Western Star 47X 2020, Maintenance Manual

Page: 56 / 166

26–02 Detroit
™
Automated
Transmission Fluid
Level Inspection
NOTICE
Operating a transmission with the fluid level
higher or lower than recommended can result in
transmission damage. Do not overfill the transmis-
sion. 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 addi-
tives, friction modifiers, or extreme-pressure gear
fluids.
With the transmission at operating temperature, and
the vehicle on a level surface, check the fluid level in
the transmission.
1. Clean the area around the fill plug, then remove
it from the side of the gear case. See
Fig. 1 .
2. Using your finger or a bent pipe cleaner, see if
the fluid is level with the fill opening. See
Fig. 2 .
3. If the fluid level is low, check the transmission for
leaks, and correct as needed.
NOTICE
Detroit transmissions use synthetic lubricant that
meets specific requirements. To see a list of ap-
proved lubricants, transmission models, and oil
change intervals, see the Transmission Fluid Ser-
vice Information brochure at
http://dtna.info/DT12FluidsManual .
4. If needed, add the recommended fluid until it is
level with the lower edge of the fill opening. See
the Transmission Fluid Service Information bro-
chure at
http://dtna.info/DT12FluidsManual for
approved transmission lubricants.
5. Clean the fill plug and install a new seal on it.
Install the plug in the side of the gear case, then
tighten it 45 lbf·ft (60 N·m).
26–03 Eaton Fuller
Transmission Fluid
Change and Magnetic
Plug Cleaning
NOTE: Information in this MOP applies to Eaton
Fuller manual and automated transmissions.
Fluid change intervals are extended to 500,000
miles (800 000 km) on any vehicles filled with
synthetic transmission fluid.
NOTICE
Operating a transmission with the fluid level
higher or lower than recommended can result in
transmission damage. Do not overfill the transmis-
sion. 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 addi-
tives, friction modifiers, extreme-pressure gear
fluids, or multiviscosity lubricants.
IMPORTANT: Drain the transmission when the
fluid is warm. If not already warm, run the en-
gine until the transmission fluid reaches operat-
ing temperature. Shift the transmission to neu-
tral (N) and shut down the engine.
1. Apply the parking brakes, and chock the rear
tires. Place a large drain pan under the transmis-
sion.
2. Clean the area around the fill plug, and remove it
from the side of the gear case. Remove each
drain plug from the bottom of the case.
3. Clean the fill and drain plugs. For magnetic
plugs, use a piece of key stock or any other con-
venient steel slug to short the two magnetic
poles and divert the magnetic field.
A. Full B. Low
Fig. 2, Checking Transmission Fluid Level
Transmission
26
47X and 49X Maintenance Manual, June 2021
26/2