MAIN ENGINE HYD TOP BRACING AIR OIL CUSHION MODEL: AOC-300 SER.NO.: GCAOC 301346 MAKER: GC Technology Co.,Ltd Manual,page-17 Top-bracing part list DWG No:GC-981116 CYLINDER ASSEMBLY; DWG.: GC-981116. Part No.2 GC Technology.AOC-300.2