Automatic Transmission Fluid ATF

The severity of the life of automatic transmission fluid is less severe than that of engine oil. Without the microscopic coke particles, soot, fuel interaction, and other contamination associated with motor oil, ATF must contend only with particles from friction plates and bearings from inside the transmission. Transmissions typically contain a nylon screen or filter of around 150 p to filter out these particles however, changing the fluid is the only way to eliminate them. The metallic particles present can contribute to the oxidation of the fluid and hasten its demise. 

Better low- and high-temperature viscosity characteristics Better cold starts Less evaporative loss Greater life 

Increased wear during break-in Possible compatibility with POM parts 

Thermal considerations are paramount for ATFs. A great deal of friction is produced, which generates heat and high-temperature spikes at the torque converter this will damage the fluid. ATF is designed to operate at temperatures around 95°C. At the torque converter, under extreme conditions, temperatures can reach 120°C. A transmission fluid should be designed to handle these temperature extremes. The transmission fluid will quickly break down above 120°C. Temperature spikes in the torque converter have been known to go above 120°C. 

The torque converter is a type of fluid coupling device that hydraulically connects the engine to the transmission—analogous to a mechanical clutch. Used in conjunction with the torque converter is a stator, which essentially assists at low engine speeds, thus increasing acceleration. The vanes inside the converter alter the shape of the fluid path into the stator. The stator captures the kinetic energy of the transmission to enhance torque multiplication. This process will not only increase heat, but also increase shear of the transmission fluid. In addition to torque conversion, at every shift event, clutch packs generate heat, which must be carried away by the transmission fluid. 

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Abdul et al. (1990) reported that upper layers of soil were saturated with automatic transmission fluid (ATF) after a storage tank leaked 208,000 gallons onto the surrounding soil. Lower soil layers contained less ATF volumetric ATF concentrations ranged from <10% to 40% at 80-0 cm above the ATF table. 

Dexron II (General Motors trademark specification for automatic transmission fluid, ATF), Dexron-II issued 1993 Dexron-III issued 1998. Dexron-IV issued 2000. 

Other interesting products that can be obtained from waste plastics using combined thermal and catalytic processes are alkylaromatic compounds, which possess industrial applications as automatic transmission fluids (ATF), detergents (linear alkyl benzenes, LAB), and improvers of cetane number in diesel fuels [104]. The process uses as raw material the olefins generated in a previous step of thermal and catalytic cracking, which represent a cheaper source of olefins alternative to the currently existing ones. No special details about the conditions applied for the olefin production are indicated, the emphasis being focused on the alkylation step. Alkylation catalysts comprise conventional Lewis... 

Abdul et al. (7) studied the performance of commercially available anionic and nonionic surfactants to clean a sandy soil contaminated with automatic transmission fluid (ATF). Using a batch shaker method, Abdul et al. mixed 5 g of contaminated soil with 100 mL of 0.5% by volume surfactant solution fw min. After the soil settled. 

Automatic transmission fluids, ATFs Frictional behaviour is a key performance characteristic of an ATF. During operational lifetime, thermal and oxidation byproducts can form in the lubricant. These have the potential to fill the porous holes found in the surface of the transmission, causing the clutch plates to slip. A dispersant is necessary to keep these by-products suspended in the oil, and typical treat rates vary between 1 and 6%. Additionally, the dispersant can positively affect friction if chosen correctly. A number of reasons for this have been proposed, including... 

Ford Motor Company researchers, in evaluating solvent refined base stocks for automatic transmission fluid (ATF) use, found that at a high degree of oxidation, times to a fixed oxygen uptake gave the best smooth curves when plotted against parameter l 23... 

Currently, the method is used predominantly for the analysis of liquid and gaseous process feeds and automotive lubricants. Results are shown below for an automatic transmission fluid (ATF) and butane (see Figs. 5 and 6, respectively). These results serve to illustrate the sensitivity and rq)eatability of the fluoride measurement that can be achieved with the current design. With the improved detector response, the level of detection has been shown to be less than Chat stated in the UOP Method 975-02. Work has started to develop the method as an ASTM standard for the measurement of fluoride in LPG and to establish the lower limit of detection, repeatability, and reproducibility. 

When fill up or replace the transmission fluid, it must use the Castrol TQ95 automatic transmission fluid (ATF) or other permissive oil. It will damage the performance and service life of transmission if use the unpermissive transmission fluid. Please ensure the transmission fluid level is correct The transmission also can be damaged if the transmission fluid level is incorrect. 

Automatic transmission fluid (ATF) performs many functions including lubrication, power transfer, hydraulic control, and cooling [73], This fluid is extremely complex consisting of a base mineral oil (consisting of paraffinic, naphthenic, and aromatic hydrocarbons) and an additive package. Newer ATF compositions consist of synthetic base materials. The additives prevent fluid oxidation, corrosion, loss of lubricity, and foaming. Even though antioxidants, inhibitors, and stabilizers are added to the ATF, the base oil... 

The behavior of automatic transmission fluid (ATF) and its effect on materials has been a recent subject of investigation. Several tests are used to determine the behavior and include "bench tests, laboratory motor-driven transmission tests, and field service tests [13,56], These are listed in Table 11. 

Fluoroelastomers are increasingly in demand to meet California Air Resources Board (CARB) requirements by 2004, which limit evaporative hydrocarbon emissions. Dy-neon fluoroelastomers, with low permeation number in alcohols and reformulated gaso-hnes, are used in the fuel delivery system, fuel lines, vapor hnes, O-rings, and custom seals. Dyneon BRE base-resistant elastomers are formulated for resistance to amine additives in automatic transmission fluids (ATF), engine oils, and gear lube oils— in addition to properties in other Dyneon fluoroelastomers including high temperature and chemical resistance. ... 

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