SFN-20240112B Replace pivot blocks

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TICO Document #: SFN-20240112B (formerly TES 149)

Description of Procedure: Variations in the forming and welding process may cause the mounting surface of the frame that the pivot block attaches to become uneven preventing proper mounting of cab pivot block. Areas of the frame rail at the locations of the cab pivot blocks must be have a smooth, flat finish.

Units Affected: All units manufactured before July 2015.

Parts Required: Roll pin, 3/8” 40018 (QTY 4)

Planned Labor: 3 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. Remove 3/8-16 x 1 1/4” bolts, washers, and nuts securing the grill to front cross member.

  1. If installed, remove pigtail connections for grid heater to grill, mark wires so that they may be reinstalled to the same terminals, green wire should always be located at ground.

  2. Set grill aside for now. Retain hardware.

  1. Raise cab slightly, using an appropriate lifting device, to remove pressure on cab pivot pins.

  2. Remove cab pivot pin on left-hand side. Retain pin and discard roll pins.

  3. Raise front of cab floor slightly and insert blocks under front edge of cab floor to support cab during repair.

  1. On left-hand side of unit, remove cab pivot plates attached to cab floor, shown above.

  1. Remove cab pivot block. Retain 3/4-10 x 3” long bolts, washers and nuts as well as 1/2 washer and 1/2-20 nut. • Using a belt sander with a 40 grit surface, sand surface at mounting location of cab pivot block until it is smooth and level.

  1. Inspect cab pivot block for defects. If found, replace cab pivot block.

  2. Install cab pivot block onto level surface using hardware previously removed.

  3. Tighten hardware securing cab pivot block to frame rail.

  1. Using a 0.010” filler gauge, verify that there is no clearance between frame rail and bottom surface of cab pivot block. If filler gauge passes between rail and bottom surface of cab pivot block, repeat previous steps until clearance has been reduced to less than 0.010”.

  2. Remove cab pivot block and paint exposed metal with rust-inhibitive primer and paint, allowing to dry.

  3. Reattach cab pivot block and tighten hardware.

  1. Reattach cab pivot plates to cab floor using 5/8-11 x 6” long bolts, washers, and nuts previously removed. Torque nuts to 125 ft.*lbs.

  1. Lift front of cab floor and remove support blocks.

  1. Lower cab into place and insert pivot pin. Use new 3/8” roll pins to secure pivot pin into place.

  1. Repeat process on right hand side of unit. Once paint dries, install cab pivot block leaving the hardware loose.

  1. Adjust cab floors location so that cab floor guide is centered around the left-hand cab bar mounting plate as shown. Tighten right hand side cab pivot block.

  1. Torque 3/4-10 cab pivot block mounting hardware to 230 ft.*lbs.

  1. Torque 1/2-20 cab pivot block mounting hardware to 50 ft.*lbs.

  1. Verify clearance of between cab pivot block and frame rail using 0.010” filler gauge.

  1. Raise and lower cab several times to ensure cab pivot blocks are seated properly.

  1. Reattach grill and grid heater connections, if installed.

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

  1. Return vehicle to service.