GENERAL MAINTENANCE INSTRUCTIONS

TM 9--2520--215--34 0018 00--1 GENERAL MAINTENANCE INSTRUCTIONS 0018 00 THIS WORK PACKAGE COVERS: General Maintenance Instructions GENERAL This work package presents instructions and information needed to keep the M88 series transmission and compo- nents in good repair. These instructions provide a step--by--step, item--by--item, illustrated text describing the XT--1410--4 and XT--1410--5A transmission, components services and maintenance. The maintenance functions described in this work package are limited to those functions authorized by the Mainte- nance Allocation Chart (MAC) for Direct and General Support Maintenance level activities. If maintenance is need- ed on any equipment or components that are not discussed in this work package, notify Depot maintenance. DISASSEMBLY AND ASSEMBLY PROCEDURES Complete disassembly of a component is not always necessary to make a required repair or replacement. Good judgment should be used to keep disassembly operations to a minimum. In disassembling a unit, first follow basic inspection procedures, then remove only necessary components and sub- assemblies. These components may then be reduced, as necessary, into individual parts. During disassembly, tag critical parts such as shims, bearings and electrical harnesses and leads, to facilitate reas- sembly. This is especially important for electrical equipment if circuit number tags are illegible or missing. CAUTION Never scribe--mark bearing surfaces. Mark gears on mating teeth by scribe marks, or with dye, indelible ink or paint to be certain of correct positioning at assembly. The use of chalk or crayon for marking should be avoided because of lack of permanence. During assembly, subassemblies should be assembled first, combined into major components where possible and then installed to form a complete component. Records to provide repair and replacement data and statistics should be carefully prepared and maintained accord- ing to DA PAM 738--750. REPLACEMENT OF PARTS Cotter pins, locking wires, lockwashers, packing, seals, strips and gaskets should be discarded at transmission dis- assembly. New parts should always be supplied to replace such items. Care must be used to avoid damage to transmission components during disassembly, cleaning, inspection, repair and assembly. Nicks, scratches and dents caused by careless handling may cause oil leakage or improper func- tioning. This may result in transmission failure. All defective parts must be replaced. Heavy components should be handled with slings and hooks. Blocking the transmission for support in various positions is of special impor- tance from a safety standpoint as well as for prevention of damage. All bolts, nuts and screws must be installed at the prescribed torque tightness to ensure proper assembly. Use of a torque wrench and careful attention to prescribed torque will help prevent distortion, oil leaks and stripped threads. All standards torquing requirements for bolts, screws and nuts are listed in WP 0086 00. When special require- ments apply, they will be included in the text.