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UNDERDRIVE CLUTCH The underdrive clutch is hydraulically applied in first, second, and third (direct) gears by pressurized OVERDRIVE CLUTCH The overdrive clutch is hydraulically applied in third (direct) and overdrive gears by pressurized fluid REVERSE CLUTCH The reverse clutch is hydraulically applied in reverse gear only by pressurized fluid against the FLUID AND FILTER DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - CAUSES OF Burnt, discolored fluid is a result of overheating which has two primary causes. (1) A result of restricted fluid flow through the main and/or auxiliary cooler. This condition is usu- (2) Heavy duty operation with a vehicle not prop- erly equipped for this type of operation. Trailer tow- fluid if the vehicle is improperly equipped. Such vehicles should have an auxiliary EFFECTS OF INCORRECT FLUID LEVEL A low fluid level allows the pump to take in air along with the fluid. Air in the fluid will cause fluid FLUID CONTAMINATION Transmission fluid contamination is generally a result of: • adding incorrect fluid • failure to clean dipstick and fill tube when checking level • engine coolant entering the fluid • internal failure that generates debris • overheat that generates sludge (fluid break- down) • failure to replace contaminated converter after repair The use of non-recommended fluids can result in transmission failure. The usual results are erratic The dipstick cap and fill tube should be wiped clean before checking fluid level. Dirt, grease and Fig. 151 Input Clutch Assembly 1 - INPUT SHAFT 21 - 110 AUTOMATIC TRANSMISSION - 42RLE TJ DRIVING CLUTCHES (Continued) |