IHI 40NX / 45NX Mini Excavator Parts Catalog, 2011–2016 (P/N 3)

IHI Construction Machinery Limited's parts catalog, P/N 3, covers the 2011–2016 IHI 40NX and 45NX mini excavators, starting at serial WG000001. Assembly drawings and parts lists support component identification and repair planning.

Printable PDF, Text Search, and Section Bookmarks

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.

The single printable 361-page PDF contains 270 pages of assembly drawings and parts lists and a 23-page parts-number index. That total also includes one cover, five preface and catalog-use pages, 15 section dividers, and 47 memo pages. English descriptions appear alongside Japanese part names.

Undercarriage, Hydraulics, and Attachment Parts

The highlights below are a selection of the catalog's contents, not a complete table of contents. Other entries include traction-alarm equipment and cab-heater assemblies with defroster components.

• 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

Drawing key numbers correspond to parts-table entries showing part numbers, quantities, interchangeability symbols, and serial applicability. These details support replacement-parts selection across production changes.

For the 45NX arm cylinder, assembly 0782 233 UA applies through WG000662, while 0782 301 UA applies from WG000663 onward. The piston-rod and cylinder-tube entries change at the same break.

Checking those related entries together helps avoid mixing components from different cylinder versions during repair.

Applicability refers to equipment as shipped from the factory. Machines modified through local service updates require the corresponding update information when selecting parts.

Hydraulic Assemblies and Control Variants

The Traction Motor Ass'y breakdown separates the motor from its reduction-gear components. Control Valve Ass'y drawings show lettered sections through the valve blocks.

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 separate piping, remote-valve, and control-lever entries, making the installed control arrangement relevant to parts selection.

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

Engine coverage: The power-unit pages identify complete engine assemblies and external equipment, including cooling components and the oil-pump drive. Internal engine overhaul procedures are outside this parts catalog's scope.

Electrical layouts: Electric System and Instrument Panel Ass'y locate harnesses, switches, relays, and related hardware. They show component arrangements rather than circuit wiring diagrams or electrical diagnostic charts.

The Mirror & Light Ass'y note specifies paired interchangeability for the wire harness and relay at keys 26 and 27. Their replacement versions need to be matched together.

Crane equipment: Dedicated listings identify hook-block, angle-indicator and detector, controller, and holding-valve parts. Electrical and controller entries distinguish canopy, cabin, and TOPS configurations.

Parts Reference and Repair Scope

Exploded drawings and component section views document parts relationships for repair planning. The catalog 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

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.