TM-9-2520-254-34 Direct Support for M113 TX100-1 Transmission 2520-00-066-4240 Download
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(2) Inspect ball seats for wear and pitting. Reseat by lapping with the proper size ball. On seats where a nylon ball is used, a steel ball of the same size may be used for lapping. Discard parts in which the seats cannot be restored. n. Spool-Type Valves. (1) Inspect valves for wear, burs, scoring, and evidence of sticking. Try valves in their bores. All valves should move in their bores by their weight alone. Do not force valves. (2) Inspect edges of all valve lands. All edges should be square and sharp. Do not destroy these sharp edges in cleaning or repair operations. These sharp edges help prevent the accumulation of substances which might cause the valve to stick in its bore. (3) Remove burs with a soft honing stone. Reclean valves if necessary to remove gum and dirt. Discard all valves which have other defects. o. Sheet Metal Parts. (1) Inspect sheet metal parts for bends, cracks, distortion, interference with adjacent parts, and loose-welded points. (2) Straighten bent parts. Weld cracks or loose welds. (3) Discard governor oil collector rings if any damage is evident. p. Installation of Teflon Seals and Expanders. (1) Install expander into seal ring groove so that its ends bend toward bottom of groove. 5-5 General NOTE Some expanders may require additional bending to cause them to point toward the bottom of the groove. (2) While holding expander in groove, start seal ring into groove at a point diametrically op- posite expander ends. No lubrication is necessary for installation. (3) Install seal by hand. Tools or instruments might damage seal. Do not stretch seal any more than is necessary for installation. (4) Center piston in piston bore when in- stalling it, to prevent seal damage. Be extremely careful to avoid scratching, nicking, or distorting a Teflon seal. WARNING Do not destroy discarded Teflon seals by burning; toxic gases are produced. 5-4. Repair and Overhaul and (Rebuild) Standards a. Clearances and Wear Limits. Refer to paragraph 6-2 and 6-3 for data covering the sizes and fits of new parts and wear limits information. b. Torque Specifications. Refer to table 6-1 for general torque specifications for bolts, screws, and nuts. Special torque specifications are given in the text where applicable. c. Spring Specifications. Refer to table 6-2 for spring specifications. Section II. DISASSEMBLY OF TRANSMISSION INTO SUBASSEMBLIES a. Pictorial Steps. This section is arranged in consecutive pictorial steps, completely illustrating the disassembly of the transmission. Directly beneath each picture are simple disassembly in- structions, keyed to the picture. b. Transmission Component Groups. See ap- propriate exploded view of major component groups for parts identification and assembly sequence. 5-6. Disassembly Steps Drain oil from transmission, if it was not drained before transmission was removed from vehicle. Refer to end item lubrication order to draining procedures. See figure 5-1 through 5-52 for disassembly steps. NOTE Refer to end item organizational manual for instructions on removing the trans- mission from the vehicle and separating the transmission from the power pack. Figure 5-1 (Step 1). Attach lifting sling 4910-572-8614 (8356184) (A) to transmission, using four 3 / 8 -16 x 1 bolts and plain washers (B). 5-3