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TM-9-2350-358-BD M109A6 Battlefield Damage Assessment and Repair Download

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TM 9-2350-358-BD SECTION IV. HYDRAULIC LINE REPAIRS 11-8. GENERAL To operate some of the vehicle mechanisms a considerable amount of energy must be exerted. Hydraulic power is used to perform these high energy tasks. High energy requirements (or high speed tasks) are usually met with high-pressure hydraulic hose or metal tubing. There are also metal low-pressure lines used when heat is a consideration or shape is critical. This section provides expedient repair procedures for the repair of high and low pressure tubes and hoses. 11-9. METAL TUBE BENDING General Information: Bending may be required to make tubing repairs. Dry sand can be poured into the tube to be bent If, tube bender is not available. The ends must be plugged to keep the sand from falling out. Soft metal tubes can be sealed with finger pressure but harder lines should have a plug inserted. After bending the tube, flush the sand from the tubing with a liquid to ensure removal of all the particles. 11-10. HYDRAULIC TUBE AND HOSE REPAIR (LOW PRESSURE) General Information: The M109A6 hydraulic system uses o-ring seal (ORS) hose and tube fittings, all fabricated or replacement hydraulic lines must use ORS fittings as end connectors. The repair procedures in this paragraph are for the repair or damage to the center section of low pressure hydraulic hoses or tubes. For the fabrication of lines or the replacement of end connectors reference paragraph 11-11 high pressure hose and tube repair. Option 1: Low-pressure line repair (same size tube ends). Limitations: Not recommended for pressure over 70 psi. Personnel/Time Required: • 1 soldier • 0.5-1.2 hours Materials/Tools: • AN/MS fittings (found in M2/3 generic BDR kit, Section III, Appendix C) • Hacksaw (found in M2/3 generic BDR kit, Section III, Appendix C) • Hand file (found In M2/3 generic BDR kit, Section III, Appendix C) • Deburring tool (found in M2/3 generic BDR kit, Section III, Appendix C) • Bending tool • Wire (scavenge from available source) • String (scavenge from available source) • Sealing compound (item 55, Appendix C) • Hose clamps (found in M2/3 generic BDR kit, Section III, Appendix C) • Tube cutter • Hose medium/high pressure (scavenge from available source) 11-5