Lubricant Inspection
Rotate the hub so that the fill plug is down, and drain a small sample of hub oil into a plastic container that is free of debris, especially any metallic particles. Then use a magnet to probe the sample. Note whether there is substantial metallic debris present, and compare the oil color to new approved oil. Acceptable oil will have a color similar to new oil and have no water or metal contaminants.
If the oil is not acceptable, inspect the bearings for damage. Replace the bearings as needed, and install the hub, see of the Business Class M2 Plus Workshop Manual .
If the oil is acceptable, check the oil level. If it is not full (see Fig.), fill it to the bottom of the vent plug hole with approved lubricant (see Table.).
Table 1, Lubricant Specifications, Over-the-Road Service Applications
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Lubricant Specifications, Over-the-Road Service Applications |
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Lubricant Type |
Lubricant SAE Viscosity Grade |
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Synthetic Drive Axle Lubricants or Equivalent with SAE Specification J2360 or Military Specification MIL-L-2105E |
75W-90 |
Table 1, Lubricant Specifications, Over-the-Road Service Applications
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Hub Cavity Full
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Vent Plug
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Magnetic Drain/Fill Plug