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AirLiner™ Suspension Air-Spring Bag Misalignment Troubleshooting

1. 04 06 2010 A Air Spring Bag Angle 321153 Fig 2 Checking the Air Spring Bag Angle Perform a ride height check following the instructions in the section titled Freightliner Airliner Rear Suspen sion in Group 32 of the applicable workshop service manual Check the AirLiner leaf spring bushing pins for wear or walk out off center placement The centerlines of the holes in the pins should be 1 1 3 inch 34 mm from each outside edge of the leaf spring See Fig 3 Correct as necessary following the instructions in the section titled Freightliner Airliner Rear Suspension in Group 32 of the applicable workshop service manual Check that the axle seats are installed correctly See Fig 4 An axle seat installed backwards can cause a pronounced right to left air spring bag height difference Use PartsPro module 431 EZWiring to see the engineering installation drawing of the axle seat If an axle seat is found to be installed backwards remove it then install it correctly following the instructions in the section titled Freightliner Airliner Rear Suspension in Group 32 of the applicable workshop service manual Check the rear axle s tracking See Fig 5 6 1 Measure from the inner side of the rear tire to the outer side of the frame rail at the right side of the forward rear drive axle 6 2 Measure the same distance at both sides of the rearmost drive axle Page 2 Freightliner Ser
2. A16 13999 XXX 3 5 8 to 4 95 to 101 Target 3 7 8 98 4 to 4 1 4 102 to 108 Target 4 1 8 105 Table 2 Leaf Spring Rear End Camber Specifications Freightliner Service Bulletin September 2010 Page 9 AirLiner Suspension Air Spring Bag Misalignment 32 40 Troubleshooting i i FLA COE gt FLC 112 Conventional gt Columbia Freightliner E FLB COE gt Century Class Conventional gt Coronado Service Bulletin gt FLD Conventional gt Argosy COE gt Business Class M2 gt Business Class gt Cargo gt Cascadia A B T A NS O rd A 7 D O I l 7 C 10 30 2001 320922 A Single Leaf Spring C Dual Leaf Spring D Measure camber here B Measure camber here Fig 12 AirLiner Leaf Spring Rear End Camber Measurements 5 Ifa leaf spring is out of tolerance remove it from the vehicle and repeat the rear end camber measurement with the leaf spring lying on a flat surface 6 If the leaf spring is still out of tolerance replace it following the instructions in the section titled Freightliner Airliner Rear Suspension in Group 32 of the applicable workshop service manual Warranty General Troubleshooting Procedure This is an informational procedure only warranty does not apply for this procedure Checking Air Spring Bag Misalignment Causes Normal warranty applies however you must obtain approval from your District Service Manager before making any repairs When submitting
3. Description hours f Kick Twist Angle Check Mounting Hole Location Check and Rear End 622 000550647 622 5005 Camber Check 2 Leaf Springs R R 3 8 Table 3 QuickClaim Damage Code and Labor Allowance OWL VMRS Codes and Labor Allowance Component Code Cause Code SRT Code Description Time Hours 016 002 001 22 622 5005B_ Kick Twist Angle Check and 1 Leaf Spring R R 2 0 016 002 001 22 622 5005C Kick Twist Angle Check and 2 Leaf Springs R R 3 4 016 002 001 22 622 5005E Kick Twist Angle Check and Mounting Hole 2 3 Location Check 1 Leaf Spring R R 016 002 001 22 622 5005F Kick Twist Angle Check and Mounting Hole 3 6 Location Check 2 Leaf Springs R R 016 002 001 22 622 5005H Kick Twist Angle Check Mounting Hole 2 5 Location Check and Rear End Camber Check 1 Leaf Spring R R 016 002 001 22 622 5005 Kick Twist Angle Check Mounting Hole 3 8 Location Check and Rear End Camber Check 2 Leaf Springs R R Table 4 OWL VMRS Codes and Labor Allowance Freightliner Service Bulletin September 2010 Page 11
4. AirLiner Suspension Air Spring Bag Misalignment Troubleshooting 32 40 FLA COE gt FLC 112 Conventional gt Columbia i j FLB COE gt Century Class Conventional gt Coronado Freightliner gt FLD Conventional gt Argosy COE gt Business Class M2 Service Bulletin gt Business Class gt Cargo gt Cascadia Description of Revisions This bulletin replaces the version dated May 2010 The part numbers in Table 2 have been revised General Information NOTE This service bulletin does not apply to 23 000 46 000 lb capacity Airliner rear suspensions On vehicles equipped with 20 000 40 000 lb tandem axles this service bulletin applies to both rear axle suspensions IMPORTANT A leaning or tilted air spring bag does not affect the operation of the Freightliner Air Liner rear Suspension This is an aesthetic issue only Freightliner AirLiner rear suspensions with 10 000 12 000 15 000 18 000 lb and 20 000 40 000 Ilb capacities are equipped with air springs that are supported at the bottom by single or dual leaf springs These leaf springs with a 30 degree bend as viewed from above at the rear are used in place of the crossbar used on the 23 000 46 000 lb capacity suspensions The most common air spring bag alignment complaints are a leaning or tilted air spring bag or different air spring bag heights between left and right sides See Fig 1 The critical leaf spring dimensions that directly affect these complaints are e kick twis
5. claims reference this service bulletin by number in the story of the claim and include the part number of any component replaced Use the damage code and time guide information in Table 3 and Table 4 IMPORTANT Warranty claims for this bulletin require a pre authorized warranty Field Service Authori zation FSA QuickClaim Damage Code and Labor Allowance Par Time Damage Code SRT Code Description hours 622 000550647 622 5005B Kick Twist Angle Check and 1 Leaf Spring R R 2 0 622 000550647 622 5005C _ Kick Twist Angle Check and 2 Leaf Springs R R 3 4 622 000550647 622 5005E Kick Twist Angle Check and Mounting Hole Location Check 1 Leaf Spring R R 2 3 622 000550647 622 5005F E Angle Check and Mounting Hole Location Check 2 Leaf Springs 36 622 000550647 622 5005H Kick Twist Angle Check Mounting Hole Location Check and Rear End 25 Camber Check 1 Leaf Spring R R Page 10 Freightliner Service Bulletin September 2010 AirLiner Suspension Air Spring Bag Misalignment Troubleshooting FLA COE FLB COE gt FLD Conventional gt Business Class gt FLC 112 Conventional gt Century Class Conventional gt Coronado gt Argosy COE gt Cargo gt Columbia gt Business Class M2 gt Cascadia 32 40 Freightliner Service Bulletin QuickClaim Damage Code and Labor Allowance aed Time Damage Code SRT Code
6. ing If the axle clamps are not correctly aligned raise the vehicle and support the frame rails with safety stands With the axle supported loosen the U bolts then install the axle clamps correctly Freightliner Service Bulletin September 2010 Page 3 AirLiner Suspension Air Spring Bag Misalignment 32 40 Troubleshooting i i FLA COE gt FLC 112 Conventional gt Columbia Freightliner E FLB COE gt Century Class Conventional gt Coronado Service Bulletin gt FLD Conventional gt Argosy COE gt Business Class M2 gt Business Class gt Cargo gt Cascadia 2 1 JA N DN 3 3 10 10 2001 5 4 320937 1 Axle Housing bottom surface 2 Axle Seat 3 U Bolt 4 Lower U Bolt Retainer axle clamp 5 Leaf Spring Fig 4 Axle Seat Installation A B T T A A T A Cc t 07 25 2001 320918 Fig 5 Axle Tracking Measurements 8 Check the axle U bolts and tighten them to the torque value in Table 1 Page 4 Freightliner Service Bulletin September 2010 AirLiner Suspension Air Spring Bag Misalignment Troubleshooting 32 40 FLA COE gt FLC 112 Conventional gt Columbia i j FLB COE gt Century Class Conventional gt Coronado Freightliner gt FLD Conventional gt Argosy COE gt Business Class M2 Service Bulletin gt Business Class gt Cargo gt Cascadia Hn A Q lt 07 25 2001 A 320917 A Measurement 4 7 8 to 5 1 4 124 to 133 mm 1 Leaf Spring Fig 6 Axle Cla
7. lowing procedure to check if the rear end camber of the leaf springs is within specification 1 Measure the distance from the bottom of each leaf spring to the ground Measure at the air spring mounting hole See Fig 11 Repeat each measurement three times to ensure accuracy If the difference between the two leaf spring measurements is less than 3 8 inch 9 5 mm no further modi fication is necessary Freightliner Service Bulletin September 2010 Page 7 AirLiner Suspension Air Spring Bag Misalignment 32 40 Troubleshooting i i FLA COE gt FLC 112 Conventional gt Columbia Freightliner E FLB COE gt Century Class Conventional gt Coronado Service Bulletin gt FLD Conventional gt Argosy COE gt Business Class M2 gt Business Class gt Cargo gt Cascadia A ml A B 1 C 1 2 3 D 07 26 2001 320923 A 16 inches 406 mm C Location Measurement Tool side D Location Measurement Tool top B 4 inches 100 mm minimum view view 1 Bolt No 1 2 Location Measurement Tool 3 Bolt No 2 Fig 9 Air Spring Mounting Hole Location Measurement Tool 16 inch 406 mm 12 05 2007 321106 A Bottom View B 16 Inches 406 mm Between Bolt Centers 1 Air Spring Piston 3 Air Spring Mounting Bolt and Nut 5 Lower U Bolt Retainer 2 Leaf Spring 4 Measure Tool Fig 10 Measuring the Air Spring Mounting Hole Location Page 8 Freightliner Service Bulletin Sep
8. mp Axle Alignment Measurement U Bolt Torque Specifications U Bolt Size ABLE IN a 5 8 18 UNF 180 to 230 244 to 311 3 4 16 UNF 270 to 330 366 to 447 7 8 14 UNF 420 to 500 569 to 678 1 14 UNF 520 to 600 705 to 813 Table 1 U Bolt Torque Specifications 9 Confirm that the leveling valve s is are plumbed correctly Use PartsPro module 910 EZWiring to view the plumbing schematic 10 If the air spring bag still appears to be out of alignment after completing the steps in General Troubleshoot ing determine the nature of the misalignment See Fig 7 Checking the Leaf Spring Kick Twist Angle The leaf spring kick angle is designed to be slightly upward when the spring is unladen then settle level when the spring is laden The plane of the leaf spring kick should be 0 0 degrees to 4 0 degrees from the horizontal with the spring un laden or 2 0 degrees from the horizontal when fully laden Do the following procedure to determine if the kick twist angle is within specification 1 From the rear of the vehicle measure the distance from each end of the air spring piston to the ground See Fig 8 Repeat each measurement three times to ensure accuracy 2 If the difference between the two measurements in the previous step is less than 3 8 inch 9 5 mm no fur ther modification is necessary If the difference between these two measurements is more than 3 8 inch 9 5 mm the leaf spring i
9. oubleshooting 32 40 FLA COE gt FLC 112 Conventional gt Columbia i j FLB COE gt Century Class Conventional gt Coronado Freightliner gt FLD Conventional gt Argosy COE gt Business Class M2 Service Bulletin gt Business Class gt Cargo gt Cascadia C ZN T A B 07 26 2001 T 320920 A Measure here B Measure here C 3 8 9 5 mm Maximum Laden or Unladen Fig 8 AirLiner Leaf Spring Kick Twist Angle Measurement Measure the distance between the center of the bolts to ensure that they are exactly 16 inches 406 mm Correct as necessary until this distance is accurate See Fig 9 From under the vehicle align the center of one of the bolts on the measurement tool with the center bolt in the lower U bolt retainer See Fig 10 Pivot the measurement tool around to align the second bolt on the measurement tool with the air spring mounting bolt and nut Make sure the first bolt is still aligned with the center bolt in the lower U bolt retainer See Fig 10 If the second bolt aligns with the air spring mounting bolt and nut the leaf spring is within this tolerance No further modification is necessary If the second bolt does not align with the air spring mounting bolt and nut the leaf spring is out of tolerance Replace it following the instructions in the section titled Freightliner Airliner Rear Suspension in Group 32 of the applicable workshop service manual Checking the Rear End Camber Do the fol
10. s out of tolerance Replace it following the instructions in the section titled Freightliner Airliner Rear Suspension in Group 32 of the applicable workshop service manual Freightliner Service Bulletin September 2010 Page 5 AirLiner Suspension Air Spring Bag Misalignment 32 40 Troubleshooting i i FLA COE gt FLC 112 Conventional gt Columbia Freightliner E FLB COE gt Century Class Conventional gt Coronado Service Bulletin gt FLD Conventional gt Argosy COE gt Business Class M2 gt Business Class gt Cargo gt Cascadia A B 07 26 2001 4 320919 A Kick twist angle leaf spring plane not horizontal causing a tilt B Air spring mounting hole location incorrect causing air spring bag skew C Rear end camber incorrect causing right to left air spring bag height difference Fig 7 Most Common Airbag Misalignment Complaints Checking the Air Spring Mounting Hole Location Do the following procedure to determine if the air spring mounting holes are located correctly on the leaf spring 1 Drill two holes exactly 16 inches 406 mm apart on a piece of wood or metal at least 18 inches 450 mm long 2 Install a bolt into each hole and secure with a nut and washers if needed Select a bolt size that will pro trude from the edge of the wood or metal by at least 4 inches 100 mm Page 6 Freightliner Service Bulletin September 2010 AirLiner Suspension Air Spring Bag Misalignment Tr
11. t angle e air spring mounting hole location e rear end camber 04 30 2010 f321157 Fig 1 Rear of Vehicle with Misaligned Air Bags General Troubleshooting Procedure If a vehicle air spring bag is misaligned perform the following general checks before proceeding to the more specific checks 1 Park the vehicle on a level surface shut down the engine and set the parking brake Chock the tires IMPORTANT Repeat the air spring angle check after each adjustment procedure 2 Using a digital level tool check the angle of the air spring bag relative to the frame rail 2 1 Fully inflate the rear suspension then place a digital level tool vertically against the outside of the frame rail web and set it to zero Freightliner Service Bulletin September 2010 Page 1 AirLiner Suspension Air Spring Bag Misalignment 32 40 Troubleshooting i i FLA COE gt FLC 112 Conventional gt Columbia Freightliner E FLB COE gt Century Class Conventional gt Coronado Service Bulletin gt FLD Conventional gt Argosy COE gt Business Class M2 gt Business Class gt Cargo gt Cascadia 2 2 Place the level tool vertically against the outside of the air spring bag as shown in Fig 2 If the angle is less than 6 0 degrees the air spring bag angle is within specifications and no further action is required If the angle is more than 6 0 degrees from vertical proceed to the next step e A
12. tember 2010 AirLiner Suspension Air Spring Bag Misalignment 32 40 Troubleshooting FLA COE gt FLC 112 Conventional gt Columbia i j FLB COE gt Century Class Conventional gt Coronado Freightliner gt FLD Conventional gt Argosy COE gt Business Class M2 Service Bulletin gt Business Class gt Cargo gt Cascadia A A A l T 07 26 2001 A 3 8 9 5 mm Maximum Laden or Unladen 320921 Fig 11 AirLiner Leaf Spring Rear End Camber Measurement If the difference between the two measurements is more than 3 8 inch 9 5 mm one or both of the leaf springs is out of tolerance Go to the next step 3 With the leaf springs installed on the vehicle using a straight edge measure the rear end camber at the air spring mounting hole on the leaf spring See Fig 12 Repeat each measurement three times to ensure accuracy 4 Compare the measured values to the camber specification shown in Table 2 Leaf Spring Rear End Camber Specifications Leaf Spring Capacity Type Part Number Camber Specifications Laden inches mm Camber Specifications Unladen inches mm 10 12 or 15 000 Ib Single Leaf 16 15468 XXX 2 1 8 to 2 3 8 54 to 60 Target 2 1 4 57 2 1 4 to 2 1 2 57 to 63 Target 2 3 8 60 20 or 40 000 Ib Single Leaf 16 14862 XXX 2 5 8 to 3 70 to 76 Target 2 7 8 73 2 7 8 to 3 1 8 73 to 79 Target 3 76 20 or 40 000 b Dual Leaf
13. vice Bulletin September 2010 AirLiner Suspension Air Spring Bag Misalignment Troubleshooting FLA COE gt FLC 112 Conventional FLB COE gt Century Class Conventional gt FLD Conventional gt Business Class gt Argosy COE gt Cargo gt Columbia gt Coronado gt Business Class M2 gt Cascadia 32 40 Freightliner Service Bulletin Ga 05 07 2010 1 1 3 inch 34 mm Top View Inboard Air Spring Mounting Hole Location Lengthways Air Spring Mounting Hole Location Leaf Spring Bushing Pin 00w E Kick Twist Angle F Rear End Camber G Side View Fig 3 AirLiner Leaf Spring Critical Dimensions f320916 Dimensions B and C must not vary from dimension A by more than 1 4 inch 6 mm 6 3 If dimensions B and C vary from dimension A by more than 1 4 inch 6 mm loosen the lateral torque rods at the frame rail and add or subtract shims as necessary following the instructions in the section titled Freightliner Airliner Rear Suspension in Group 32 of the applicable workshop service manual 7 Check that the axle clamps are correctly aligned on the axle housing and not shifted inboard or outboard See Fig 6 The distance from the brake spider flange to the outside surface of the leaf spring should be 4 7 8 to 5 1 4 inches 124 to 133 mm The upper axle clamps should align with the dowels on the top sur face of the axle hous

AirLiner™ Suspension Air-Spring Bag Misalignment Troubleshooting

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