굴삭기구조 7 [포크레인 구조] - 트랙, 상부롤러, 하부롤러 1. 트랙 2 SHOE 3 SHOE 4 SHOE 5 SHOE, FLAT 6 SHOE 7 SHOE 8 BOLT, SHOE 9 NUT,SHOE 10 BOLT, SHOE 11 TRACK LINK ASSY 11-1 TRACK LINK. R.H. 11-2 TRACK LINK L.H. 11-4 PIN,TRACK 11-5 BUSHING, MASTER 11-6 PIN,MASTER 11-7 SEAL,DUST 11-8 COLLAR 11-9 BUSHING 2. 상부롤러 1 ROLLER 2 SHAFT ASSY 3 PLATE 4 COVER 5 BUSHING 6 SEAL,FLOATING 7 O-RING 8 CAPSCREW 9 SNAP RING 10 PLUG 3. 하부..