Diamondback HD User Manual

Important installation information
PRE-INSTALLATION NOTES:
IMPORTANT!
Keep an eye out for these icons:
Normal Install Time
60 minutes
Tips to assist installation
Helpful Hints
1. Install the Bulkhead Prep Kit before installing
your DiamondBack cover. Refer to the Bulkhead
Prep Kit Installation Guide for details.
3. If you are installing a Side-Loading ATV Carrier
on cargo bed longer than 6 feet, you must mount
the center panel adapter bars prior to installing
your DiamondBack HD. Refer to the Side Adapter
Bars Installation Guide for details.
2. If you are installing a Low-Profile Cab Guard
or HD Cab Guard, you should mount it prior to
installing your DiamondBack. Refer to the Cab
Guard Installation Guide for details.
POSITION THE PANELS
Finger-tighten the cap clamps at
each corner of the center panel.
2
To avoid hinge damage, do not close the
panel until hinges are fully mated: Tilt the
panel past 90° and push to the left until the
hinge lock tabs interlock.
The bottom halves of the cap
clamps should be in the deck
rail system.
Mating hinges is
easiest when you
line up the longer,
left hinge pin first.
4. It’s possible for one person to install a DiamondBack
solo, but the whole process, especially positioning
the panels and adjusting the lock rods, is much
easier with two people.
Repeat step three for the
tailgate panel.
4
Position the cover
front to back so that
the leading edge of the
cab panel lines up with
the leading edge of the
bulkhead.
5
CONTINUED ON OTHER SIDE
Place the center panel across the
center of bed, cheated slightly toward
the tailgate.
1
Make the sure the
arrow sticker on the
underside of the
center panel is
pointing toward the
tailgate.
Slide the cab panel onto the center panel by mating their hinges. Close the
cab panel slowly. Make sure it doesn’t hit your cab.
3
Center the DiamondBack cover
side to side on the truck.
6
Tighten the cap
clamps with a
9/16” socket.
7
Retighten your clamps after 100
miles. Check them every time
you haul on top.
Cap Clamps (4)Gas Springs (4)
Safety Catch
Grommets (2)
Cab Panel
Tailgate Panel
Center Panel
PARTS INCLUDED:
TOOLS REQUIRED:
1/8”
Hex Key
7/16”
Socket
9/16”
Socket
Ratchet Wrench
INSTALLATION GUIDE
(800) 935-4002 | DIAMONDBACKCOVERS.COM
2005-UP TOYOTA TACOMAS
with the 60.3" Bed
Drill
1/8” or
3/16” Bit
1” Bit Marker

Diamondback HD Specifications

General

Style	Hard Folding
Material	Aluminum
Color	Black
Installation Type	Clamp-on
Type	Tonneau Cover
Dimensions	Varies by truck model
Compatibility	Varies by truck make and model

Summary

Pre-Installation Notes

Bulkhead Prep Kit Installation

Install the Bulkhead Prep Kit before installing the DiamondBack cover per its guide.

Cab Guard Mounting

Mount Low-Profile or HD Cab Guard prior to installing the DiamondBack cover per its guide.

ATV Carrier Adapter Bar Installation

Mount center panel adapter bars for ATV carriers on beds longer than 6 feet before installing HD.

Two-Person Installation Recommendation

Installing with two people makes positioning panels and adjusting lock rods much easier.

Positioning the Panels

Center Panel Placement and Securing

Place center panel, check arrow, finger-tighten clamps, then fully tighten with 9/16" socket.

Cab Panel Attachment

Slide cab panel onto center panel hinges, close slowly, ensuring hinges are fully mated to avoid damage.

Tailgate Panel Placement and Overall Alignment

Position tailgate panel and ensure cab panel leading edge aligns with the bulkhead.

Adjusting the Lock Rods

Cab-Panel Lock Rod Adjustment

Loosen set screws, adjust rod length for proper weatherstrip compression, and ensure rods point toward bed floor.

Tailgate-Panel Lock Rod Adjustment

Mark, drill, and insert grommets for tailgate panel lock rods, then adjust like cab panel rods.

Attaching Safety Catch and Gas Springs

Safety Catch Attachment

Fit the safety catch around ball studs on the driver side of the cab panel with the slotted half up.

Gas Spring Installation

Attach gas springs to ball studs with barrel up and shaft down to avoid premature failure.

Curing Period

Leave cover closed and locked for 24 hours to allow weatherstrip adhesive to fully cure.