2.1 GENERAL MAINTENANCE PROCEDURES

TM 5-3895-373-34 CHAPTER 2 DIRECT SUPPORT/GENERAL SUPPORT MAINTENANCE OF PAVING MACHINE 2.1 GENERAL MAINTENANCE PROCEDURES. General maintenance procedures include procedures to follow for equipment washdown, component cleaning, removal and disassembly, inspection, reassembly and installation, and repainting. Refer to maintenance tasks for specific guidelines. All maintenance operations must include good shop practices and proper safety. Some general maintenance procedures are as follows: a. Wear protective clothing as specified in maintenance tasks. Observe all warnings, cautions, and notes specified in maintenance tasks. b. Areas of the paving machine exposed to paving material require washdown prior to maintenance. Use spray washdown equipment located on the paving machine in an approved washdown area. Use mechanical means such as scrapers and stiff wire brushes to remove paving material buildup. Dispose of paving material residue in accordance with local hazardous material disposal procedures. c. Clean components before servicing. Steam cleaning may be required. Use cleaning solvent as a general degreaser unless specified otherwise in the maintenance task. Rinse all components thoroughly with cleaning solvent. Use a stiff bristle brush to remove hardened deposits. d. Unless otherwise specified in maintenance procedures, all fasteners are treated with thread locking compound. If the fastener cannot be removed by mechanical methods, heat fasteners with heater gun to 500° to 600°F (2320 to 315°C) for several minutes. Use thread locking compound solvent to remove thread locking compound from fasteners after they are removed from the machine. If thread locking compound solvent does not remove buildup on threads, discard fastener. e. Use a backup wrench when loosening or tightening inline fittings. Using a backup wrench will prevent unnecessary damage to attached lines and/or smaller fittings. f. During removal and disassembly procedures, inspect all parts and components for signs of wear or damage. Discard all gaskets and preformed packings. When scraping gasket material from parts, do not scratch or gouge metal surfaces. Check for cracked or warped castings. Clean all parts with cleaning solvent after inspection unless specified otherwise in maintenance task. Dry parts with a clean, cleaning cloth or compressed air. For critical internal hydraulic components, use a clean, lint-free cloth. Do not use greater than 30 psi (207 kPa) maximum air pressure to dry components. Protect internal parts of engine and hydraulic components to prevent contamination after cleaning. Always tag electrical wires, harnesses, hydraulic hoses, fuel hoses, coolant hoses and metal tube assemblies, etc, prior to removal. Cap or plug hydraulic and fuel hoses and fitting after removal. g. During removal and disassembly procedures, check all fasteners for damaged threads. Replace damaged fasteners. Drill out any broken bolts or studs. Retap holes to correct size after drilling. Replace all lockwashers and self-locking nuts. Replace distorted flat washers. h. Observe all torque values stated in maintenance tasks. Torque values are based on modified SAE Grade 8 fasteners and clamping load. i. Replace all tie-wraps removed from hoses and wiring. Replace tie-wrap in approximately the same positions they were in prior to removal. j. Check hydraulic hoses for leaks, blisters, or kinks. Replace damaged hydraulic hoses. Check hydraulic fittings for damage or stripped threads. Replace fittings if damaged. Use protective caps and plugs on lines and components to prevent contamination. Use only clean hydraulic oil when refilling hydraulic systems. Lubricate all seals and preformed packings when reassembling hydraulic components. Replace missing, worn, or damaged chafing gear. 2-1