KNUCKLE BLOCK 2H2947 - Caterpillar

Adding Oil to the Hubs of FX 2000 Hydraulic Actuated Fans
Illustration 1 g00898973
Rotate the hub until one of the oil drain plugs (1) or (2) is facing upward.
Remove oil drain plug (1) and oil drain plug (2).
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Insert a suitable dipstick into the hub. Use the dipstick to measure distance (A).
Add oil until dimension (A) is between 82.55 mm (3.25 inch) and 85.72 mm (3.375 inch). See Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the appropriate type of oil. Note: Do NOT overfill the hub. An air space is required to allow the oil to expand. Failure to leave the desired air space will result in failure of the seals.
Allow the oil to settle in the hub. If you use synthetic oil, allow extra time for the oil to settle. Recheck the oil level. Add additional oil, if necessary. Note: Do not overfill the hub. An air space is required. The air space will allow the oil to expand. Failure to leave an air space may result in seal failure.
Apply 6V-6640 Sealant to the threads of the oil drain plug. Reinstall the plug.
Check for any leaks and make any necessary repairs before operating the fan. Adding Oil to the Hubs of FX 3000 Hydraulic Actuated Fans
Illustration 3 g00920221
Typical Hub of a Hydraulic Actuated Fan
Rotate the hub until oil filler plug (3) is facing upward.
Remove oil filler plug (3) and oil level plug (4).
Add oil until oil begins to drip from the oil level hole. See Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the appropriate type of oil.
Allow the oil to settle in the hub. If you use synthetic oil, allow extra time for the oil to settle. Recheck the oil level. Add additional oil, if necessary. Note: Do not overfill the hub. An air space is required. The air space will allow the oil to expand. Failure to leave an air space may result in seal failure.
Apply 6V-6640 Sealant to the threads of the oil level plug