Description

Aichi SR123, ISR403 Parts Catalog – OEM Factory Parts List

I’ve been turning wrenches for 28 years. One thing I’ve learned: ordering the wrong part costs you a day. This Aichi SR123, ISR403 Parts Catalog is the factory list — not some aftermarket compilation that guesses at supersessions. You get the exact exploded views, level codes, and part numbers for every assembly on these crawler lifts. No guesswork, just the data Aichi issued.

Factory parts ordering starts with the correct reference. This catalog runs 253 pages, covering everything from the crawler tracks to the boom tubing. The table of contents alone is laid out with multiple indices and illustration indexes — ten of them — so you can find what you need without flipping through every page. Access the factory manual and keep it on your tablet or print the section you need.

Crawler and Travel Motor Listings

Undercarriage parts are often the first to wear. The catalog breaks the CRAWLER section into three lists per model, plus TRAVEL MOTOR with up to four lists. Each list shows the assembly level — 1 for main, 2 for sub-assembly, 3 for individual parts — and the quantity per machine. If you need a travel motor seal kit or a track roller, you trace it through the level column. Also includes the swivel joint, lock swing, and weight assembly. AICHI Parts List SR-123/ISR403 references the same structure for companion manuals.

Does This Catalog Cover the Engine and Mounting?

Yes. Under ENGINE & MOUNTING you get three lists. List 1 covers the engine itself — block, head, injection pump, alternator, starter. List 2 handles mounting brackets and vibration dampers. List 3 includes air intake and exhaust components. Each part number is cross-referenced against the serial number range printed at the top of the page. If your machine serial falls within the range, the part is correct. No aftermarket catalog gives you that level of precision.

253 Pages of Exploded Diagrams

Every major section includes an ILLUSTRATIONS INDEX — nine separate indexes for different assemblies. The BOOM section alone has five lists, each with its own exploded view. You see the exact orientation of seals, bushings, and pins. The LEVEL column tells you whether a part is sold as an assembly (symbol A) or as individual pieces. If the symbol A appears, you order the assembly part number listed next to it. The foreword explains every symbol: R for reworked, C for substitute, K for service kit component. Read those two pages before you order anything.

Get the Right Part Number the First Time

Waste no time with wrong fits. This catalog includes multiple indexes — INDEX 1 through INDEX 6 — that cross-reference part numbers by numeric sequence. You can start with a part number you already have and find where it appears in the lists. The serial number cut-offs are printed in each list header. Always check your machine’s serial number (last four digits) against the table. The catalog covers applied specifications A8,20,10,25 starting from serial 98100000. Aichi SR18AJ SR21AJ SR18A SR21A Parts Catalog – 300pp OEM follows the same indexing system if you work on broader Aichi models.

Engine & Mounting: What the Lists Contain

Look at ENGINE & MOUNTING LIST 1. You’ll find the cylinder block assembly, pistons, rings, bearings, cylinder head, valves, timing gears, and the injection pump. LIST 2 adds the mounting brackets, rubber isolators, and hardware. LIST 3 covers the air cleaner, exhaust manifold, and muffler. Each part has a drawing number reference. The catalog also includes the FUEL TANK list, PUMP & DRIVE list, and OIL RESERVOIR lists — all critical for hydraulic system rebuilds. Aichi SR12B SR12BJ ISR40B ISR40BJ Parts Catalog – OEM Factory List is a similar resource for related chassis.

Valve systems get dedicated attention: CONTROL VALVE, SOLENOID VALVE, PRIORITY VALVE, COMBINATION VALVE, DOUBLE PILOT CHECK VALVE, SHUTOFF VALVE, THROTTLE CHECK VALVE. Each is a separate list with its own parts breakdown. Hydraulic cylinder sections cover ELEVATION CYLINDER, EXTENSION CYLINDER, LEVELING CYLINDER (lower and upper), FLY JIB CYLINDER, and their associated counter balance valves and pilot check valves. The CRAWLER TUBING and TURN TABLE TUBING sections list every hose and fitting by length and end type. If you’re replacing a leaking hose, you need the exact part number from these lists — generic hose assemblies don’t carry the same bend angles.

Safety decals are also cataloged under DECALS LIST 1 and 2. If a decal is missing or damaged, you get the correct part number for replacement. The SAFETY WALK section lists walkway and handrail components. Automotive Industry Overview provides context on OEM documentation standards, but for Aichi-specific parts this catalog is the only source you should trust.

Frequently Asked Questions

Does this catalog include part numbers for the swing reducer?

Yes, listed under SWING REDUCER and REDUCTION GEAR sections.

How do I know if a part number is for my machine’s serial number?

Each list header shows the serial number range (last four digits) that the parts apply to. The foreword explains that when ordering you must state the machine model and serial number in addition to the part number and quantity. The catalog uses a level column: 1 for main assembly, 2 for sub-assembly, 3 for individual parts. Symbols like A (assembly) or C (substitute) tell you how the part is supplied. Always match the serial range printed on the page — if your machine falls outside the range, that part may not fit. The applied specification code (A8,20,10,25) also appears on the cover page; verify it matches your machine’s spec plate.

If you’re tired of chasing wrong parts, get the factory source. Access the Factory Manual from AutoRepairManuals and keep this 253-page reference on your bench. Automotive Industry Overview