Journals of universal joints are drilled and provided with lubrication fittings through which lubricant travels to all four oil reservoirs, through a small hole inside of each reservoir, direct to the needle bearings. Seals protect the bearings against lubricant leakage, dirt, and debris.

1. Lubricate the universal joints with chassis lubricant. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.



2. When greasing the joint, a flow of grease at all four trunnion seals must be visible in order to ensure lubrication of the joint.
3. If grease does not appear at all four trunnion seals, rotate the universal joint trunnion in all four directions while applying lubricant under pressure in order to relieve any airlock inside the joint. Air lock prevents the lubricant from reaching the bearing area.

Splines of the slip joint are lubricated through a lubrication fitting installed in the slip yoke. Apply grease gun pressure to the lubrication fitting until lubrication appears at the relief hole. Refer to Maintenance Schedule

The center bearing is permanently lubricated. Do not add or change grease in the bearing. When installing a new center bearing, fill the entire cavity with chassis grease. The quantity should be sufficient to fill the cavity to the extreme edge of the slinger surrounding the bearing. Filling the cavity to the extreme edge shields the bearing from water and contaminants.