The defect
PACCAR IS RECALLING CERTAIN MODEL YEAR 2011-2012 KENWORTH T270/370, T440/T470, T800, T660, W900 AND C500 VEHICLES MANUFACTURED BETWEEN OCTOBER 18, 2010, AND JANUARY 28, 2011. CERTAIN CAST IRON SLACK ADJUSTER HOUSINGS, WHICH TRANSMIT BRAKING FORCE FROM THE BRAKE CHAMBER PUSH ROD TO THE BRAKE CAM TUBE, MAY INCLUDE A FLOW NOTCH IN THE HANDLE PORTION OF THE HOUSING DUE TO AN ERROR DURING THE CASTING PROCESS. A FLOW NOTCH IN THE HANDLE PORTION MAY REDUCE THE EFFECTIVE CROSS SECTION STRUCTURE AND CAUSE THE SLACK ADJUSTER HOUSING TO FRACTURE.
The risk
IF THE SLACK ADJUSTER HOUSING WERE TO FRACTURE, THE WHEEL BRAKE TO WHICH THE SLACK ADJUSTER HOUSING IS ATTACHED WOULD NO LONGER FUNCTION, WHICH COULD INCREASE VEHICLE STOPPING DISTANCES, AND IF MOUNTED ON THE STEER AXLE, COULD CAUSE THE VEHICLE TO PULL TO ONE SIDE DURING BRAKING, INCREASING THE RISK OF A CRASH.
The remedy
DEALERS WILL INSPECT AND REPLACE THE SLACK ADJUSTER HOUSING AS NECESSARY. THIS SERVICE WILL BE PERFORMED FREE OF CHARGE. THE SAFETY RECALL BEGAN ON MARCH 30, 2011. OWNERS MAY CONTACT KENWORTH AT 425-828-5440.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Kenworth C500 | 2011, 2012 |
| Kenworth T170 | 2012 |
| Kenworth T270 | 2011 |
| Kenworth T370 | 2011, 2012 |
| Kenworth T440 | 2011, 2012 |
| Kenworth T470 | 2011, 2012 |
| Kenworth T660 | 2011, 2012 |
| Kenworth T800 | 2011, 2012 |
| Kenworth W900 | 2011, 2012 |
Components: SERVICE BRAKES, AIR:SLACK ADJUSTERS
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Kenworth C500 | 2011 | 0 | 6 |
| Kenworth C500 | 2012 | 1 | 3 |
| Kenworth T170 | 2012 | 0 | 3 |
| Kenworth T270 | 2011 | 0 | 4 |
| Kenworth T370 | 2011 | 0 | 5 |
| Kenworth T370 | 2012 | 0 | 6 |
| Kenworth T440 | 2011 | 0 | 7 |
| Kenworth T440 | 2012 | 0 | 9 |
| Kenworth T470 | 2011 | 0 | 5 |
| Kenworth T470 | 2012 | 0 | 5 |
| Kenworth T660 | 2011 | 1 | 13 |
| Kenworth T660 | 2012 | 1 | 9 |
| Kenworth T800 | 2011 | 1 | 13 |
| Kenworth T800 | 2012 | 1 | 10 |
| Kenworth W900 | 2011 | 0 | 10 |
| Kenworth W900 | 2012 | 0 | 8 |
Other service brakes, air recalls in 2011
28 of the 597 recall campaigns reported to NHTSA in 2011 concerned the service brakes, air; PACCAR INCORPORATED filed 113 campaigns in all.
| 11V601000 28 Dec 2011 | ROSA TRAILER MFG |
| 11V587000 6 Dec 2011 | SPARTAN CHASSIS, INC. |
| 11V555000 10 Nov 2011 | MERTZ MANUFACTURING, LLC |
| 11V512000 13 Oct 2011 | GREAT LAKES MANUFACTURING INC. |
| 11V488000 3 Oct 2011 | TRANSCRAFT CORPORATION |
| 11V481000 22 Sept 2011 | WILSON TRAILER COMPANY |
| 11V479000 16 Sept 2011 | SILVER EAGLE MANUFACTURING |
| 11V412000 11 Aug 2011 | Spartan Motors, Inc. |
NHTSA recalls (public domain) · all recalls of 2011