TB-9-1000-234-13 Exercising of M109 Recoil Mechanisms and Equilibrators Download
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TB 9-1000-234-13 1-1 CHAPTER 1 INTRODUCTION 1.1. Purpose. This bulletin provides instructions and guidance on methods of exercising all types of recoil mechanisms and equilibrators, on weapons mounted or unmounted, not fired for prolonged periods, in the field, in storage, or at a manufacturer or overhaul facility. 1.2. Scope. a. The instructions in this publication are applicable to operator, organizational, direct support, general support, and depot maintenance personnel responsible for exercising recoil mechanisms and equilibrators. b. This publication provides periodic preventive maintenance that is not covered in pertinent weapon manuals and specific methods for exercising each type of hydropneumatic recoil mechanism, hydrospring recoil mechanism, and equilibrator. c. Only the particular recoil mechanisms listed in table 1-1 do not require exercising. Table 1-1. Recoil Mechanisms Which Do Not Require Exercising RECOIL MECHANISM MODEL NUMBER WEAPON SYSTEM M1A8 HOWITZER, PACK: 75-mm, M116 M2A4 *HOWITZER, LIGHT-TOWED: 105-mm, M101 and M2A5 M101A1 M6AI *HOWITZER, MEDIUM, TOWED: 155-mm, M114 M6A2 M6B2 M37 HOWITZER, LIGHT, TOWED: 105-mm, M102 M37A1 *M101, M101A1, and M114 Howitzers with other recoil mechanisms will require exercising. 1.3 General Exercising Procedures. a. General. Exercising is the moving of rods and pistons in the recoil mechanism to reestablish a fluid film between the packings, seals, and sliding surfaces. It prevents drying of seals and corrosion of rod surface at the packing. Variations of exercising methods may be used, depending on availability of equipment. The exercising method selected must not be performed in such a way as to be injurious to the weapon and thereby cause future malfunctions. Deficiencies noted will be recorded on appropriate forms in accordance with DA PAM 750-8. Update your DA Form 2408-4 after exercising the recoil. Go to: https://aeps2.ria.army.mil/commodity/guncard/index.cfm. b. Exercising Frequency. Hydropneumatic and hydrospring recoil mechanism and pneumatic and hydropneumatic equilibrators must be inspected and exercised at least every 120 days.