IHI Model 55N Mini Excavator Parts Catalog (P/N PUB.No.2)

• Official OEM publication (PUB.No.2) for the IHI Model 55N Mini Excavator.
• Covers structural components, hydraulic systems, and track assemblies for serial range WP000001 and above.
• 321-page authoritative reference featuring 103 detailed exploded-view diagrams to illustrate component assembly and part relationships.
• Identifies original hardware down to the bolt, including track shoes, hydraulic piping, swing drives, and boom cylinder rebuild components.

Component Assembly Walkthrough

The catalog organizes the mini excavator's major subsystems into five specialized sections. Section 1 documents the lower machine. Here, you will find comprehensive breakdowns of crawler shoe assemblies, detailing variants for rubber crawlers, steel shoes, and specific link-chain configurations. Section 2 moves up to the turntable and swing bearing assembly. It outlines the mounting hardware and lubrication components critical for proper rotation. Section 3 covers the swing drive device. If you are tracing complex hydraulic architecture, Section 4 provides an exhaustive list of the piping. It maps out return and suction lines, pump discharge paths, and control valve connections across various lever setups.

Specification Highlights

This manual provides factory technical data to assist with precise parts identification and system maintenance. The hydraulic system relief pressure is established at 9860–10825 kPa (1430–1570 psi) for standard operations. Traction motor assembly fastening requires torque values documented at 113 N·m (83 lb-ft). Boom cylinder assemblies utilize a 50 mm bore diameter for load-bearing applications. The standard hydraulic tank volume holds 90 L (23.8 US gal). Always verify system depressurization and component integrity before attempting service. Original factory documentation and proper technical training remain essential for safe workshop operations and machinery maintenance.