L3600DT-GST-C TRANSMISSION Parts group L3600DT-GST-C T06500 TRANSMISSION CASE T06600 MAIN SHAFT T06700 COUNTERSHAFT T06800 HYDRAULIC CLUTCH T06902 SHUTTLE SHAFT T07002 RANGE GEAR SHAFT T07100 PTO COUNTERSHAFT T07200 PTO CLUTCH T07301 PTO SHAFT T07400 MID PTO sale parts diagram catalog online construction equipment excavator tractor