B&W Trailer Hitches 1251R - Manual (Page 3)

STEP FOUR
Now install the Side Plates. On the driver’s side, inside the frame rail, take
the brake lines loose by removing the plastic clip holder from the frame.
Hitting the plastic stud from the outside of the frame with a hammer will
easily get it loose. Pull the brake lines away from the frame only far enough
to slip the side plate in behind them. These side plates are bent to an angle
shape, and the wider of the two sides is to the top, and the two slots in the
top are to align with, and bolt to, the holes in the cross bars. Determine
which is for the right and left side of the truck. The driver’s side-Side Plate
has a large notch removed from the back end. Start bolts (½” x 1 ½”)
using a flat washer and lock washer on each into the bar through the top
slots. The vertical side of each side plate has large holes that align with
holes in the truck frame rail. Install the bolts (3/4 x 2”) with a flat washer
on each side, and a lock washer and nut, from the outside of the frame to
the inside. Tighten all fasteners.
STEP TWO
Before positioning the cross bars, move the electrical wire harness
by pulling the plastic clips loose from the driver’s side frame rail.
Select the front cross bar. The front cross bar has a notch machined
at one end for clearance over a frame rivet. With the drilled and
tapped holes down and the notch to the passenger side of the truck,
maneuver the bar to where it is on top of the frame in front of the
bed cross member forward of the 4” hole. Now put the back cross
bar above the frame behind the bed cross member rearward of the
4” hole with the drilled and tapped holes down.
STEP THREE
With the latch pin mechanism on the driver’s side, raise the
center section of the hitch into position between the cross
members from beneath the truck. The round receiver tube that
protrudes from the center section must fit through the hole in
the truck bed floor. If you are using an overhead-lifting device,
attach the lifting device to the latch pin through the receiver
tube to help support the center section. Align the holes in the
bars with the center section bridging bars, and fasten the center
section to the cross bars using the eight ½” X 1 ½” bolts, with
a lock washer on each. Use the overhead lifting device to put
some upward pressure on the center section if necessary to
aid alignment.
STEP FIVE
To install the safety chain brackets it is necessary to drill four ½” holes
through the truck bed floor. Drill the holes from beneath the truck, through
the four holes located near the round hitch receiver tube in the center
section. From the topside of the truck floor, insert a U-bolt through each
pair of holes. Place a spring and lock nut on each of the our legs. Tighten
the lock nuts until ¼” of thread extends through the lock nut.