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1. Verify that the king pin is clean and free
of burrs before installing the King Pin
Adapter. Remove any burrs with a
flat file. If you are having fit issues, see
"Challenge vs. Solution" on page 11.
2. Slide the King Pin Adapter over the king
pin and install one Adapter Plate Bolt
{A6} and Flat Washer {A5} horizontally
through the smaller cross hole nearest
the hitch ball (right). Install 1/2" Flange
Nut {A1} and hand tighten only.
3. Install the Adapter Bolt Reinforcement
Tube {A4} through the larger cross hole
in the Adapter Plate, then the remaining
Adapter Plate Bolt and Flat Washer
through this tube. Install nut and snug by hand.
4. The adapter can be installed with the hitch ball offset in two positions—either ahead or behind the king pin. Determine
the position you would like installed; placing the hitch ball ahead of the king pin will add additional cab clearance
during tight turns, but does not guarantee total cab clearance for short bed trucks. Likewise, placing the ball behind
the king pin will reduce the trailer-to-cab clearance. Orient the King Pin Adapter appropriately and make sure it's
aligned parallel with the king pin box.
5. Tighten the four Adapter Plate Set Screws {A3} evenly with a 9/16" socket, and torque to 20 ft. lbs. The gap between
the King Pin Adapter and the king pin box's skid plate may be uneven due to several conditions, e.g., concave or
convex skid plate or a skewed king pin.
6. Tighten the four 3/8" Flange Nuts {A2} until tight (approximately 20 ft. lbs.)
7. Torque both Adapter Plate Bolts installed in Steps 2 & 3 to 75 ft. lbs.
8. Should you want to change the orientation of the adapter, it should only be necessary to loosen the Flange Nuts
{A2} and Adapter Plate Set Screws, and rotate the Adapter Plate on the king pin. Loosening the remaining hardware
should not be necessary most of the time.
NOTE: It is important that you check the tightness of the adapter set screws often, as they can begin to work themselves
loose over a period of time from the normal stresses of towing.
8
KING PIN ADAPTER INSTALLATION
TOP ANGLE
A6 A5 A4
A1
A2
A3
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