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26–01 Manual Transmission
Fluid Level Checking
1. Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2. With the transmission at operating temperature,
check the fluid level in the transmission.
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 fluid is level with the lower edge
of the fill opening. See Fig. 1.
3. If needed, fill the transmission with fluid until
level with the lower edge of the fill opening.
See Table 1 for approved lubricants.
Approved Manual Transmission Lubricants
Lubricant Type
*
Temperature:
°F (°C)
SAE
Viscosity
Eaton Fuller Transmissions
†
MobilTrans SHC 50 (RN
2952 E-5)
All 50
Synthetic transmission
lubricant approved by Eaton
All 50
Heavy-duty engine oil (API
service classification CD or
SF)
Above 10 (–12) 40 or 50
Below 10 (–12) 30
TTC Transmissions
Heavy-duty engine oil (API
service classification CD or
SF)
Above 0 (–18) 30 or 40
Above –15
(–26)
30
Approved Manual Transmission Lubricants
Lubricant Type
*
Temperature:
°F (°C)
SAE
Viscosity
Straight mineral gear oil with
rust and oxidation inhibitor
(API GL–1)
Above 10 (–12) 90
Above –15
(–26)
80
Synthetic engine oil meeting
MIL-L-2104D, MIL-L-46152B,
API-SF, or API-CD
All 50
Mercedes-Benz Transmissions
MobilTrans SHC
®
DC All 50
*
Lubricants listed in order of preference. Do not mix types of oil.
†
Call 1-800-826-4357 for a complete list of Eaton approved lubricants.
Table 1, Approved Manual Transmission Lubricants
CAUTION
Operating a manual transmission with the fluid
level higher or lower than recommended can re-
sult in transmission damage. Do not overfill the
transmission; overfilling will force fluid out of the
case through the main shaft openings. Fluid over-
flow may also drain onto the clutch or clutch
brake, causing additional problems.
IMPORTANT: Do not mix types of fluid, because
of possible incompatibility. Do not use fluid addi-
tives or friction modifiers. Do not use multivis-
cosity fluids or EP (Extreme Pressure) gear flu-
ids. If switching from a petroleum-based
lubricant to a synthetic, all areas of each af-
fected 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
areas for the first 10,000 miles (16 000 km)
after changing to a synthetic from a petroleum-
based lubricant.
4. Clean the fill plug, then install it in the transmis-
sion. Tighten the plug as follows:
• 25 to 35 lbf·ft (34 to 48 N·m) for Eaton
Fuller transmissions with 3/4-inch pipe
threads.
• 60 to 75 lbf·ft (81 to 102 N·m) for Eaton
Fuller transmissions with 1-1/4-inch pipe
threads.
f260006b
10/05/94
A
B
A. Full B. Low
Fig. 1, Transmission Fluid Level Checking
Transmission 26
Acterra Maintenance Manual, March 2005 26/1