A5.1) welding electrode. The weld that will be deposited by these electrodes will have the following mechanical properties.
| Tensile strength | 480 MPa (69600 psi) |
| Yield strength | 400 MPa (58000 psi) |
| Elongation | 22% |
| Impact toughness | 27 N·m (20 lb ft) |
These low hydrogen electrodes must be stored in an electrode oven at 120 °C (248 °F) when the electrodes are not being used. Scrap the electrodes if the electrodes get damp.
Note: Welding parameters will vary due to the position of the weld and the parameters will vary due to the manufacturer of the welding electrode.
The following chart relates to the electrode diameter and approximate current settings for welding.
| Diameter | Current |
3.2 mm (0.1260 inch) |
70-140 |
4 mm (0.16 inch) |
110-180 |
4.8 mm (0.19 inch) |
190-270 |
The welder should be set to use the DC reverse polarity setting. Remove all slag after every pass. Weld all joints from the bottom upward. The number of weld passes will depend on the width of the weld joint. Remove all slag after welding. Inspect the weld for low areas. Grind high spots in the weld with a coarse pad. Be sure not to grind out any base material. Finish blending the weld with a fine pad. No sharp edges are acceptable.
Installation Instructions
Note: Some machines may have already had the update to the hose routing. The correct routing is shown in Illustration 7.
- Remove the existing 152-3832 Hose As (1) from the housing for the drive shaft. Discard the hose. Do not remove the 8C-6872 Connector (2). Do not discard the 8C-6872 Connector . Remove the 152-3832 Hose As from the tee fitting at the differential case. Retain all of the clips and the mounting hardware for later use.
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| Illustration 1 | g01624495 |
(1) 152-3832 Hose As (2) 8C-6872 Connector | |
- Remove the existing 4Y-6343 Hose As (3), 148-8358 Elbow As (4), 6V-9157 Adapter (5), 1N-8559 Service Tee (6), and the 148-8345 Connector As (7) from the differential housing. Do not discard the 1N-8559 Service Tee . The tee will be reused on the connection for the transmission breather. Leave the breather and the connections to the breather intact.
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| Illustration 2 | g01624500 |
(3) 4Y-6343 Hose As (4) 148-8358 Elbow As (5) 6V-9157 Adapter (6) 1N-8559 Service Tee (7) 148-8345 Connector As | |
- Remove the existing 222-0377 Hose As (8) and remove the existing 6V-9157 Adapter (9) from the transmission housing. Discard all of these parts. Leave the breather and the connections to the breather intact.
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| Illustration 3 | g01624506 |
(8) 222-0377 Hose As (9) 6V-9157 Adapter | |
- Install two 6V-3231 Weld Bosses (W1). Refer to Illustration 4 for the correct placement.
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| Illustration 4 | g01624508 |
(A) 382.7 ± 3 mm (15.5 ± 0.12 inch) (B) 144.2 ± 3 mm (5.7 ± 0.12 inch) (C) 11 ± 3 mm (0.4 ± 0.12 inch) (D) 16 ± 3 mm (0.6 ± 0.12 inch) | |
- Install the 1N-8559 Service Tee (6) and two 211-5237 Connectors (10) to the top of the transmission case. Use a 6V-8398 O-Ring Seal on each 211-5237 Connector (10) .
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| Illustration 5 | g01624689 |
(6) 1N-8559 Service Tee (10) 211-5237 Connectors | |
- Install a 211-5237 Connector (10) onto the top of the differential case. Use a 6V-8398 O-Ring Seal on the 211-5237 Connector .
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| Illustration 6 | g01624815 |
(10) 211-5237 Connector | |
- Connect the 156-1756 Hose As (12) to the 1N-8559 Service Tee at the transmission case (6) and to the 8C-6872 Connector (2) at the housing for the drive shaft. Install three 1S-0994 Clips on hose (11). Use three 5M-3062 Bolts and three 8T-4896 Hard Washers in order to attach the clips to the bosses. Torque the bolts to 47 ± 9 N·m (35 ± 7 lb ft).
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| Illustration 7 | g01624819 |
(2) 8C-6872 Connector (6) 1N-8559 Service Tee (11) 1S-0994 Clips (12) 156-1756 Hose As | |
