U-Bolts Securing Front Axle May Fail – 2019-2022 Oshkosh S-Series

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1 SAFETY NOTICE Vehicle Safety Recall – Technical Service Bulletin PROMPT ACTION REQUIRED Attention: Subject: Models Affected: Model Year: Date: Oshkosh Product Owner Front Axle U-Bolts Oshkosh S-Series Front Discharge Mixer 2019-2022 (VIN 788727 – 814106) February 2022 VSR-TSB-034 NHTSA Campaign Number: 22V-009 Purpose: A concern affecting safety exists in some Oshkosh S-Series Front Discharge Mixers. Vehicles have been identified that are equipped with front axle U-bolts that were manufactured incorrectly and do not meet the required material specifications. The defect may cause the front axle U-bolts to loosen or fall off, resulting in the front axle shifting or the axle becoming dislocated from the vehicle. This bulletin provides instruction on replacing the front axle U-bolts. Affected Vehicles: The affected vehicle population is Oshkosh S-Series Front Discharge Mixers produced in 2018-2021. Units Affected: VIN 788727 – 814106 Please refer to the attached VIN list of affected vehicles. Time Completion: Complete the enclosed procedure for each affected vehicle. The time of accomplishment may vary due to a number of factors; however, the estimated time for replacement is 1.5 hours. Required Action: Review and verify your ownership of all affected serial numbers of Oshkosh vehicles. Oshkosh records indicate that you are the owner of one or more affected vehicles, a Serial Number List is enclosed. Please be reminded that it is a violation of Federal law for you to sell or lease the vehicles covered by this notification until this recall has been performed on these vehicles. Substantial civil penalties apply to violations of this law. Reimbursement of Costs: Affected vehicles shall be repaired using the customer’s own qualified service technicians – at no cost to the owner. The repair should take approximately 1.5 hours. Parts/Labor Reimbursement: In order to receive credit, claims are to be submitted through the normal warranty claim system. Claims must be received within 30 days of the repair. Claims must include the Oshkosh VIN of the vehicle, the customer asset number, and the number of this bulletin. 2 Contacts: If you have questions or need further information, please contact S-Series Service Support at 888-686-7278 Enclosures: Procedure VIN List of Affected Vehicles Parts Required: Item Part Number Description Qty. 1 A000W413 U-BOLT 5.00 X 8.50 X 0.88-14 SQR PO 4 2 A000W497 WASH, LK, SPLIT 0.88 X 1.57 X 0.29 PO 8 3 A000W480 NUT, HEX 0.88-14 G8 PO 8 SAFETY NOTICE Perform your company’s Lockout/Tagout procedure. If your company does not have a Lockout/Tagout procedure, follow OSHA 1910.147 and 1910.146 Confined Space as appropriate. SAFETY NOTICE Use appropriate Personal Protective Equipment (PPE) as required by your company. Procedure Preparation 1. Park truck on flat, level surface, engage parking brake, chock truck tires, and perform your company’s Lockout/Tagout procedure. If your company does not have a Lockout/Tagout procedure, follow OSHA 1910.147 and 1910.146 Confined Space as appropriate. 2. Battery Disconnect Switch The vehicle’s BATTERY DISCONNECT switch is located on the left-hand side of the battery box. Use the battery disconnect switch when performing any maintenance so the vehicle cannot accidentally be started. a. Turn the battery disconnect switch (Figure A, Item 1) counterclockwise so the hole on the switch aligns with the hole in the bracket (Figure A, Item 2). b. Install the safety lockout device ring (Figure B, Item 1) through the holes on the battery disconnect switch and the bracket. c. Install a padlock (Figure B, Item 2) onto the safety lockout device ring, lock it, and put the key in your pocket. If more than one person is working on the vehicle, each person must install his or her own padlock. Figure A DANGER This energy source has Unauthorized removal of this lock/tag may result in immediate discharge. Remarks: been LOCKED OUT! Figure B 1 2 1 2 3. Place jack stands under vehicle’s front frame. 3 U-Bolt Replacement NOTE Remove and replace front axle U-bolts one at a time. 4. Loosen and remove nuts and lock washers from one U-bolt, see Figure 1. Nuts and lock washers will not be reused. 5. Remove U-bolt from axle and spring assembly, see Figure 1. U-bolt will not be reused. Figure 1 U-Bolt Lock Washers Nuts 6. Install new U-bolt (A000W413) over spring assembly and into axle flange, see Figure 2. 7. Install new lock washers (A000W497) and nuts (A000W480) on U-bolt, see Figure 2. Snug nuts on U-bolt, do not final tighten at this time. Figure 2 U-Bolt (A000W413) Lock Washers (A000W497) Nuts (A000W480) 8. Repeat Steps 4 – 7 for remaining three front axle U-bolts. 4 Continuous Improvement: The change included in this document is part of the McNeilus Continuous Improvement Process. McNeilus’s quality policy is providing customer satisfaction through innovative products, dedicated service, and a constant focus on continuous improvement. (888) 686-7278 www.streetsmartparts.com 9. Tighten left and right U-bolt groups evenly using 200 ft. lbs. increments to 600 ft. lbs. Follow torque sequence in Figure 3. Figure 3 1 2 3 4 Front of Truck 10. Remove jack stands from vehicle’s front frame. 11. Remove lockout/tagout and tire chocks.

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Oshkosh Corporation 2307 Oregon St., Oshkosh, WI 54902 • (920) 235-9150 February 2022 IMPORTANT SAFETY RECALL 22V-009 Dear Oshkosh Vehicle Owner: Ref: NHTSA U-Bolts Securing Front Axle May Fail 22V-009 VIN: <<NOTE: Either insert VIN or reference attached VIN list>> This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Oshkosh has decided that a defect which relates to motor vehicle safety exists in your Oshkosh S-Series Front Discharge Mixer. These vehicles were built between 2018-2021. Why is a recall being conducted? A concern affecting safety exists in some Oshkosh S-Series Front Discharge Mixers. Trucks have been identified that are equipped with front axle U-bolts that were manufactured incorrectly and do not meet the required material specifications. The defect may cause the front axle U-bolts to loosen or fall off, resulting in the front axle shifting or the axle becoming dislocated from the vehicle. This bulletin provides instruction on replacing the front axle U-bolts. What are we doing about the problem? Oshkosh will provide customers with Instructions on how to install a new front axle U-Bolts. Customers would purchase the parts, perform the repairs, and then file parts/labor reimbursement through normal warranty process. Customers can also choose to have an Oshkosh service center perform the inspection and repair work free of charge. ! I M P O R T A N T ! ➢ Your Oshkosh vehicle is being recalled. ➢ Contact Oshkosh at 1-888-686-7278 for any questions. ➢ This recall repair will result in no cost to you. Oshkosh Corporation 2307 Oregon St., Oshkosh, WI 54902 • (920) 235-9150 What should you do? • Repairs should take less than 1.5 hours. • Customers can also choose to have an Oshkosh service center perform the inspection and repair work free of charge. What if you no longer own this vehicle? If you no longer own this vehicle, please contact Oshkosh at 1-888-686-7278 to assist us in updating our records. Who should you contact if you have further questions or concerns? If you have further questions, please contact Oshkosh at 1-888-686-7278 to allow us to assist you. If you have leased this vehicle to another person, federal regulations require you to send a copy of this notice to your lessee by first-class mail within ten days of your receipt of this notice. If Oshkosh fails or is unable to remedy this defect without charge and within a reasonable time, you may submit a written complaint to: The Administrator, National Highway Traffic Safety Administration 1200 New Jersey Avenue, SE., Washington, DC 20590; or call the toll-free Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to http://www.safercar.gov. We apologize for any inconvenience this safety recall may cause, but your safety is our first concern. Sincerely, OSHKOSH CORPORATION

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-009 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Oshkosh Corporation Submission Date : MAR 02, 2022 NHTSA Recall No. : 22V-009 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Oshkosh Corporation Address : 2307 Oregon Street PO Box 2566 Oshkosh WI 54903-2566 Company phone : 920-235-9151 Population : Number of potentially involved : 1,268 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2019-2022 Oshkosh S-Series Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : ALL Power Train : DIESEL Descriptive Information : Oshkosh determined through investigation that the bolts securing the front axle did not meet the required specifications as designed. Production Dates : SEP 13, 2018 – NOV 29, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Suspect bolts securing the front axle do not meet material properties as originally designed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Bolts that do not meet the material specifications and where the material is not sufficiently hard, have the potential to loosen or fail over time and may allow the front axle to shift or come loose and in an extreme case if the condition is not corrected, the front axle could detach from the vehicle. This could increase the risk of a crash. Description of the Cause : Incorrectly manufactured bolts that did not meet material specifications as noted on the Engineering drawing. Identification of Any Warning that can Occur : Noise coming from the area of the front axle may indicate the axle shifting and loose bolts. Involved Components : Part 573 Safety Recall Report 22V-009 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : U-Bolt Component Description : U-Bolt Component Part Number : A000A335 Supplier Identification : Component Manufacturer Name : Component Engineering Address : 1610 Independence Ave Hartford Wisconsin 53027 Country : United States Chronology : Not enough space to put all in here. See miscellaneous document Description of Remedy : Description of Remedy Program : Oshkosh will send new u-bolts that meet material specifications and that will secure the front axle properly. This will be done at no cost to the customer. Customers would submit a claim through the normal warranty process for reimbursement. How Remedy Component Differs from Recalled Component : The correct hardware will meet material properties as originally designed. Identify How/When Recall Condition was Corrected in Production : Production will be installing corrected U-bolts. This change was made in production on November 30th, 2021. A new Oshkosh PN was created to aid this cut-in. Recall Schedule : Description of Recall Schedule : Notifications to customers will be made via a customer letter. The 577 customer letter will be mailed pending NHTSA approval. Oshkosh does not distribute vehicles through dealers. Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : FEB 24, 2022 – FEB 24, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-009 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Oshkosh Corporation Submission Date : FEB 24, 2022 NHTSA Recall No. : 22V-009 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Oshkosh Corporation Address : 2307 Oregon Street PO Box 2566 Oshkosh WI 54903-2566 Company phone : 920-235-9151 Population : Number of potentially involved : 1,268 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2019-2022 Oshkosh S-Series Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : ALL Power Train : DIESEL Descriptive Information : Oshkosh determined through investigation that the bolts securing the front axle did not meet the required specifications as designed. Production Dates : SEP 13, 2018 – NOV 29, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Suspect bolts securing the front axle do not meet material properties as originally designed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Bolts that do not meet the material specifications and where the material is not sufficiently hard, have the potential to loosen or fail over time and may allow the front axle to shift or come loose and in an extreme case if the condition is not corrected, the front axle could detach from the vehicle. This could increase the risk of a crash. Description of the Cause : Incorrectly manufactured bolts that did not meet material specifications as noted on the Engineering drawing. Identification of Any Warning that can Occur : Noise coming from the area of the front axle may indicate the axle shifting and loose bolts. Involved Components : Part 573 Safety Recall Report 22V-009 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : U-Bolt Component Description : U-Bolt Component Part Number : A000A335 Supplier Identification : Component Manufacturer Name : Component Engineering Address : 1610 Independence Ave Hartford Wisconsin 53027 Country : United States Chronology : Not enough space to put all in here. See miscellaneous document Description of Remedy : Description of Remedy Program : Oshkosh will send new u-bolts that meet material specifications and that will secure the front axle properly. This will be done at no cost to the customer. How Remedy Component Differs from Recalled Component : The correct hardware will meet material properties as originally designed. Identify How/When Recall Condition was Corrected in Production : Production will be installing corrected U-bolts. This change was made in production on November 30th, 2021. A new Oshkosh PN was created to aid this cut-in. Recall Schedule : Description of Recall Schedule : Notifications to customers will be made via a customer letter. The 577 customer letter will be mailed pending NHTSA approval. Oshkosh does not distribute vehicles through dealers. Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : FEB 24, 2022 – MAR 24, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-009 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Oshkosh Corporation Submission Date : JAN 11, 2022 NHTSA Recall No. : 22V-009 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Oshkosh Corporation Address : 2307 Oregon Street PO Box 2566 Oshkosh WI 54903-2566 Company phone : 920-235-9151 Population : Number of potentially involved : 1,268 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2019-2022 Oshkosh S-Series Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : ALL Power Train : DIESEL Descriptive Information : Oshkosh determined through investigation that the bolts securing the front axle did not meet the required specifications as designed. Production Dates : SEP 13, 2018 – NOV 29, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Suspect bolts securing the front axle do not meet material properties as originally designed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Bolts that do not meet the material specifications and where the material is not sufficiently hard, have the potential to loosen or fail over time and may allow the front axle to shift or come loose and in an extreme case if the condition is not corrected, the front axle could detach from the vehicle. This could increase the risk of a crash. Description of the Cause : Incorrectly manufactured bolts that did not meet material specifications as noted on the Engineering drawing. Identification of Any Warning that can Occur : Noise coming from the area of the front axle may indicate the axle shifting and loose bolts. Involved Components : Part 573 Safety Recall Report 22V-009 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : U-Bolt Component Description : U-Bolt Component Part Number : A000A335 Supplier Identification : Component Manufacturer Name : Component Engineering Address : 1610 Independence Ave Hartford Wisconsin 53027 Country : United States Chronology : Not enough space to put all in here. See miscellaneous document Description of Remedy : Description of Remedy Program : Oshkosh will send new u-bolts that meet material specifications and that will secure the front axle properly. This will be done at no cost to the customer. How Remedy Component Differs from Recalled Component : The correct hardware will meet material properties as originally designed. Identify How/When Recall Condition was Corrected in Production : Production will be installing corrected U-bolts. This change was made in production on November 30th, 2021. A new Oshkosh PN was created to aid this cut-in. Recall Schedule : Description of Recall Schedule : Notifications to customers will be made via a customer letter. The 577 customer letter will be mailed pending NHTSA approval. Oshkosh does not distribute vehicles through dealers. Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : FEB 01, 2022 – MAR 04, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-009 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Oshkosh Corporation Submission Date : FEB 24, 2022 NHTSA Recall No. : 22V-009 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Oshkosh Corporation Address : 2307 Oregon Street PO Box 2566 Oshkosh WI 54903-2566 Company phone : 920-235-9151 Population : Number of potentially involved : 1,268 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2019-2022 Oshkosh S-Series Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : ALL Power Train : DIESEL Descriptive Information : Oshkosh determined through investigation that the bolts securing the front axle did not meet the required specifications as designed. Production Dates : SEP 13, 2018 – NOV 29, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Suspect bolts securing the front axle do not meet material properties as originally designed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Bolts that do not meet the material specifications and where the material is not sufficiently hard, have the potential to loosen or fail over time and may allow the front axle to shift or come loose and in an extreme case if the condition is not corrected, the front axle could detach from the vehicle. This could increase the risk of a crash. Description of the Cause : Incorrectly manufactured bolts that did not meet material specifications as noted on the Engineering drawing. Identification of Any Warning that can Occur : Noise coming from the area of the front axle may indicate the axle shifting and loose bolts. Involved Components : Part 573 Safety Recall Report 22V-009 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : U-Bolt Component Description : U-Bolt Component Part Number : A000A335 Supplier Identification : Component Manufacturer Name : Component Engineering Address : 1610 Independence Ave Hartford Wisconsin 53027 Country : United States Chronology : Not enough space to put all in here. See miscellaneous document Description of Remedy : Description of Remedy Program : Oshkosh will send new u-bolts that meet material specifications and that will secure the front axle properly. This will be done at no cost to the customer. How Remedy Component Differs from Recalled Component : The correct hardware will meet material properties as originally designed. Identify How/When Recall Condition was Corrected in Production : Production will be installing corrected U-bolts. This change was made in production on November 30th, 2021. A new Oshkosh PN was created to aid this cut-in. Recall Schedule : Description of Recall Schedule : Notifications to customers will be made via a customer letter. The 577 customer letter will be mailed pending NHTSA approval. Oshkosh does not distribute vehicles through dealers. Planned Dealer Notification Date : NR – NR Planned Owner Notification Date : FEB 24, 2022 – FEB 24, 2022 * NR – Not Reported

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