MOUNT THE COVER
Place the cab & T panels
12
assembly on the front
half of the bed so
its leading edge
lines up with
the outside
edge of the
bulkhead.
Loosely affix the T panel to the truck by finger-tightening two
13
cap clamps under each of the three ends of the T panel, the
clamps' bottom jaws under the bed rails at the two side ends
and under clamp bracket at the nose.
SET THE LOCK RODS
If plastic extends
18
beyond the bottom of
the vertical face of
the metal bed rails,
trim a two-inch length of it, flush
with the bed rail's bottom edge,
at both points under the tail
panel where a lock rod
will pass under the rails.
Peel the red adhesive backing from the edge
19
trim pieces. Affix them to the metal bed rail at
both points where a rod will pass underneath,
the bottom curl of their j's touching the
bottom edge of the rail.
Step 19 is unnecessary on '07–13
Silverados and Sierras.
Affix the edge trim to the painted metal only,
behind the plastic bed liner or bed rail cap, if present.
You may need to pull the plastic bed rail cap away from the metal
bed rail to provide enough clearance to get the edge trim on.
Using a tool to widen the curl of the 'j' can
make this step easier.
Loosen the set
20
screws on the
tailgate-panel
lock-rod linkages.
ATTACH THE GAS SPRINGS
If you are also installing a Side Bin, do so now. Refer to the Side Bin
24
Installation Guide for details.
Attach the 60-lb. gas springs to the cab-panel ball studs and the
25
two stronger gas springs to the tailgate-panel ball studs.
You'll find the strength of the gas springs printed on the sides of
the barrels.
To avoid premature failure of your gas springs, attach
them barrel up, shaft down.
Leave the cover closed and locked for 24 hours
26
to allow the weatherstrip adhesive, which is
pressure-sensitive, to fully cure.
DiamondBackCovers.com
1/8" hex key
Attach the tail panel by angling it 90° from the bed rails, sliding its
14
driver-side, loop-shaped hinge knuckle fully onto the correspond-
ing center-panel hinge pin, then dropping its passenger-side,
C-shaped hinge knuckle fully onto its corresponding pin.
FIRST
Lower the tail panel into the closed position.
15
Center the cover side to side.
16
Tighten the cap clamps with a 9/16" socket.
17
Road vibration can loosen your clamps. Retighten them after
100 miles. Check them every time you haul on top.
Adjust the lock rods & retighten the set screws so that (1) with lock
21
handle in the open position, the rod tips clear the bed rails, (2) with
handle in the closed position, the rod tips do not strike the bed
walls, and (3) the first bend in the rods points downward.
With the lock handle in the
22
closed position, position the
lock rods tight against the
underside of the bed rail lips
so that closing them
draws the panels down
& compresses the
weatherstrip. Tighten
the rod guide brackets
with a 7/16" socket.
For best weather protection, have a second person press down
on the cover while you adjust the lock rods.
Repeat steps 20–22 for the forward cab-panel lock rods so that:
23
A. with the lock handles in the open position, the rod tips
clear the striker brackets,
B. with the handles in the closed position, the forward rod
tips do not strike the bulkhead, and
C. in the closed position, they're tight against the underside
of the striker brackets, drawing the panels down & com-
pressing the weatherstrip.
90°
SECOND
FULLY MATED
7/16" socket
MAY 2017
NOVEMBER 2018
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