Excavator working in the quarry and junkyard, is very difficult to move the things in the truck, because the position of the cab is low, eyesight is not visible. The cab visibility, safety and ease of operation is obtained by the development of the cab lifting system moving the position. To apply cab lifting system on the existing excavator, development of new sub-frame is positively necessary. In this study, the sub-frame, which is suitable for its main function, is manufactured and is verified through hardness test, finite element analysis and endurance test.

Abstract
 1. 서론
 2. 연구방법
  2.1 재질 분석
  2.2 제품의 기본설계
 3. 결과 및 고찰
  3.1 Cab 리프팅 시스템 구조해석
  3.2 Cab 리프팅 시스템 최종도면
  3.3 Cab 리프팅 시스템 제작
  3.4 Cab 리프팅 시스템 내구시험
 4. 결론

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