NIOSHTIC-2 Publications Search

Evaluation of the NAGCAT tractor guidelines.

Fathallah FA; Chang JH; Meyers JM; Miles JA; Miller BL; Marlenga B; Berg RL; Pickett W
2007 ASABE Annual International Meeting, June 17-20, 2007, Minneapolis, Minnesota. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2007 Jun; :075008
This study aims to build upon the North American Guidelines for Children's Agricultural Tasks (NAGCAT) project by providing a field test of the NAGCAT tractor guidelines. Several tractor dealers and farmers offered their tractors for the study in California and Wisconsin; for a total of 86 tractors. A unique photographic technique provided 3-D digital mock-ups of the tractors, which facilitated the evaluation of reach and visual abilities of adolescents using anthropometric data. Force requirements were captured using a digital force gauge and compared to existing force requirements and databases. The results indicate, in general, that hand-operated controls tend to be out of reach for both genders with the exception of steering wheels. The worst controls were hand throttle levers. On the other hand, foot-operated controls yielded higher reachable percentages for both genders, while steering wheels showed a medium range of reachable percentages. In general, youth operators showed relatively restricted fields of vision compared to the adults, and their fields of vision decreased as obstacles were closer to the tractor. The results also showed that foot-operated controls require more strength than the recommended levels. In the meantime, the recommended physical strengths of children surpassed the activation forces for hand-operated controls. This result suggests that youth operators would be very likely exposed to muscle fatigue in the leg due to the frequent use of foot clutches and brakes during tractor operation. The study showed that the demarcation of the NAGCAT by the size of the tractor is not significant for the majority of controls.
Agricultural-industry; Agricultural-machinery; Agricultural-workers; Children; Equipment-operators; Ergonomics; Machine-operators; Physiological-measurements; Posture; Quantitative-analysis; Risk-analysis; Tractors; Work-analysis; Author Keywords: ergonomics; safety; adolescents; children
Publication Date
Document Type
Conference/Symposia Proceedings
Funding Type
Fiscal Year
Identifying No.
Source Name
2007 ASABE Annual International Meeting, June 17-20, 2007, Minneapolis, Minnesota
Performing Organization
University of California, Davis
Page last reviewed: March 18, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division