TM-9-2520-254-34 Direct Support for M113 TX100-1 Transmission 2520-00-066-4240 Download

CHAPTER 4 TROUBLESHOOTING 4-1. Purpose and General Instructions NOTE Information in this chapter is for use of Ordnance maintenance personnel, in conjunction with and as a supplement to the troubleshooting section of end item organization manual. It provides con- tinuation of instruction where a remedy in the organizational maintenance manual refers to Ordnance maintenance personnel for corrective action. a. Operation of a deadlined vehicle without a preliminary examination can cause further damage to a component and possible injury to personnel. By careful inspection and troubleshooting, such damage and injury can be avoided. In addition, the cause of faulty operation of a vehicle or component can often be determined without extensive disassembly. NOTE This chapter contains inspection and troubleshooting procedures to be per- formed while a disabled component is still mounted in the vehicle as well as after it has been removed. b. The inspections made while the component is mounted in the vehicle are, for the most part, visual and are to be performed before attempting to operate the vehicle. The object of these inspections is to determine the condition of the component and, if found defective, to take precautions to prevent further damage. c. The troubleshooting performed while the component is mounted in the vehicle is that which is beyond the normal scope of the using organization. Check the troubleshooting section of end item organizational manual, then proceed as outlined in this chapter. d. If the component alone is received by the Ordnance establishment, inspection should be performed to verify the diagnosis made when the component was in the vehicle. This inspection, to uncover further defects, or to determine malfunc- tions, is particularly important because it is often the only means of determining the malfunction without complete disassembly of the component. 4-2. Operating Characteristics To perform effective troubleshooting, the mechanic must have a thorough knowledge of— a. Construction Features. Refer to paragraphs 2- 1 through 2-11 for description and function of the transmission components. b. Functions of Components. Refer to paragraphs 2-12 through 2-26 for explanations of hydraulic operations and power flow through the transmission components. c. Operating Instructions. Refer to end item operator’s manual for instructions on operating the transmission while driving the vehicle in which it is installed. d. Oil Supply. Refer to paragraph 1-6 for oil supply information. e. Adjustments. Refer to paragraph 5-63 for adjustment procedures. f. Oil Pressures. Refer to table 1-1, paragraph 1- 7, for oil pressures. 4-3. Troubleshooting—Before Removal or Op- eration a. Do not operate the vehicle prior to completing the procedures described in this paragraph. Refer to paragraph 4-1 for the purpose of these in- spections. Inspect for oil leakage. Visually inspect all split-lines, connections, covers, output shaft, and plugs for oil leaks. Oil leakage at split-lines may be caused by loose bolts or defective gaskets. Tighten bolts where leakage is found. If leaks continue, install new gaskets. NOTE Inspect transmission again for oil leakage after starting vehicle engine (para 4-4). b. Inspect transmission assembly for loose components and loose, disconnected, or damaged linkage. Check linkage and operator’s controls for damage, wear, binding, or improper adjustment. Proper adjustment and operation of shift and throttle control linkage are essential to efficient performance of the transmission. 4-4. Troubleshooting—Before Removal and During Operation a. General. If the inspections in paragraph 4-3 do not reveal the cause of failure, and the vehicle is operable, further troubleshooting is necessary. Do not remove the transmission from the vehicle until the causes of trouble listed in table 4-1 are checked. Refer to paragraph 4-3 for the purposes and scope of these troubleshooting procedures. To make a thorough check of transmission performance, be sure the vehicle engine is properly tuned and that the transmission oil level is correct (para 1-6). Inspect again for oil leaks after starting engine. b. Troubleshooting Table. This condensed troubleshooting information will assist mechanics in diagnosing and correcting malfunctions in the 4-1