1131003131 Genuine Oil Pump for Isuzu 4HK1 Engine Hitachi Excavator Parts

The oil pump with part number 1131003131 is an original core lubrication component designed specifically for the Isuzu 4HK1 series diesel engines. It is mainly suitable for multiple Hitachi medium-sized hydraulic excavators equipped with this engine, including common models such as ZX200-3, ZX240-3, EX200-3, etc. This part number belongs to a series, and its common or associated part numbers may include 1-13100313-1, 1-13100313-3, 1-13100313-6, etc., depending on the production batch and host factory adaptation requirements.

The oil pump is the "heart" of the engine lubrication system, responsible for pumping oil out of the oil pan at a stable pressure and flow rate, and delivering it through filters and oil passages to all key friction surfaces such as the crankshaft, camshaft, piston, and valves, forming an effective lubricating oil film to reduce wear, dissipate heat, and clean the interior. As an original component, it is made of high-strength alloy steel or cast iron, and the gears or rotors are precision machined and heat-treated to ensure dimensional stability and wear resistance under harsh working conditions of high engine speed and high temperature (oil temperature can reach 120 ℃ or above). It is equipped with a pressure limiting valve inside, which automatically opens to release pressure when the system pressure is too high, to protect the oil pump itself and the entire lubrication system.

The core of oil pump maintenance is to ensure that the lubrication system is exceptionally clean, regularly monitored, and operated in a standardized manner. Daily maintenance: It is necessary to use engine oil that meets the specifications and strictly replace the oil and oil filter according to the maintenance cycle (usually every 500 working hours) to prevent metal debris and sludge from blocking the oil pump suction filter or wearing out internal parts. When replacing the oil pump, be sure to first drain the old oil and thoroughly clean the oil pan and suction pipe. Before installing a new pump, apply an appropriate amount of engine oil to the sealing ring and tighten the fixing bolts according to the standard torque and sequence.