Checking With the Sight Glass
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, extreme-pressure gear fluids, or multiviscosity lubricants.
With the transmission at operating temperature, and the vehicle on a level surface, check the fluid level in the transmission.
Some transmissions are equipped with a sight glass for checking the fluid level. For transmissions not so equipped, check the fluid level at the fill plug.
If the transmission is equipped with a sight glass, check the fluid level as follows:
- Clean the oil level sight glass. See Fig..
-
Drain Plug
-
Fill Plug
-
Sight Glass
Fig. 1, Eaton Fuller Transmission With a Sight Glass
-
- Check the fluid level in the sight glass. When the fluid
level is at or above 3/4 of the sight glass, then it is at or above
the minimum fill level. See Fig..
-
Full
-
Low
Fig. 2, Transmission Fluid Level Sight Glass
-
- If the fluid level is low, check the transmission for leaks, and correct as needed.
- If needed, add the recommended fluid, until it is at or
above 3/4 of the sight glass. See Table. for approved
transmission lubricants.
Table 1, Approved Manual Transmission Lubricants
Approved Manual Transmission Lubricants
Transmission Model
Lubricant Type 1
Temp. Range
SAE Viscosity
All Eaton Fuller
MobilTrans SHC 50 (RN 2952 E-5)
All
50W
Synthetic transmission lubricant approved by Eaton
All
50W
- Do not mix types or brands of fluid. Multi-weight and extreme-pressure gear fluids are not recommended.
Table 1, Approved Manual Transmission Lubricants
For more information and a complete listing of approved lubricants, refer to the Eaton website, see www.roadranger.com.