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|  MIL-T-62531(AT)
APPENDIX A
3.7.6 Cramping angle. Front wheel cramping angle shall be not less than ______ degrees,
measured at the wheel on the inside of the turning circle. Angle stops shall be provided, and
adjusted (within a tolerance of plus ______ degree, minus ______ degree) to provide the
maximum safe cramping angle. When adjusted, axle stops shall be so set that the angle
adjustment cannot be readily altered and shall positively limit the cramping angle to the
maximum angle of the stop adjustment.
Rationale
The front wheel cramping angle shall provide the smallest diameter turning circle without
damaging the steering linkage or geometry as is possible, and without the inside face of tires
rubbing on any part of the underbody structure.
Guidance
Insert the turning angle in degrees including the required tolerance. The steering linkage and
gearbox shall be protected from excessive force by providing heavy duty stops that prevent the
wheels from turning too far. The stops shall also be positioned such that the tires will not contact
the vehicle frame.
Lessons Learned
4.7.6 Cramping angle test. To determine conformance to 3.7.6, the front wheels shall be
turned to maximum right and left positions and, to assure that the ______ degree turning angle is
met, there shall be no clearance between the faces of the axle stops. Faces of stops must contact
each other simultaneously.
Verification Rationale
The wheels when turned right and left from stop to stop shall turn freely and smoothly
without interference. When the axle stops make contact, verify and assure that the tires do not
contact the body or chassis. Body or chassis contact shall be avoided to prevent excessive
stresses on the steering linkages and tire wear.
Verification Guidance
Insert the required turning angle in blank space. To facilitate wheel turning operations,
position the vehicle on a smooth, level surface, inflate the tires to the recommended operating
pressure, and verify that the payload is properly positioned.
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