Detroit™ Automated Transmission Fluid Change and Magnetic Plug Cleaning
- Apply the parking brakes, and chock the rear tires. Place a large drain pan under the transmission.
- Clean the area around the fill plug, then remove it from
the side of the gear case. Remove the drain plug from the bottom of
the case. See Fig..
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Drain Plug
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Fill Plug
Fig. 1, Drain and Fill Plugs, Detroit Automated Transmissions
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- Clean the fill plug and the drain plug.
- Install a new seal on the drain plug, then install the plug and tighten it 45 lbf·ft (60 N·m).
- Add fluid until it is level with the lower edge of the
fill opening; see Fig.. See the Detroit Transmission Fluid Service Information
brochure at http://dtna.info/DT12FluidsManual, for identifying the transmission type, estimated transmission
fluid capacities, and applicable fluid specifications.
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Full
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Low
Fig. 2, Checking Transmission Fluid Level
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- Operate the engine for five minutes after filling the transmission, then check the fluid level again.
- Install a new seal on the fill plug, then install the plug and tighten it 45 lbf·ft (60 N·m).
- Operate the vehicle to check for correct operation.
Fig. 3, CO2 DT12
Fig. 4, Classic DT12
Important: Drain the transmission when the fluid is warm. If not already warm, run the engine until the transmission fluid reaches operating temperature. Shift the transmission to neutral (N) and shut down the engine.
Notice: Operating a transmission with the fluid level higher or lower than recommended can result in transmission damage. Do not overfill the transmission. Overfilling will force fluid out of the case through the main shaft openings.
Do not mix types or brands of fluid, because of possible incompatibility. Do not use fluid additives, friction modifiers, or extreme-pressure gear fluids.
Notice: Detroit transmissions use synthetic lubricant that meets specific requirements. To see a list of approved lubricants and information to identify which transmissions they can be used with, see the Transmission Fluid Service Information brochure at http://dtna.info/DT12FluidsManual.
Note: In all cases, the correct fluid level is established by checking at the fill opening.