REFERENCE INFORMATION         Change 1        2-67 LUBRICATION SYSTEM The tests in para. 2-26 test the oil level, cleanliness, leaks in the system, and the CDR valve.  Return here when you've fixed everything you can or if no faults were found. PROCEDURE FOR CHECKING TRANSMISSION FLUID 1. Start engine. 2. Hold down brake pedal     and move transmission     shift lever through all     ranges including reverse. 3. Engage parking brake and     place shift lever in neutral.       Check fluid level on dipstick. 4. Proper level is between "FULL" and    "ADD" marks on dipstick. NOTE •  Burnt smell, discoloration,     or grit indicates worn or    damaged internal components.       Notify DS maintenance. •  Bubbles indicate an overfilled     system or air leaks     in the system.  Drain the fluid     and refill to proper level.         Refer to (para. 5-2). •  Milky appearance is due to water in     the system.  Drain the fluid from the   entire transmission and transmission   cooling system and install a new filter.     Refer to (para 5-2). •  Check fill tube for indications of fluid     being blown out. If fluid is being blown out,     check vent line for obstructions, and refill     transmission to proper level. Refer to     (para. 5-2). •  Transmission fluid coming out of dipstick    filler tube indicates a restriction in the    ventilation system. Check for clogged, melted, or crushed    lines and/or fittings between transmission and    atmosphere vent on air cleaner canister. Replace where    needed. Refer to (para. 5-16). Among the items are the driveshafts, suspension, differentials, and geared hubs. CHECK FLUID FOR A BURNT SMELL, GRIT, DISCOLORATION, AIR BUBBLES, OR A MILKY APPEARANCE. TM 9-2320-280-20-1