Gear pumps used for some time, its performance will decline, the survey showed that the main form of Hanzhong roller hydraulic maintenance, gear pump is damaged bushings, wear a uniform and gear pump housing and scratches, even wear amount is generally 0.02 to 0.50 between mm, scratch depth is generally between 0.05-0.50mm. Due to restrictions by the farming season, after damage in urgent need of repair in a short time, but we must also consider the second life after the repair of the gear pump and maintenance costs and maintenance work on-site operability. This article describes the quick fix methods arc spraying and smearing techniques. In recent years, roller hydraulic repair company, the domestic construction machinery market booming, hydraulic technology is a key technology to modernize mechanical transmission and control, the domestic high-grade, high-quality development of construction machinery but by localization of hydraulic parts no control core high-end engineering machinery and large equipment hydraulic core technology to foreign monopoly. At present, the domestic production of hydraulic parts focused on 16MPA following gear pumps, tanks, valves and other main dosing systems can only be used on loaders, forklifts, bulldozers and other products.