Description

Aichi SR18AJ, SR21AJ, SR18A, SR21A Parts Catalog – Factory Specs for Aerial Lifts

If you’ve ever ordered an O-ring for an Aichi boom lift and ended up with the wrong size, you know the headache. This is the factory Aichi SR18AJ, SR21AJ, SR18A, SR21A Parts Catalog – 300 pages of exploded views and part numbers straight from the manufacturer. No aftermarket cross-reference. No guessing. If you need to find a valve block seal, a boom length sensor, or a counterweight bolt, this is the document you pull up before you pick up the phone.

300 Pages of Exploded Views and Part Numbers

Each section in this catalog is broken down by major assembly. The table of contents starts with INDEX 1 through INDEX 5, then ILLUSTRATIONS INDEX 1 through 12. After that come the actual parts lists. The Counter Weight section appears twice – once for the frame, once for the turntable. The Turntable section alone has six LIST groups covering everything from the solenoid valve unit to the angle sensors. You get exploded drawings with callout numbers that match the part number list. On page 2 the foreword explains how to read Level and Quantity columns. Use that before you order.

Level Codes: Understanding Assembly Hierarchy

The Level column on each list tells you if you are buying a complete assembly (1), a component within that assembly (2), or a sub-component (3). For example, if you need a boom length sensor, you find it under BOOM LENGTH SENSOR – two separate lists for different serial number ranges. The Level code helps you decide whether to buy the sensor assembly or just the internal parts. Read the foreword on page 2 once, and you will stop ordering assemblies when all you needed was a seal.

Does This Parts Catalog Include Torque Specs?

No. This is a parts list, not a repair manual. It gives you part numbers, class codes, and serial number application. For torque specs and service procedures, you need the separate service manual. That is why AutoRepairManuals also carries the Aichi SR18AJ/SR21AJ Operation Manual for daily use and the Aichi SR18AJ/SR21AJ Technical Manual for Aerial Lift for diagnostics. For full disassembly and reassembly with step-by-step instructions, get the AICHI SR18A/ISR60 SR21A/ISR70 Service Manual – Section: Final Item In Toc. Each manual serves a different job – use the right one.

3 Reasons OEM Parts Data Beats Aftermarket Cross-Reference

First, serial number specificity. Every list shows the exact serial number range where each part applies. Second, the illustrations match the real machine geometry – aftermarket catalogs often combine different revisions into one drawing. Third, the Class column on each list tells you if a part is available as a separate piece (C), only as a set (B), only as a repair kit (A), or not serviceable at all (D). Page 3 defines these symbols. Aftermarket databases rarely include these restrictions, and that is how you end up with a part that cannot be ordered alone. Use the factory data and skip the guesswork.

Turntable and Valve Blocks: Factory Part Lists

The catalog includes dedicated sections for Valve Block (Travel-R), Valve Block (Extension), Valve Block (Elevation), Valve Block (Rotation), and Valve Block (Travel-L). Each has its own LIST 1 and LIST 2. The Solenoid Valve sections appear multiple times – one for the proportional control valve, another for the pilot check valve. If you need the Rotary Actuator Assembly for the basket, it is listed under Basket Base. The Cover (Turntable) section has five different lists. Every hose, fitting, and bracket has a factory part number. You will not find this level of detail in a generic parts catalog.

Boom and Cylinder Sections: Avoid the Wrong Seal Kit

Each cylinder – Elevation, Leveling (Lower and Upper), Extension, and Fly Jib – has its own list. The Level column helps you choose between the complete cylinder or just the repair kit (Class A). The Booms section has five lists per model, plus Boom Tubing lists for internal hoses. If you order a seal kit without checking the serial number column, you may get a kit for an older revision. The catalog shows exact serial number applicability for each part. Boom Length Sensor appears twice – for different serial number ranges. Do not assume compatibility.

Is this the same as the service manual?

No. This is the parts catalog – part numbers only, not repair procedures or torque specs.

Can I use this catalog to identify parts without having the machine in front of me?

Yes, because each illustration and list corresponds to specific serial number ranges. The manual includes serial number applicability in the quantity column. You need to know your machine’s serial number. The catalog covers SR18A, SR18AJ, SR21A, SR21AJ with applied specification FR0,ER0. If you have an older or newer variant, check the serial number ranges in the lists. The foreword on page 2 explains how to read the level, class, and quantity columns. This is the same data Aichi dealers use for parts ordering. Having the correct part number before you open the tool box saves you a trip to the dealer.

Bottom line: If you maintain Aichi lifts, you need this on your laptop or tablet. Automotive Industry Overview may give you background, but this manual gives you part numbers. The Automotive Industry Overview has nothing on the SR18A counterweight bolt. Access the Factory Manual from AutoRepairManuals.com and stop wasting time on wrong parts.