A DEFECT IN THE FRONT LOCK PORTION OF THE FIFTH WHEEL CASTING (A STRUCTURAL, LOAD BEARING COMPONENT OF THE FIFTH WHEEL ASSEMBLY) CAUSES A CRACK IN THE CASTING. THIS CRACK CAN PROPAGATE OVER TIME.
A DEFECT IN THE FRONT LOCK PORTION OF THE FIFTH WHEEL CASTING (A STRUCTURAL, LOAD BEARING COMPONENT OF THE FIFTH WHEEL ASSEMBLY) CAUSES A CRACK IN THE CASTING. THIS CRACK CAN PROPAGATE OVER TIME.
IMPROPER MATERIAL IN THE ELEVATING NUT OF THE LANDING GEAR COULD REDUCE THE LOAD BEARING CAPACITY OF THE ASSEMBLY.
PINTLE BODY CHEMISTRY AND HEAT TREAT PROBLEM WHICH RESULTS IN DECREASED PINTLE HORN STRENGTH.
INADEQUATE SUPPORT OF THE BALL HITCH AT ITS ATTACHMENT ONTO THE MOUNTING.
THE DEFECT IS A HOUSING FIT UP PROBLEM WHICH RESULTS IN IMPROPER CLAMPING AND UNEVEN LOAD DISTRIBUTION IN THE HOUSING OF THE PINTLE HOOK ASSEMBLY. CONSEQUENCE OF DEFECT: SHOULD THE DEFECT GO UNDETECTED AND UNREPAIRED, SEPARATION OF THE TRACTOR AND TRAILER IS A POSSIBILITY.
ON THE INVOLVED VEHICLES, THERE IS A POSSIBILITY OF A FATIGUE CRACK STARTING AT THE PLUNGER WINDOW OF THE OUTBOARD SUPPORT LEG OF THE BRACKET SUB ASSEMBLIES.