This OTTO excavator computer board (8-97506206-0 / 8-97525756-1) is manufactured to standard OEM quality specifications, serving as the core ECM controller for Isuzu 4HK1 and 6HK1 diesel engines. It features precise program calibration and accurate signal sensing, intelligently regulating fuel injection, engine speed and operating parameters to ensure stable engine operation, sufficient power output and optimized fuel efficiency during various construction scenarios.

This OTTO common rail fuel injector assembly with part number 8-98238463-2 / 8982384632 is a precision fuel injection component specially designed for Isuzu 4HK1 and 6HK1 engines. It delivers accurate, uniform and atomized fuel injection under high common rail pressure, effectively improving engine combustion efficiency, boosting machine power output and reducing black smoke emission during excavator operation.

This OTTO original EGR Valve with part numbers 8-98001191-0 and 8-98179546-0 is professionally manufactured for Isuzu 4HK1 engine assemblies. As a core exhaust gas recirculation component for ZX200-3 excavators, it precisely controls exhaust gas circulation volume, effectively lowering engine combustion temperature, reducing nitrogen oxide emissions, and optimizing engine combustion efficiency to meet standard construction machinery emission requirements.

This OTTO intake pressure sensor (Part‑No: 8‑98121697‑0 / 8981216970 / 60311894), also known as MAP sensor, delivers highly‑accurate real‑time intake pressure feedback for engine control units. Stable signal output effectively avoids wrong fuel injection judgement, reducing engine shake, poor acceleration and other common breakdowns for Isuzu 4HK1, 6HK1, Sany SY365 and Hitachi excavator equipment.

The OTTO YA00068072 fuel feed pump is an electric fuel transfer pump designed for Isuzu 4HK1 and 6HK1 diesel engines fitted on Hitachi ZX200‑3 and ZX330‑3 excavators. This 24V electric pump delivers stable diesel supply from fuel tank to high‑pressure injection pump, ensuring consistent fuel supply under heavy‑duty working conditions. It adopts corrosion‑resistant housing, reliable internal motor assembly and sealed connector, resisting vibration, dust and moisture on construction sites. Strict flow and pressure calibration matches original engine fuel system requirements.

This professional T-rod bridge adjusting screw is processed with high-precision numerical control turning technology, featuring uniform thread density, smooth tooth surface and accurate stroke calibration. It can achieve fine and stepless clearance adjustment for engine valve mechanism and transmission system, effectively optimizing valve opening and closing timing and ensuring accurate and sensitive engine power output response.

This OTTO aftermarket fuel injector assembly is precision-manufactured to strict OEM standards, delivering stable high-pressure fuel supply performance. Designed for Isuzu 4HK1 and 6HK1 engine systems, it achieves accurate fuel atomization and quantitative fuel injection, which optimizes engine combustion efficiency. It effectively improves engine power output, reduces fuel waste, and maintains consistent operating performance of construction equipment under long-term working conditions.

This OTTO aftermarket ECU controller adopts strict OEM-quality manufacturing standards, featuring precise circuit calibration and stable signal processing capability. It perfectly matches the operating parameters of 4HK1 and 6HK1 engine systems, effectively controlling engine fuel injection, speed regulation and power output to ensure consistent and reliable excavator operation under various working conditions.

This OTTO premium intake air pressure sensor features high-sensitivity sensing chips and precision manufacturing technology, which can accurately monitor real-time intake air pressure data of the engine. It delivers stable and precise signal output under variable engine speed and load conditions, effectively assisting the engine ECU in adjusting fuel injection and air intake ratio to optimize overall engine combustion efficiency.

This OTTO 4HK1 high pressure fuel injection pump with part number 8-97306044-7 is a professional replacement part designed for multiple mainstream excavator models. It adheres to OEM dimensional and assembly standards, featuring accurate interface calibration that enables direct plug-and-play installation. It perfectly matches the fuel supply system of Hitachi and CASE excavators, eliminating modification work and greatly improving maintenance efficiency.

This OTTO premium high-temp sealing gasket with OEM part number 330-9847 is an essential sealing spare part designed for Caterpillar C4.4 diesel engines, perfectly matching CAT 318E medium excavators. Installed between engine mating surfaces, it forms a reliable isolating barrier to block lubricating oil, coolant and high-temperature combustion gas penetration, maintaining stable sealing performance under long-hour continuous heavy-load construction and quarry operations with drastic temperature fluctuations.

This OTTO OEM-grade full 4HK1 diesel engine assembly is a direct replacement power unit exclusively engineered for Hitachi ZX210LC-3, ZX240-3 and ZX270-3 medium crawler excavators, adopting original Isuzu AH-4HK1X four-cylinder water-cooled common rail turbocharged structure. Pre-assembled with cylinder block, cylinder head, turbocharger, intercooler, high-pressure fuel injection system, cooling & lubrication modules, wiring harness and flywheel assembly, it provides stable low-speed high torque to drive full hydraulic systems, perfectly restoring original machine performance for earthmoving, quarrying and municipal heavy-load construction work.