SAE J321-1999 (R)Tire Guards for Operator Protection-Earthmoving Haulage Machines

1. Scope-This SAE Standard establishes a criteria for a minimum zone of protection for the operator of themachine and establishes certain structural requirements for guards on pneumatic-tired earthmoving haulage machines capable of speeds in excess of 25 km/h. Earthmoving machines covered by this document are dumpers and tractor-scrapers as identified in SAE J/ISO 6165.

2. References
2.1 Applicable Publications-The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated, the latest revision of SAE publications shall apply.
2.1.1 SAE PUBLICATIONS-Available from SAE,400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J397 OCT95Deflection Limiting Volume-Protective Structures Laboratory Evaluation
SAE J/ISO 6165-Earthmoving Machinery-Basic Types-Vocabulary

3. Definitions
3.1 Zone of Protection-The area which shall be protected from material thrown tangentially from a rotating tire of the machine, in a plane parallel to the rotation of the tire for all oscillation and steering angles in a hauling position.

4. General Requirements
4.1 Zones of Protection
4.1.1 FORWARD ZONE OF PROTECTION-When the operator position is located forward of the tire centerline. This area is defined by a line intersecting the forward extremity of the Deflection Limiting Volume (DLV), as defined in SAE J397, and by a vertical tangent to the rear edge of the tire as shown in Figure 1A.
4.1.2 REARWARD ZONE OF PROTECTION-When the operator position is located rearward of the tire centerline. This area is defined by lines drawn tangent to the tire and intersecting the extremities of the DLV. The rear zone line shall form an inclusive angle to the ground line of not greater than 90 degrees as shown in Figure 1B.
4.1.3 The width of the Zone of Protection shall be as shown in Figure 2.

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