TM 9-2520-246-34-1 CHAPTER 1 GENERAL MAINTENANCE INFORMATION 1-1. SCOPE. a. This manual contains the direct support and general support maintenance instructions for transmission model 3053A, transmission transfer models T– 136-21 and T-136-27, and power takeoff models WN-7-28, WND-7-28, and P-136-C. This manual includes procedures for disassembly, cleaning, inspection, repair, test, adjustment, and overhaul as authorized by the maintenance allocation chart. b. Appendix A gives a list of current and applicable references to the trans- mission, transfers, and power takeoffs used on the 2 l/2-ton, 6x6 series trucks, equipped with multifuel engines. c. Refer to TM 9-2520-246-34P for a listing of parts and special tools for the maintenance of the transmission, transmission transfers, and power takeoffs for the 2 l/2-ton, 6x6 series trucks. 1-2. GENERAL MAINTENANCE. General maintenance tasks relating to inspection care and maintenance of antifriction bearings are given in TM 9-214. Welding proce- dures that apply to this type of equipment are given in TM 9-237. For the lubrication of the transmission, transfers, and power takeoffs covered in this manual, refer to LO 9-2320-209-12/1. 1-3. TROUBLESHOOTING. Troubleshooting a fault within the transmission, trans- mission transfers, transmission power takeoff and transmission transfer power take– off is done as part of the repair procedures. Regardless of the symptom, all replaceable parts must be inspected and/or tested for serviceability. Any parts found to be faulty must be replaced during the reassembly process. In addition, test pro- cedures are given to make sure the reassembled equipment is working properly. 1-4. CLEANING. Refer to TM 9-247 for cleaning materials for this type of equipment. Special cleaning procedures for the transmission, transmission transfers, and power takeoffs are given in chapter 2. 1-5. PAINTING. For painting instructions for field use of the equipment covered in this manual, refer to TM 43-0139. 1-6. TORQUE VALUES. Critical torque values for a particular component are given in the maintenance procedures in chapter 2. When torque values are not given, bolts, screws and nuts are to be tightened as given in table 1-1. 1-7. SPECIAL TOOLS AND EQUIPMENT. Special tools and equipment are provided to make it easier to do particular maintenance tasks and to keep the equipment in good repair. Table 1-2 lists the special tools and equipment and gives a reference to the maintenance paragraph where they are used and what they are used for. 1-8. SAFETY INSPECTION AND TESTING OF LIFTING DEVICES. Refer to TB 43-0142 for safety inspection and testing of lifting devices used in this manual. 1-9. FORMS AND RECORDS. Maintenance forms, records, and reports which are to be used by maintenance personnel at all levels are listed in and prescribed by TM 38-750. 1-10. EQUIPMENT IMPROVEMENT REPORT AND MAINTENANCE DIGEST (EIR MD) AND EQUIPMENT IMPROVEMENT REPORT AND MAINTENANCE SUMMARY (EIR MS). The quarterly Equipment Improvement Report and Maintenance Digest, TB 43-0001-39 series, contains valuable field information on the equipment covered in this manual. 1-1