IHI 40NX / 45NX Mini Excavator Parts Catalog (OEM)

• Covers the 2016–2020 IHI 40NX and 45NX mini excavators, detailing variants equipped with either rubber or steel shoes and specialized piping setups
• Identified as official IHI Construction Machinery Limited publication PUB.No.3, spanning 268 pages in a highly searchable PDF format
• Breaks down the equipment into 17 distinct sections, offering exploded-view diagrams of the lower machine, turntable, swing drive, and hydraulic circuits
• Serves as the primary part identification reference for the WG000001-series production run
• Details precise hardware for front idler assemblies, main control valves, rotary joints, boom cylinders, hydraulic oil tanks, oil pumps, and radiators
• Highlights OEM replacement components for air cleaners, fuel tanks, operator seats, TOPS canopies, remote control valves, wire harnesses, hoe attachments, and counter weights

Component and System Index

The IHI 40NX and 45NX master catalog maps out structural components and assembly variants for the entire chassis. You get a clear breakdown of the excavator's anatomy to streamline any repair or troubleshooting process. Detailed sections cover the exact layout of the lower machine, turntable assembly, and swing drive devices. It also isolates complex hydraulic piping configurations. This includes specific return and suction lines, boom swing controls, and control piping variants. Mechanics will find the high-precision detailed component views for traction and swing motor assemblies particularly useful for identifying the right replacement hardware.

By serving as a visual step-by-step guide through its assembly drawings and structural cross-sections, this parts catalog allows you to confidently handle complex component teardowns—such as rebuilding the main control valve, servicing the rotary joint, or overhauling track tensioners—in-house, saving you a costly trip to the dealership. Along with exploded-view diagrams, it provides hydraulic piping schematics and electrical wiring schematics detailing the harness routing.

Technical Preview and Component Data

Beyond part numbers, this catalog provides essential component data. It lists specific relief valve settings of 9860–10825 kPa (1430–1570 psi) for system calibration. You will find the engine cylinder volume specified at 1590 cc. Fluid capacity requirements note exactly 17 L (4.5 gal) for the transaxle assembly. Heavy equipment maintenance carries inherent risks. Always relieve hydraulic pressure before disconnecting lines and verify equipment stability prior to inspecting undercarriage assemblies. This official OEM parts reference is the definitive guide for identifying correct replacement components across all 40NX and 45NX variants throughout the 2016–2020 production run.