Torque Spec to Use for 8k Dexter Trailer Axles

Published 01/09/2024

Question:

Your Dexter axle nut tightness instructions look direct from Dexter literature. Why doesnt Dexter set axle nut tension with an inch lb torque wrench on 8K or other axles? Torque wrench method is pretty much the world std to to do so when you have apposing race bearing at work on a rotating axis. Thx, Rob

asked by: Rob R

Expert Reply:

Here's the mentioned torque setting to use for the spindle nut of the Dexter 8k axles:

1. After placing the hub, bearings, washers, and spindle nut back on the axle spindle in reverse order as detailed in the previous section on hub removal, rotate the hub assembly slowly while tightening the spindle nut to approximately 50 Ft. Lbs. (12" wrench or pliers with full hand force.)
2. Then loosen the spindle nut to remove the torque. Do not rotate the hub.
3. Finger tighten the spindle nut until just snug.
4. Back the spindle nut out slightly until the first castellation lines up with the cotter key hole and insert the cotter pin.
5. Bend over the cotter pin legs to secure the nut.
6. Nut should be free to move with only restraint being the cotter pin

For E-Z Lube axles using the new nut retainer:
1. After placing the hub, bearings, washers, and spindle nut back on the axle spindle in reverse order as detailed in the previous section on hub removal, rotate the hub assembly slowly while tightening the spindle nut to approximately 50 Ft. Lbs. (12" wrench or pliers with full hand force.)
2. Then loosen the spindle nut to remove the torque. Do not rotate the hub.
3. Finger tighten the nut until just snug, align the retainer to the machined flat on the spindle and press the retainer onto the nut. The retainer should snap into place. Once in place, the retainer/nut assembly should be free to move slightly.
4. If the nut is too tight, remove the retainer and back the nut off approximately one twelfth of a turn and reinstall the retainer. The nut should now be free to move slightly.
5. Reinstall grease cap.

The problem is the bearings don't work properly if the hub is too tight. It creates too much friction and causes failure. So basically you seat the hub with the initial torque and then get the setup just hand tight and everything works the way it needs to.