... YOTFJ450/560/650/750/875 speed-adjustable hydraulic coupling reverse-gear reducerProduct usage: used together with 140, 190, 260, ... Parameters of YOTFJ560~875 series speed-adjustable coupling reverse-gear box power unitsSequence numberCoupling modelDiesel engine modelMud pump modelSet ... , 650, 750, 830, 900 mm, which can match with internal combustion engines (diesel engine, gas engine) of 135, 140, ...