2011–2016 IHI 40NX / 45NX Mini Excavator Parts Catalog (PUB.No.3)

IHI Construction Machinery Limited's PUB.No.3 is the parts catalog for the 2011–2016 IHI 40NX and 45NX mini excavators, starting at serial WG000001. Assembly drawings and parts lists support component identification and repair planning.

Text search and drawing detail: The PDF has partial OCR text search and bookmarks for the main sections and parts index. Some pages and many part-number entries are not searchable. Small drawing callouts are easier to read when enlarged.

• Undercarriage and swing: Crawler shoe and adjustment assemblies, front idlers, upper and lower rollers, turntable and swing bearing, plus traction and swing motor breakdowns.

• Hydraulic components: Section views and parts lists for main control valves, remote control valves, rotary joints, oil pumps, hydraulic oil tanks, and cylinder assemblies.

• Controls and piping: Return and suction, pump discharge, boom swing, and control piping; change-pattern valves, short-lever controls, and engine deceleration components.

• Power unit: Engine and accessory listings, radiator and oil cooler, air cleaner and muffler, fuel tank and piping, and oil-pump drive components.

• Body and electrical equipment: Operator seats, standard and TOPS canopies, counterweights, instrument panels, wire harnesses, lamps, relays, and battery fittings.

• Attachments and options: Hoe and blade assemblies, standard and long arms, spare-port piping, operator-room equipment, and crane-specific hydraulic and electrical parts.

This catalog suits parts staff and mechanics who can read exploded drawings and match assembly callouts to parts lists.

Serial-Specific Parts Selection

The lists connect each drawing's key numbers to part numbers, quantities, interchangeability symbols, and serial applicability. These distinctions matter when ordering replacement components: the 45NX arm-cylinder listing changes from assembly 0782 233 UA through WG000662 to 0782 301 UA from WG000663 onward.

The corresponding piston-rod and cylinder-tube entries carry the same production break. Checking those entries together helps avoid mixing components from different cylinder versions during repair.

The catalog's applicability information refers to factory-shipped equipment. Modifications made through local service updates require the related update information.

Hydraulic Assemblies and Control Variants

The Traction Motor Ass'y breakdown separates the motor and reduction-gear components. Control Valve Ass'y drawings include lettered section views through the valve blocks, while Rotary Joint Ass'y identifies the hub, shaft, and seal-kit components.

Control-piping and valve listings distinguish A-B, A-D, A-B-G, and A-F change configurations. Short-lever versions have their own piping, remote-valve, and control-lever entries, so the installed control arrangement matters when selecting parts.

Cylinder listings distinguish boom, arm, bucket, boom-swing, and blade assemblies. Boom-cylinder entries also separate versions for cabin and TOPS equipment.

Engine Accessories, Electrical Layouts, and Crane Equipment

The power-unit pages identify complete engine assemblies and external equipment, including cooling components and the oil-pump drive. They support parts selection around the engine; internal engine overhaul procedures are outside the catalog's scope.

Electric System and Instrument Panel Ass'y drawings locate harnesses, switches, relays, and related hardware. These are component layouts, rather than circuit wiring diagrams or electrical diagnostic charts.

The crane section adds hook-block, angle-indicator and detector, controller, and holding-valve parts. Separate electrical and controller entries distinguish canopy, cabin, and TOPS configurations.

Parts Reference and Repair Scope

This is a parts reference for repair planning, with exploded drawings and component section views. It does not provide step-by-step teardown, overhaul, pressure-setting, or calibration procedures.

Always relieve hydraulic pressure before disconnecting lines and verify equipment stability prior to inspecting undercarriage assemblies.

A Preview of Cataloged Bucket Sizes

These entries are a small sample of the component sizes recorded in the parts lists.

The 40NX standard hoe bucket is listed as 0.13 m³ with a 600 mm width. The 45NX standard entry is 0.15 m³ with a 650 mm width.

The same sheets distinguish reinforced buckets and CE versions with hooks, keeping bucket size and equipment configuration together for parts identification.

Printable PDF and Included Pages

One printable PDF contains English descriptions alongside Japanese part names. The 361-page PDF includes 270 pages of assembly drawings and parts lists, a 23-page parts-number index, one cover, five preface and catalog-use pages, 15 section dividers, and 47 memo pages; all are included in the total.