TrailFX TFX3521 User manual

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PARTS LIST OF COMPONENTS
Tri-Fold Tonneau Cover
Fits:
Ratchet & 1/2” Socket
THE TRAILFX TRI-FOLD TONNEAU COMES FULLY ASSEMBLED.
30-60 min Cutting Not Required Drilling Not Required
REMOVE CONTENTS FROM BOX. VERIFY ALL PARTS ARE PRESENT.
[email protected]
1 866 638 4870
LIMITED LIFETIME WARRANTY
READ INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION.
DO NOT OVER TORQUE. A TORQUE WRENCH IS NOT NECESSARY.
IF PREFERRED, TORQUE IS APX 75 INCH LBS.
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Tools Required
Qty Part Description Qty Part Description
Components
Rev 040915Page 1 of 7
TFX3521 - Ford F150 5.5’ 2004-2014
TFX3522 - Ford F150 6.5’ 2004-2014
TFX3524 - Ford F150 5.5’ 2015-2017
TFX3525 - Ford F150 6.5’ 2015-2017
TFX3523 - Ford F250/F350 6.5’ 2008-2016
TFX2522 - Ram 5.5’ 2009-2017
KS-M2
1
2
3
4
5
6
7
Hard Folding Cover
Driver (Left) Mounting Rail
Passenger (Right) Mounting Rail
Drain Tubes (x2)
Clamps (x6)
Star Knobs (x4)
Lock Washers (x4)
8
9
10
11
Flat Washers (x4)
Front Mounting Retainer (x4)
Front Mounting Bolts (x4)
Bulkhead Seal
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Page 2 of 7
INSTALLATION PROCEDURE
1
1. Attach both left and right side rails to the truck bed. The end of the mounting rail with the drain tube tting
will go towards the cab of the truck, position ush to bulkhead.
2. Position the top edge of the mounting rail ush to 1/8" above the top edge of your truck bed rail.
3. Using three (3) clamps per side attach the rail to the bed, position the clamps adjacent to each of the black
rail spacers. (Tip: Mount the center clamp rst but do not tighten completely. This will give you the ability to
adjust the rail as the outer clamps are attached)
4. Tighten the clamps using a 1/2” socket. Install the bulkhead seal to the top of the front rail of the truck bed
and cut to length.
2
3
Warning! Do not overtighten the clamp
assembly. A torque wrench is not neces-
sary. If preferred, torque is apx 120 inch
lbs.
Warning! Clamps must be checked
periodically for tightness. Failure to do so
could result in damage to you or your
property.
Truck Specic
Clamp Assembly
Truck Bed Rail
Rail Spacer
Cover Mounting Rail
Adjustable Position
4
1/2”

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Page 3 of 7
5
5. Set the tonneau onto the mounting rails, the buckles should be to the front.
6 & 7. Assemble the four retainer clamps, slide each of them into the track on the underside of the tonneau,
slide into position, but do not tighten at this time.
6 7
Bulkhead
Front Flap
Cover
Warning - Be sure Front ap is over the bulkhead

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Page 4 of 7
8
10 11
9
8. Carefully unfold the cover. Position the cover so it is centered side to side and front to back on the truck bed.
9. Test the rear latching assembly for smooth operation as this is the best indicator of the cover being posi-
tioned correctly. Be sure the latches on both sides are engaging with the cover mounting rail.
Note: If your truck is equipped with a tailgate protector, you may need to slightly raise the rear of the side mounting
rails for the latches to engage properly.
10 & 11. Once the cover is located correctly, fold the cover to the open position. Pull the release cables on the
rear panel to release it from the side rail. Take care to fold it gently so the position of the cover is not
disturbed.

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12 13
14
12 & 13. Once in the open position double check the clamp engagement to the side rail and tighten. Test the
cover again for proper operation, adjust as needed, then tighten the star knobs.
14. Attach the drain tubes to the ttings at the front of the bed rail and position the tubes to divert water out
of the truck bed. This can be done by placing the tube behind a bed liner, through an existing hole in the bed,
or by drilling a 5/8” hole in the bulkhead.
Note: If you choose to place the tube behind your bedliner, be sure your drain holes in the bed are not clogged.
Note: If you choose to drill holes, be sure to clean up the metal shavings.
Page 5 of 7

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OPERATION INSTRUCTIONS
12
345
1 & 2. To open the cover: Lower the tailgate and pull the cable. While pulling on the cable lift the panel up
and towards the cab.
3, 4 & 5. Release the strap from the stowed position by squeezing the tabs. Attach the buckle at the bulk-
head, pull the strap to take up the slack and secure the cover. Repeat this for the opposite side.

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Page 7 of 7
• Clean with soap and water only.
• Cover must be secured when vehicle is in motion. See instructions for recommended driving positions.
An unsecured cover can result in damage not covered by this warranty.
PRODUCT CARE
Keystone Automotive Operations Inc. (KAO) warrants this product to be free of defects in material and
workmanship at the time of purchase by the original retail consumer. KAO disclaims any other warranties,
express or implied, including the warranty of tness for a particular purpose or an intended use. If the
product is found to be defective, KAO may replace or repair the product at our option, when the product
is returned prepaid, with proof of purchase. Alteration to, improper installation, or misuse of this product
voids the warranty. KAO’s liability is limited to repair or replacement of products found to be defective,
and specically excludes liability for any incidental or consequential loss or damage. The repaired or
replaced tonneau will be in warranty for the remainder of the original warranty period.
WARRANTY COVERAGE
1. How dicult is it to install the tonneau cover?
Installing of tonneau cover is easy, please follow the steps in installation manual carefully.
2. How do I clean my tonneau cover?
Wash the tonneau same as your truck. We recommend using soap and water.
3. Will the tonneau cover scratch my paint?
No. Please follow the installation instruction manual carefully to avoid scratching paint.
4. Will the tonneau cover obstruct the opening and closing of my tailgate?
No. The tailgate must be closed before latching the tonneau.
5. Missing or Excess Hardware?
Re-check hardware count as per the part list.
6. Why is my tonneau cover not installing properly?
Ensure year, make, model, cab length and bed size of your vehicle is listed in the application and installa-
tion steps are followed correctly.
FAQ
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