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INSTALLATION PROCEDURE

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1. Attach both left and right side rails to the truck bed.  The end of the mounting rail with the drain tube fitting 

will go towards the cab of the truck, position flush to bulkhead. Position the top edge of the mounting rail 

flush to 1/8" above the top edge of your truck bed rail.

2. Starting with a smaller center clamp, slide the clamp force spreader onto the clamp, install to the rail, but do 

not tighten completely.  Install the other smaller clamp at the front, with a force spreader, near the bulkhead. 

Install the larger clamp at the rear by placing the back portion of the clamp into the stake pocket. 

Stick each one of the rubber filler strips to the bed rail, adjacent to the front and middle clamps, prior to install-

ing the mounting rail, see the figure below.

3. Tighten the clamps using a 1/2” socket. 

4. Install the stake pocket covers by snapping them into the stake pocket holes.

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3

Warning! 

Do not overtighten the clamp assem-

bly. A torque wrench is not necessary. 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 Specific 

Clamp Assembly

Rubber Filler Strip

Clamp Force Spreader

Truck Bed Rail

Rail Spacer

Cover Mounting Rail

4

1/2”

Adjustable 

Position

Summary of Contents for TFX1523

Page 1: ...IS NOT NECESSARY IF PREFERRED TORQUE IS APX 75 INCH LBS www TrailFX com Tools Required Qty Part Description Qty Part Description Components Rev 041015 Page 1 of 7 TFX1523 Chevy Silverado GMC Sierra 5...

Page 2: ...he larger clamp at the rear by placing the back portion of the clamp into the stake pocket Stick each one of the rubber filler strips to the bed rail adjacent to the front and middle clamps prior to i...

Page 3: ...s 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 Bul...

Page 4: ...rrectly 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 mountin...

Page 5: ...to the fittings 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...

Page 6: ...gate 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...

Page 7: ...to be defective and specifically 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 p...

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