The utility model provides a crawler tractor turns to with combination hydro-cylinder, includes: connect nut, piston, hydro-cylinder casing, dust ring I, wear ring I, end cover, check lay circle I, wear ring II, this special sealing, dust ring II, stopper piston, apron, O shape circle I, check lay circle II, return spring, sequence valve, piston and stopper piston are arranged respectively to the both sides of hydro-cylinder casing, and the one end of piston is spacing with the apron, and the other end is equipped with and connects and the nut, the stopper piston is hollow structure, its for the tip end cover spacing dust ring I, wear ring I be equipped with on the end cover outside from in to, ge lai circle I dress is on the stopper piston, wear ring II, this special sealing, dust ring II is arranged on the hydro-cylinder casing outside to by interior to the suit is on the stopper piston, O shape circle I is equipped with on the apron, ge lai circle II lies in the piston, the return spring suit is on the piston to the dress is inside left hydro-cylinder casing, and sequence valve A sets up in the hydro-cylinder casing