SFN-20240122B Rerouting harnessess between frame and C.A.C pipe

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TICO Document #: SFN-20240122B (formerly TES 129)

Description of Procedure: Routing of harnesses between frame and C.A.C. pipe not consistently done with adequate clearance with frame. Revised routing of harnesses to use a “C” shaped standoff bracket to secure cables away from frame rail and prevent chaffing.

Units Affected: Tractors built between May 2013 to February 2014

Parts Required: Standoff bracket ‐ “C” Various sized tie straps (as needed) 62265 (QTY 1)

P‐clamp, 5/8” 91148 (QTY 3)

P‐clamp, 1/2” 91147 (QTY 1)

1/2” tube push‐on to 1/2” MNPT straight fitting (QSB, 1 required) 40885 (QTY 1)

1/2” air brake line (QSB, 3’ required) 1/2” Convoluted Tubing (QSB, 3’ required) 11005 (QTY 1)

Planned Labor: 2 hour

Instructions:

  1. Park vehicle on flat surface, apply parking brake, and chock wheels. If your company utilizes a “Lock Out, Tag Out” policy, you should employ it during this procedure.

  2. Raise cab to its highest position and secure with cab safety latch, utilizing the top groove in latch.

  3. Locate and remove P‐clamps securing 4 wires to standoff bracket, pictured above.

  4. Remove “butterfly” tie straps securing wiring harnesses to each other as well as tie straps that are securing the harnesses to frame rail and engine cradle.

Screen Shot 2024-01-22 at 2.37.34 PM

  1. Lower cab to horizontal position.

  2. With another technician, remove standoff bracket previously used to secure P‐ clamps by removing bolt on left‐hand side of brake pedal. Reinstall bolt, washers, and nut once standoff bracket is removed. Torque to 18 ft‐lbs.

  3. Raise cab to highest position and re‐engage cab safety latch at the top groove

  1. Remove 5/16”‐18 x 1/2 LG serrated flange head bolt from top left-hand side of radiator.

  2. Turn CAC pipe’s hose clamps downward so as not to interfere with standoff bracket.

  3. Install “C” shaped standoff bracket, P/N: 62265, as shown, using removed flange head bolt. Tighten flange head bolt.

  4. Pull excess length of wiring harnesses, tucked into frame rail, toward front of tractor.

  5. Attach wiring harness to standoff bracket using 3 P‐clamp, 5/8”, and 1 P‐clamp, 1/2”

  1. Ensure adequate clearance of wiring harnesses between frame rail and CAC.

  1. Bundle wires going into cab floor with tie straps and ensure adequate length of loop to prevent wire stretching and provide clearance from steering shaft when cab is tilted.

  2. Tighten P‐clamps.

  1. For QSB tractors, remove 1/2” air brake line running to 45° fitting pictured above.

  2. Replace 1/2” tube push‐on x 1/2” MNPT 45° fitting with 1/2” tube push‐on x 1/2” MNPT straight fitting, P/N: 40885.

  1. For QSB tractors, remove existing 1/2” air brake line routed from air manifold to foot valve shown above.

  1. Replace with 3’ air brake line, 1/2” routed as shown. Trim excess air line as necessary.

  2. Wrap air brake line in 1/2” convoluted tubing. Trim excess tubing as necessary.

  1. Bundle and secure wire harnesses with tie straps as necessary to prevent chafing

  2. Secure harnesses within frame rail from chaffing on hoses and fittings.

  3. Test Harness routing by raising and lowering the cab several times, ensuring that the wires are not chaffing against air lines or steering shaft.

  1. Remove “Lock Out, Tag Out” plaque.

  1. Return vehicle to service.

  1. Discard the standoff bracket that was removed. On QSB tractors, discard 45° air line fitting and air brake line that were removed.