Table 2-2. Troubleshooting (cont)

TM 9-2350-256-34-1 Table 2-2. Troubleshooting- Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FUEL TANKS-Continued (4) Inspect tank for any obvious cracks or open seams. Inspect mounting brackets, mounts and cushions for cracks or breaks. Weld assembly and components as required (5) Close all openings with temporary plugs or other closures and apply 3-4 psi internal air pressure. (6) Apply soapy water solution, consisting of liquid soap diluted with20-40% water, to all exterior surfaces of tank and inspect for air bubble formation. (7) Mark location of any bubble formation. rinse and dry tank and weld the marked areas (8) Repeat points (5), (6), and (7) if required. (9) The electric intank fuel pump and other fittings and accessories may be assembled on the ranks either before or after installation of the tanks in the vehicle. Refer to TM 9-2350-256-20, Medium Recovery Vehicle, M88A1 for installation instructions. 2. FUEL LEAKING FROM RIGHT AND/OR LEFT REAR FUEL TANK Step 1. Remove the engine deck (TM 9-2350-256-20, Medium Recovery Vehicle, M88A1) . Inspect fuel tank for cracks or open seams Fuel leaking from a small crack can usually be detached by dust clinging to the wet area Step 2. If fuel leak cannot be detected or repaired with powerplant installed in vehicle. remove the fuel tank. (For removal of left rear fuel tank, refer to para. 2-16) (For removal of right rear furl tank, refer to para. 2-19). Step 3. If fuel leak cannot be detected or repaired with fuel tank installed in vehicle. remove the powerpack(TM 9-2350-256-20). a. Drain the fuel system (TM 9-2350-256-20, Medium Recovery Vehicle. M88A1. b. Slush tank interior with methylene chloride (pure) or chemical cleaners as specified in TB 750-1047. Elimination, of Combustibles From Interiors of Metal or Plastic Gasoline and Diesel Fuel Tanks, to remove residual fuel. dirt. sediment, and other foreign matter. Drain and dry fuel tank c. Inspect tank for any obvious cracks or open seams. Inspect mounting brackets, mounts, and cushions for cracks and breaks. Weld assembly and components as required. d. Close all openings with temporary plugs or other closures and apply 3-4 psi internal air pressure. e. Apply soapy water solution, consisting of liquid soap diluted with 20-40% water. to all exterior surfaces of tank and inspect for air bubble formation. f. Mark location of any bubble formation. rinse and dry tank and weld the marked areas. g. Repeat d. e. and f. if required. PURGE PUMP 3. MAIN ENGINE MANIFOLD HEATERS DO NOT WORK Check manifold heater switch and associated wiring Refer to Fault Isolation Diagram, fig2-23, TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. Repair or replace defective components or parts (para 3-27 and 3-28) 4. PURGE PUMP DIFFICULT TO PUMP OR DOES NOT PUMP Disassemble purge pump (para 3-26). Clean all parts in mineral spirits paint thinner or drycleaning solvent. Inspect all components for cracks. distortion, and/or evidence of excessive wear Replace all defective components. ELECTRICAL SYSTEM 5. BATTERY-GENERATOR INDICATOR READS IN YELLOW OR LOWER RED REGION WITH MAIN ENGINE RUNNING AND MAIN GENERATOR IN SYSTEM (GENERATOR CUTOUT SWITCH CLOSED) Step 1. Check for defective switching relay box. Refer to Fault Isolation Diagram, fig. 2-35, TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. Repair or replace switching relay box (para 3-47). Step 2. Check for defective main generator armature relay. Refer to Fault Isolation Diagram, fig. 2-35, TM 9-2350-256-20. Medium Recovery Vehicle, M88A1. Repair or replace main generator armature relay (para 3-46). 6. BATTERY-GENERATOR INDICATOR READS IN YELLOW OR LOWER RED REGION WITH APU ENGINE RUNNING AND APU GENERATOR SWITCH ON. (MAIN ENGINE NOT RUNNING). Step 1. Deleted Step 2. Deleted Step 3. Check for defective APU generator switch. Refer to Fault Isolation Diagram, fig. 2-39, TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. Replace switch, if defective (para 3-45). Step 4. Check for defective hydraulic pressure switch. Refer to Fault Isolation Diagram.fig. 2-38, TM 9-2350-256-20, Medium Recovery Vehicle. M88A1. Adjust or replace pressure switch (para 3-63). Step 5. Check for damaged or defective APU generator (para 4-2d). Refer to Fault Isolation Diagram, fig. 2-35, TM 9-2350-256-20. Medium Recovery Vehicle, M88A1. Replace defective generator (para 4-2b). C h a n g e 8 2 - 7