521 / 1WS
Serial: 1 → 99999
105 system groups
▶AIR INLET AND EXHAUST 4
▶BASIC ENGINE 15
▶ELECTRICAL AND STARTING 10
▶ENGINE ARRANGEMENT 1
▶FRAME AND BODY 8
▶FUEL 6
▶HYDRAULIC 15
▶MACHINE ARRANGEMENT 1
▶OPERATOR STATION 18
▶SERVICE EQUIPMENT AND SUPPLIES 3