Improperly Tightened Wheel Lug Nuts – 2023-2024 Stoughton Intermodal Container Chassis

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-426 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Stoughton Trailers, LLC Submission Date : JUN 14, 2023 NHTSA Recall No. : 23V-426 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Stoughton Trailers, LLC Address : 416 South Academy Street Stoughton WI 53589-0606 Company phone : 608-873-2500 Population : Number of potentially involved : 1,152 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2024 Stoughton Trailer Intermodal Container Chassis Vehicle Type : TRAILERS Body Style : OTHER Power Train : NR Descriptive Information : Population was determined by identifying when issue occurred to when the manufacturing plant stopped shipping suspect units to customer. This is the only product built at this manufacturing plant. Production Dates : MAR 08, 2023 – MAY 23, 2023 VIN Range 1 : Begin : 1DW4C5327PWB22345 End : 1DW4C5323RWB64532 ✔ Not sequential Description of Defect : Description of the Defect : Inadequate wheel lug nut torque FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Potential loss of wheel during transit Description of the Cause : NR Identification of Any Warning that can Occur : NR Involved Components : Part 573 Safety Recall Report 23V-426 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : NR Component Description : NR Component Part Number : NR Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : Received report of wheel loss on 5-24-2023. Secured all units from shipping to customer 5-24-2023. Started investigation at manufacturing plant of potential cause with no evident root cause. An additional wheel off report was received 6-8-2023 with evidence of units with low wheel lug nut torque readings at the customers location which prompted additional investigations at their yards which resulted in additional units identified with low wheel lug nut torque. Description of Remedy : Description of Remedy Program : All wheel lug nuts will need to be checked for adequate torque values and corrected to proper value. All reimbursements submitted to Stoughton Trailers will be processed through our accounting department for reimbursement. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : 5-24-2023 A redundant torque inspection process was put in place in addition to torque process audits for final inspection of the wheel lug nut. Recall Schedule : Description of Recall Schedule : NR Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : JUN 26, 2023 – JUN 27, 2023 Part 573 Safety Recall Report 23V-426 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 * NR – Not Reported

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…The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 1 of 7 Document ID Revision A Revised By CH Approved By ADA A. Purpose: This work instruction provides steps on how to inspect and replace hubs, hub studs and lug nuts to prevent damage to components caused by not torquing lug nuts to specifications. B. Scope: This document is to be referenced in the case that loose lug nuts have been discovered on a chassis to determine whether any repairs need to be done and the procedures to follow if repairs are needed. C. Contact Information: If you have any questions about this Repair Document, please contact the Stoughton Trailers Customer Service Department by toll free at (866)-725-0044 or by email ([email protected]). D. Approximate Inspection Time: 10 – 60 minutes E. Inspection Instruction 1. Issue 1.1. Loose lug nuts can lead to major failures of chassis components. If lugs are not torqued to specifications, this can lead to significant wear on hubs, wheels and studs that will eventually lead to stud/hub failure and therefore a wheel off event. 2. Signs of Loose Lug Nuts 2.1. Wear on wheel/paint defects, Red Arrow 2.1.1. The lug nut can appear tight upon inspection, but any defects in paint or inconsistent paint alignment marks are a sure sign that lugs are not fully torqued. If any defects are noticed, the wheel must be removed for hub/perform hub/stud inspection. If no damage is found, torque all lug nuts to specifications and continue to check consistently. 2.2. Lugs have backed off or are missing, Blue Arrow 2.2.1. If Lugs appear loose upon inspection or are missing, the wheel must be removed to check hub/hub studs for damage. …The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 2 of 7 Document ID Revision A Revised By CH Approved By ADA 3. Stud inspection 3.1. Visual Inspection. Remove wheel. Once the wheel is off, visually inspect studs for any signs of wear, discussed below. 3.2. Physical Inspection. Test for thread damage by installing a lug nut by hand on each stud until it bottoms out on the hub. If any noticeable resistance is found, replace the stud. Signs of thread damage can be seen below. Upon inspection, if any stud appears to have been bent, unseated, necked, stripped, broken or is missing from the hub, it must be removed, and further inspection of the hub must follow. An example of damaged, corroded, stripped and necked studs is shown below. …The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 3 of 7 Document ID Revision A Revised By CH Approved By ADA Physically feel each stud by attempting to move it to check that they are tight in the hub. If any studs are loose in the hub, see section 4. A missing and broken hub stud can be seen below. If the stud appears bent or deformed on either side of the hub, this can lead to damage of the stud seats, as seen below, which will lead to loosening of lug nuts and eventually hub failure. Therefore, the stud must be removed. 3.3. Stud Replacement. If any wear is present, the damaged stud and one stud on either side of it at the minimum must be replaced (3 studs). NOTE: Two or more damaged studs requires all studs to be replaced and hub inspected. 4. Hub Inspection 4.1. Remove any studs in question. 4.2. Visual Inspection. Look over the outside of the hub for any sign of damage such as fractures, a damaged mounting face, excessive corrosion etc. If damage is done to so much as one stud seat, pictured below, there is a risk of compromising the whole hub assembly which could lead to a wheel off event and significant damage and/or safety concerns. After removing each stud, inspect the spline pattern on each of the stud seats for the corresponding stud. If these internal splines are chipped, broken, worn, or missing, the replacement stud will not seat properly. Broken Hub Stud Missing Hub Stud …The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 4 of 7 Document ID Revision A Revised By CH Approved By ADA 4.3. If as little as one stud seat is found to be damaged after visual inspection, replace the hub. 4.4. If visual inspection shows there were any studs loose before disassembly, or the inspector sees the hub unsafe to use, replace the hub. 4.5. Identify Hub Manufacturer & refer to reference documents below. 5. Lug Nut Torque Certification 5.1. When lug nuts are torqued to the required value found in the manufacturer’s specifications in section 7, mark with a red mark as shown below. Hub Stud Internal Spline Pattern …The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 5 of 7 Document ID Revision A Revised By CH Approved By ADA 5.2. Paint a small green dot on the body of the chassis on the roadside suspension as shown below. …The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 6 of 7 Document ID Revision A Revised By CH Approved By ADA 6. Inspection Certification Ribbon 6.1. Once the unit has been inspected and repaired, secure a blue ribbon to the curbside front as shown in the photo below. 7. Reference Documents 7.1.1. Wheel Stud Replacement 7.1.1.1. How to Replace Wheel Bolts on CONMET Hub Assemblies 7.1.2. Hub Assembly Replacement 7.1.2.1. CONMET Hub Service Manual; Conventional, PreSet, PreSet Plus, Hub & Rotor 8. Part Numbers 8.1. Conmet: 8.1.1. Lug nut: 10083845 8.1.2. Wheel Stud: 10001399 8.1.3. Hub Assembly: 10085616 8.2. AXN 8.2.1. Lug Nut: 8.2.2. Wheel Stud: H33-0341 8.2.3. Hub Assembly: 9. Tool List 9.1. Stud Replacement: 9.1.1. Commercial Wheel Stud Replacement Kit OR 9.1.2. Hammer 9.1.3. Lug Wrench & Socket 9.1.4. Impact Driver …The Difference is Quality Inspection Instruction For Wheel Hub, Studs and Lug Nuts 06/08/2023 Page 7 of 7 Document ID Revision A Revised By CH Approved By ADA 9.1.5. 0.002” Feeler gauge 9.2. Hub Replacement: 9.2.1. See Reference Documents

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-426 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Stoughton Trailers, LLC Submission Date : JUN 22, 2023 NHTSA Recall No. : 23V-426 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Stoughton Trailers, LLC Address : 416 South Academy Street Stoughton WI 53589-0606 Company phone : 608-873-2500 Population : Number of potentially involved : 1,152 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2024 Stoughton Trailer Intermodal Container Chassis Vehicle Type : TRAILERS Body Style : OTHER Power Train : NR Descriptive Information : Population was determined by identifying when issue occurred to when the manufacturing plant stopped shipping suspect units to customer. This is the only product built at this manufacturing plant. Production Dates : MAR 08, 2023 – MAY 23, 2023 VIN Range 1 : Begin : 1DW4C5327PWB22345 End : 1DW4C5323RWB64532 ✔ Not sequential Description of Defect : Description of the Defect : Inadequate wheel lug nut torque FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Potential loss of wheel during transit which could cause injury Description of the Cause : NR Identification of Any Warning that can Occur : NR Involved Components : Part 573 Safety Recall Report 23V-426 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : lwheel lug nut Component Description : NR Component Part Number : NR Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : Received report of wheel loss on 5-24-2023. Secured all units from shipping to customer 5-24-2023. Started investigation at manufacturing plant of potential cause with no evident root cause. An additional wheel off report was received 6-8-2023 with evidence of units with low wheel lug nut torque readings at the customers location which prompted additional investigations at their yards which resulted in additional units identified with low wheel lug nut torque. Description of Remedy : Description of Remedy Program : All wheel lug nuts will need to be checked for adequate torque values and corrected to proper value. All reimbursements submitted to Stoughton Trailers will be processed through our accounting department for reimbursement. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : 5-24-2023 A redundant torque inspection process was put in place in addition to torque process audits for final inspection of the wheel lug nut. Recall Schedule : Description of Recall Schedule : no dealers or distributors are involved Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : JUN 26, 2023 – JUN 27, 2023 Part 573 Safety Recall Report 23V-426 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 * NR – Not Reported

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