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FLUID AND FILTER DIAGNOSIS AND TESTING 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 pressures to be CAUSES OF BURNT FLUID Burnt, discolored fluid is a result of overheating which has three primary causes. 1. Internal clutch slippage, usually caused by low line pressure, inadequate clutch apply pressure, or clutch seal failure. 2. A result of restricted fluid flow through the main and/or auxiliary cooler. This condition is usually the result of a faulty or improperly installed drainback valve, a damaged oil cooler, or severe restrictions in the coolers and lines 3. Heavy duty operation with a vehicle not properly equipped for this type of operation. Trailer towing or similar high load operation will overheat the transmission fluid if the vehicle is improperly equipped. Such vehicles should 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 breakdown) • failure to replace contaminated converter after repair The use of non-recommended fluids can result in transmission failure. The usual results are erratic shifts, slippage, The dipstick cap and fill tube should be wiped clean before checking fluid level. Dirt, grease and other foreign mate- Engine coolant in the transmission fluid is generally caused by a cooler malfunction. The only remedy is to replace The torque converter should be replaced whenever a failure generates sludge and debris. This is necessary STANDARD PROCEDURE FLUID LEVEL CHECK Low fluid level can cause a variety of conditions because it allows the pump to take in air along with the fluid. As Improper filling can also raise the fluid level too high. When the transmssion has too much fluid, the geartrain HB AUTOMATIC TRANSMISSION 545RFE - SERVICE INFORMATION 21 - 685 |