DECKED MG3 – MG4 Truck Bed Storage System Instruction Manual

: June 14, 2024
: DECKED

DECKED MG3 – MG4 Truck Bed Storage System

Note : Most of the images in these instructions are of the short bed, but they apply to both length beds.
2015-CURRENT

TOOLS REQUIRED

short 7/32″ hex wrench
7/16″ socket
3/8 socket
1/8″ hex wrench
7/16″ wrench

ASSEMBLY OVERVIEW

DECKED carton
LEFT DECK HALF· l
RIGHT DECK HALF· l
CENTER VERT · l
CABSIOE VERT · l
DRAWER· 2
LEFT AMMO CAN· l
RIGHT AMMO CAN· l
LEFT STUD · l
RIGHT STUD · l
AMMO CAN LIO · 2
C·CHANNEL · 2
RULER· 1
HARDWARE BOX· 1
TORSION BRACE· I
BOTTLE OPENER · 1

Hardware box -unbaggad components

(inside DECKED carton) :
Shims -2

Weather strips -2

HARDWARE box -bagged components
PREP MG3/MG4 -1
Sl • l
82 -1
Nl -1
J5 · 2
DRAWER 1-1
DRAWER 2 · 1
WHEELS· 1
FINAL MIO · 1
PREP-EXTRA· 1
WASHERS· 1

ASSEMBLY OVERVIEW

▼ HEY! TORQUE BOY: READ BEFORE YOU INSTALL DECKED ▼

DON’T go rogue on us, please read the instructions.
DON’T over tighten bolts, get em’ hand-tight.
DON’T use power tools.
If you don’t follow directions and do use power tools:
l). Set clutch at a very low setting.
2). If you blow it: Two extra threaded inserts are included in BAG PREP-EXTRA. That’s all you get, unless you call us and ask for more. The inserts will replace any stripped inserts in the tailgate ammo cans and studs or front face of the center vert at the bottle opener, but NOT THE TOP OF THE CENTER VERT. so hand tighten until snug only! You can also screw the inserts back in if dislocated. There is a straight screwdriver slot on the underside of the threaded insert.
Start all bolts with fingers to avoid cross-threading.
DON’T over tighten J-hooks during installation. Just get ’em good and snug: enough to keep the system from moving in the bed.
You will have leftover washers -you’re welcome.
Nice job if you’re still reading.

Prevent embarrassing, expletive-filled language, watch our detailed installation video or give us a call. We’re happy to help!

AMMO CAN DRAIN HOLES

TO DRILL OR NOT TO DRILL.)

Do you use a tonneau or shell over your DECKED system?
There is no need to drill holes, unless you leave your tonneau open in a deluge.
Does your DECKED system live outside?
The ammo cans will get water in them. You’ll need to drill holes in the ammo cans.
There are two dimples in the bottom of each ammo can. Drill a 1/2″ hole at each dimple. A smaller hole will get clogged.

PREP BED: MARK CENTER OF BED & SHIMS

Use a marking pen or wax pencil to mark a centerline (blue) on the raised center bead.
2 SHIMS can be found in your hardware kit.
Using the information below:

Clean the bed surface where the shims will be located. lsopropyl alcohol (do not drink) is recommended.
Remove tape film and apply shim with the strength ofl,000 men a.k.a push really hard.

PREP BED: CABSIDE TIE-DOWNS

NOTE: If your truck has the embossed logo on the cabside bulkhead, reverse the bracket installation order (flip them). For example, bolt-yellow- green-red-nut.

Sandwich the factory driver side tie-down (green) in between the cabside tie-down bracket (yellow) and the clamp plate (red); BAG PREP M63/M64.
Fasten securely through the circular holes with l” bolt and flanged nut; BAG PREP M63/M64.
Repeat passenger side.

ASSEMBLY: CENTER VERT+ CABSIDE VERT

NOTE: Perform the next few steps on a flat surface like a garage floor.

Attach center vert to cabside vert with four bolts. Alternate to tighten: BAG S1.

HELPFUL TIP : BAG S1, a.k.a “Fort Knox,” is required for most of the steps, so keep it close! These bolts are highlighted throughout instructions in RED.

ASSEMBLY: LOOSELY ATTACH STUDS (YUP)

LOOSELY attach studs to cabside vert with six bolts; BAG S1.

ASSEMBLY: ALIGN & TIGHTEN STUDS (YUP)

NOTE: This step ensures the studs are properly located before tightening bolts. It’s important.

Place ammo cans to support tailgate end of deck panels.
Lift deck panels on center vert +stud+ cabside vert assembly.
Slide studs around L-R until deck panels are seated.
DETAIL A: loosely secure four bolts to hold decks onto studs; BAB S1.
Now you can securely tighten the bolts that hold the studs to the cabside vert.
Unbolt deck from studs, remove deck panels, save bolts, remove ammo cans and set aside for later assembly.

HELPFUL TIP: This step seems like a waste of time, but Dr. DECKED says it’s important…don’t skip out.

ASSEMBLY: STUD BRACKETS

DETAIL A: Attach driver side stud bracket to driver side stud using three 3 1/2″ bolts and three flanged nuts into proper hole locations (green). Tighten secure Iv: BAG PREP MG3/MG4 · DETAIL B: Repeat steps in DETAIL A on passenger side.

ASSEMBLY: MOUNT ASSEMBLY

DETAIL A: While supporting both ends, lift center vert +stud+ cabside vert assembly in truck bed.
NOTE: Make sure centerline arrows on cabside vert are aligned with your centerline marks (blue).
DETAIL 8 : Place stud brackets cabside of cabside brackets (yellow). Loosely fasten with 3/4″ bolt and flanged nut: BAG PREP MG3/MG4.
Repeat passenger side.
Make sure assembly is still on centerline, then securely tighten both sides.

RECOMMENDED TORQUE: Bolts in labeled bag PREP MG3/MG4-53 in-Ib.

INSTALL: C-CHANNELS

IMPORTANT : There is a left and right ammo can. The inside of each ammo can is marked Lor R.

Loosely place driver side ammo can at tailgate corner of bed.
Place driver side C-channel on ledge of stud and ammo can with end plate cabside.
Install nylon washer only onto 4 S1 bolts and all 82 bolts: BAG WASHERS.
DETAIL A: Insert two bolts through C-channel into ammo can and loosely fasten with nut: BAG S2, BAG N1.
DETAIL B: Tightly attach C-channel to stud; BAG Sl.
Repeat passenger side.

INSTALL: DECK HALVES

Loosely place deck panel on side stud, center vert and ammo can.
Shift ammo can forward, rearward, L-R, as necessary to align with fully seated deck panel.
Loosely assemble:
- Five or six bolts (depends on bed length -NO WASHERS) through deck panel into center vert; BAG Sl.
- Four bolts with nylon and rubber washers installed as shown through deck panel into stud; BAG Sl, BAG WASHERS.
- Eight bolts with nylon and rubber washers installed as shown through deck panel into ammo can; BAG Sl, BAG WASHERS.
- Tighten all S1 bolts
- Securely tighten C-channel/ammo can nuts and bolts.
Repeat other side (making sure you don’t forget to securely tighten C-channel/ammo can nuts and bolts).
We have included extra washers -don’t worry if you have leftovers.

DRAWERS: BRACKETS+ WHEELS

Each drawer has a left and a right bracket. Bolt brackets into place via bottom two holes in bracket with 3/4″ length bolts. Use the 2″ length bolt for the upper cab side wall hole in bracket; BAG DRAWER 1.
Install a tube brace in each drawer with two 3/4″ length bolts; BAG DRAWER 1, BAG DRAWER 2.
Attach wheels onto drawer brackets with a 7/32″ hex wrench: BAG WHEELS

DRAWERS: AXLE WHEELS+ WEATHERSTRIPS

Slide narrow drawer into driver side drawer cavity.
NOTE: It is easier to fully install narrow drawer first.
DETAIL A : Install two tailgate wheels onto narrow drawer axles with a 7/32” hex wrench; BAG WHEELS.
Repeat with wide drawer.
DETAIL B: Install weather strips on top of drawer edges WITH WIPER BLADE POINT/NB TOWARD DRIVER.
IMPORTANT: Facing the weather strip the wrong way will funnel water into drawer: BAD!

RECOMMENDED TORQUE: Wheel bolts -90 in-lb.
HELPFUL TIP: To make this step easier, jam a 2″ piece of material under drawer, or get your pal to pinch the drawer up to the deck to give you better leverage.
HELPFUL TIP: Cut weather strips if they overhang.

THE FUN STUFF: TORSION BRACE +BOTTLE OPENER

Slide torsion brace under center vert and tailgate ammo cans.
Loosely install:
- Two 1/2″ length bolts through upper holes in bottle opener into center vert; BAG FINAL MID.
- Two bolts with nylon washers through the end holes in torsion brace into ammo cans; BAG S1.
- Two bolts with nylon washers through the bottom bottle opener holes and torsion brace into center vert; BAG S1.
Align bottle opener to edges of center vert and tighten four bottle opener bolts.
Tighten end bolts into tailgate ammo cans.

INSTALL: J-HOOKS

Install J-hook onto tie down bracket and through the second hole closest to the tailgate in ammo can: BAG J5.
Install winged-spherical nut-washer, round side down, onto J-hook and partially tighten using your fingers only.
IMPORTANT: Keep J-hook assembly loose.
Repeat other side.
Tighten the J-hooks, but DO NOT OVER TIGHTEN! Make sure the gap between the side wall of the bed and the deck is equal on both sides.
Install bolt thread protectors on J-hook ends; BAG FINAL MID.

HELPFUL TIP: Make sure the hooks open toward tailgate.

IMPORTANT: You’re almost there, so get your favorite beverage ready to crack open in the bottle opener and make a toast to your truck. When finished, immediately post a photo of your significant other, child or canine (in no order of significance please someone show us your pet alligator) appreciating your accomplishment.
Add hashtag #DECKEDUSA I @DECKEDUSA.

FINAL STEPS: THE RULER

Install ruler with six 1/8″ hex screws; BAG FINAL MID. Start screws with fingers to avoid cross-threading. Tighten just until snug. Overtightening will strip the inserts.

FINAL STEPS: AMMO CAN

DETAIL A: Ammo can lids are left (marked U and right (marked R) side specific.
DETAIL B: Holding lid in orientation shown, insert tab on tailgate end of ammo can lid and push the cabside end of lid down to secure. Don’t be afraid to push down hard.
Insert lock hole plugs, unless you are fining the optional drawer locks, in which case install drawer locks now (instructions with locks); BAG FINAL MID.

DECKED 3-YEAR LIMITED WARRANTY

And now …. a word from our lawyers.

DECKED LLC warrants to the original purchaser of this product that the product will be free from manufacturing defects in workmanship and materials for a period of three (3) years from the date of the original purchase. If within three (3) years from the original date of purchase this product fails due to defect in materials or workmanship, DECKED LLC will replace any defective part at its option.
The original purchaser must contact the DECKED LLC customer service team and provide a description of the defective part, including digital pictures if requested, with the original purchase documentation as validation of warranty coverage or have previously activated their warranty online.
This warranty DOES NOT cover or apply to:

Damage to the product due to misuse, mishandling and abuse.
Products not used in accordance with the manufacturer’s instructions or recommendations.
Product not assembled or installed according to manufacturer’s instructions.
Normal wear and tear.
Undeclared damage to the system during shipping, acts of God. In addition, consequential damage and incidental damages (including lost time) such as damage to persons or property are not covered under this warranty.