The traveling deviation of the excavator means that the flow on both sides of the traveling pump is different. The analysis idea is as follows: the mainstream quantity of P 1 P2 hydraulic pump is inconsistent, the walking flow on the left and right sides of the distributor is inconsistent, the linear walking valve is faulty, the low-pressure secondary pilot pressure on the left and right sides is inconsistent, the displacement of the walking motor is inconsistent, the crawler part is mechanically faulty, and the loop is faulty. One is to distinguish between mechanical faults and circuit faults, such as P 1P2 hydraulic pump proportional valve, hydraulic pump servo mechanism, distributor, linear proportional valve, walking motor variable pump mechanism, etc.