Section III. GENERAL MAINTENANCE INSTRUCTIONS

Table 5-1. Direct Support and General Support Troubleshooting - cont

TM-5-3825-225-14P Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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TM 5-3825-225-14&P Section III. GENERAL MAINTENANCE INSTRUCTIONS 5-4. GENERAL. This section contains the maintenance procedures for direct support and general support maintenance personnel. These procedures cover removal, cleaning, inspection, repair, and installation of water distributor component parts. The responsibility for each level of maintenance can be found in the Maintenance Allocation Chart (MAC) in Appendix B. 5-5. REMOVAL PROCEDURES. Refer to paragraph 4-8 for removal procedures. 5-6. CLEANING PROCEDURES. Refer to paragraph 4-9 for cleaning procedures. 5-7. INSPECTION PROCEDURES. a. Clean all parts before inspection. b. Inspect all bearings and bearing cups in accordance with TM 9-214. c. Inspection consists of checking for defects such as physical distortion, wear, cracks, and pitting. Dimensions of parts should be checked for compliance with maximum wear limits data. Parts subjected to heavy load or pressure should be inspected more thoroughly by performing surface temper, magnetic particle, or fluorescent penetrant procedures where necessary. NOTE If visual inspection proves the service of gears doubtful, perform a surface temper or magnetic particle inspection or both. d. Gears should be inspected on removal for the following conditions: (1) Normal wear in excess of practical limits. (2) Pitting of teeth due to extreme pressure loading. (3) Abrasive wear due to foreign materials in lubricant. (4) Scoring, seizing, and galling of teeth due to excessive loads and clearance. (5) Burning and loss of temper due to extreme high temperature operation caused by excessive friction and lack of lubrication. (6) Rolling or plastic yielding due to extreme loads over a long period. (7) Cracks and fractures due to shock loading. e. Inspect shaft splines for wear, pitting, rolling, peening, and fatigue cracks. In many instances, the same inspection procedure will apply as for gears. The condition, however, will in most cases be much less pronounced. Perform a magnetic particle inspection if serviceability of shaft spline is unclear. f. Check all hose surfaces for broken or frayed fabric. Checks for breaks caused by sharp kinks or rubbing against other parts of the equipment. Inspect metal tubing lines for kinks. Inspect the fitting threads for damage. Replace any part found defective. Following assembly and during initial operation period, check for leaks. g. Visually inspect all castings and weldments for cracks. h. Inspect all wires for chafed or burned insulation. Inspect all terminal connectors for loose connections and broken parts. 5-8. REPAIR PROCEDURES. Refer to paragraph 4-11 for repair procedures. 5-9. INSTALLATION PROCEDURES. Refer to paragraph 4-13 for installation procedures. 5-10. WELDING REPAIR. CAUTION Cracks and broken welds at critical stress points of highly stressed members will require very careful preparation and welding procedures to ensure successful repair. Whenever possible, these parts should be replaced rather than repaired. In those cases of emergency where welding repair Is the only practical means of restoring the serviceability of the vehicle, the Instructions given below must be rigidly followed. a. The surface of parts to be welded must be free from paint, grease, scale, and other foreign matter that can be removed by chipping and wire brushing. 5-5

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