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 en-
gine, 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 Transmission Fluid
Level Checking
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. Fluid overflow
may also drain onto the clutch or clutch brake,
causing additional problems.
Do not mix types and brands of fluid, because of
possible incompatibility. Do not use fluid addi-
tives, friction modifiers, extreme-pressure gear
fluids, or multiviscosity lubricants.
Eaton Fuller Manual and
Automated
NOTE: This procedure does not apply to Proci-
sion transmissions. See the "Eaton Fuller Proci-
sion" procedure that follows.
1.
Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2.
Check the oil level in the transmission as follows.
2.1
Clean the area around the fill plug, then
remove the plug from the side of the
case.
2.2
Using your finger or a bent pipe cleaner,
see if the oil is level with the lower edge
of the fill opening. See
3.
If needed, fill the transmission with oil until level
with the lower edge of the fill opening. For ap-
proved lubricants, see
(manual transmis-
sions) or
(automated transmissions). For
more information and a complete listing of ap-
proved lubricants, refer to the Eaton website,
Eaton Approved Manual Transmission Lubricants
Lubricant Type
*
Temperature:
°F (°C)
SAE
Viscosity
Synthetic transmission
lubricant meeting Eaton PS-
386 lubricant specification
All
—
Heavy-duty engine oil
meeting MIL-L-2104D or
Caterpillar TO-4 Specification
Above 10 (–12)
40 or 50
Below 10 (–12)
30
*
Lubricants listed in order of preference. Do not mix types of oil.
Table 1, Eaton Approved Manual Transmission
Lubricants
Eaton Approved Automated Transmission Lubricants
Lubricant Type
*
Temperature:
°F (°C)
SAE
Viscosity
Synthetic transmission
lubricant meeting Eaton PS-
386 lubricant specification
All
—
*
Do not mix types of oil.
Table 2, Eaton Approved Automated Transmission
Lubricants
IMPORTANT: If switching from a petroleum-
based lubricant to a synthetic, all areas of each
affected component must be thoroughly drained.
Switching to a synthetic lubricant, when a
petroleum-based lubricant has been used for
50,000 miles (80 000 km) or longer may affect
transmission performance. Monitor all seal
f260006b
10/05/94
A
B
A. Full
B. Low
Fig. 1, Transmission Oil Level Checking
Transmission
26
Business Class M2 Maintenance Manual, March 2016
26/1
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