(1) Complete all the contents of 400h technical maintenance.
(2) Replace the transmission hydraulic oil for the hydraulic steering system.
(3) Replace the transmission hydraulic oil for the transmission system and the lifter.
(4) Check the valve clearance of the diesel engine.
(5) Check and adjust the fuel injection pressure of the fuel injection pump.
(6) Clean and maintain the fuel tank.
(7) Maintain the diesel engine in accordance with the requirements of "Tier-level Technical Maintenance" in the "Diesel Engine Operation and Maintenance Manual".