Checking the Fill Plug
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.
- Clean the area around the fill plug, and remove it from the side of the gear case.
- Confirm the fluid is level with the fill opening. See Fig..
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Full
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Low
Fig. 1, Checking Transmission Fluid Level
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- If the fluid level is low, check the transmission for leaks, and correct as needed.
- If needed, add the recommended fluid, until it is level
with the lower edge of the fill opening. 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
- Clean the fill plug, then install it. Tighten the plug
as follows:
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For an Eaton Fuller transmission with a plug with 3/4-inch pipe threads, tighten the plug 25 to 35 lbf·ft (34 to 48 N·m).
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For an Eaton Fuller transmission with a plug with 1-1/4-inch pipe threads, tighten the plug 60 to 75 lbf·ft (81 to 102 N·m).
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