GF1800E-R-2 HYDRAULIC SYSTEM Parts group GF1800E-R-2 J20100 HYDRAULIC PIPE (SUCTION) J20200 HYDRAULIC OIL LINE (HST) J20300 HYDRAULIC OIL LINE (PTO) J40500 CONTROL VALVE J41000 CONTROL VALVE (COMPONENT PARTS) sale parts diagram catalog online construction equipment excavator tractor