Manual Transmission Oil Level Checking
- Park the vehicle on a level surface. Apply the parking brake and chock the rear tires.
- Clean the area around the fill plug, then remove the plug from the side of the case.
- Check that the oil is level with the lower edge of the
transmission fill opening. See Fig..
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Full
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Low
Fig. 1, Transmission Oil Level Checking
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- If needed, fill the transmission with oil until level with
the lower edge of the fill opening. See Table. for approved lubricants.
For more information and a complete listing of approved lubricants, refer to the Eaton website, www.roadranger.com .
Table 1, Eaton Approved Manual and Automated Transmission Lubricants
Lubricant Type*
Temperature
SAE Viscosity
Synthetic transmission lubricant meeting Eaton PS-386 lubricant specification
All
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Table 1, Eaton Approved Manual and Automated Transmission Lubricants
* Do not mix types or brands of lubricant.
- Clean the fill plug, then install it in the transmission.
Tighten the plug as follows:
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25 to 35 lbf·ft (34 to 48 N·m) for transmissions with 3/4-inch pipe threads.
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60 to 75 lbf·ft (81 to 102 N·m) for transmissions with 1-1/4-inch pipe threads.
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Important: A lubricant level close enough to be seen or touched is not sufficient. It must be level with the lower edge of the fill opening.
Caution: Operating a manual 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. Fluid overflow may also drain onto the clutch or clutch brake, causing additional problems.
Important: Do not mix types of oil, because of possible incompatibility. Do not use oil additives or friction modifiers. Do not use multiviscosity oils or EP (Extreme Pressure) gear oils. 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 areas for the first 10,000 miles (16 000 km) after changing to a synthetic from a petroleum-based lubricant.