26–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the
engine or motor, set the parking brake, and chock
the tires. Before working under the vehicle, always
place jack stands under the frame rails to ensure
the vehicle cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
26–01 Detroit® Automated
Transmission Fluid
Change and Magnetic
Plug Cleaning
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.
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.
1. Apply the parking brakes, and chock the rear
tires. Place a large drain pan under the
transmission.
2. 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.
1.
3. Clean the fill plug and the drain plug.
4. Install a new seal on the drain plug, then install
the plug and tighten it 45 lbf·ft (61 N·m).
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.
5. Add fluid until it is level with the lower edge of
the fill opening; see
Fig. 2. 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.
f27016703/31/2014
1
2
1. Drain Plug 2. Fill Plug
Fig. 1, Drain and Fill Plugs, Detroit Automated
Transmissions
A. Full B. Low
Fig. 2, Checking Transmission Fluid Level
Transmission 26
Business Class M2 Plus Maintenance Manual, 02/10/2023 26/1
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