Description

Aichi RV-123, IRV403-90 Parts Catalog – Why You Need the Factory List on the Bench

If you’ve ever ordered a part for an Aichi aerial lift from a third-party list and got the wrong seal or a valve that doesn’t fit, you know the cost of guesswork. Aftermarket catalogs miss the column that tells you if a part is supplied as an assembly or if there’s a substitute. That’s how you wait three weeks for a part that was sitting on the shelf under a different number. This Aichi RV-123, IRV403-90 Parts Catalog is the one the factory uses. 126 pages of genuine part numbers, exploded views, and ordering codes that match the serial number on your machine. No reprints, no scanned garbage – original OEM PDF.

Engine, Fuel, and Valve: What’s Covered in This 126-Page Catalog

The table of contents splits the machine into logical groups. You get ENGINE with LIST1 and LIST2 – that covers the block, head, gaskets, and all the fasteners. FUEL TANK has its own section, and so does the PUMP and the OIL RESERVOIR. The VALVE section is split into CONTROL VALVE and SOLENOID VALVE, each with multiple lists. That matters because the control valve block on the RV-123 has different port configurations than the IRV403-90. The factory list shows you exactly which stem, spring, and plug belong to your serial number range. Page references are built into each group number so you can find the right exploded diagram fast.

Why Original Aichi Documentation Beats Aftermarket Copies

I’ve seen too many guys print a parts page off some random site and end up with a solenoid that has the wrong coil voltage. The Aichi factory catalog includes the remarks column – codes like A (assembly only), N (semi-finished), C (substitutable part), and K (service kit component). Aftermarket catalogs strip those out. Without those codes you order a loose part that was never sold separately. The FOREWORD on page 2 of this catalog spells out exactly how to read the LEVEL column: 1 for assembly, 2 for component, 3 for sub-component. That’s the difference between ordering a travel motor assembly or one bearing inside it. Don’t trust third-party lists on this.

Crawler and Travel Motor: Finding the Right Part Number

Both the RV-123 and IRV403-90 use crawler undercarriages. The catalog dedicates CRAWLER sections (LIST1, 2, 3) and TRAVEL MOTOR sections (LIST1, 2, 3). If you need a sprocket, track roller, or hydraulic motor seal, you go straight to those groups. The parts are listed by figure number and group number, and the quantity column tells you how many per machine. For the travel motor, the manual also shows which repair kit (R/K) and packing kit (P/K) apply. That saves you from buying a full motor when all you need is a wiper seal. The alternative is ordering blind from a generic list that lumps everything under “hydraulic motor.” Waste of time.

Cylinder and Control Valve: Avoiding Mismatch

The LIFT CYLINDER, JACK CYLINDER, and EXTENSION DECK CYLINDER each have separate lists. Same for the PILOT CHECK VALVE. If you swap a cylinder from an older RV-123 into an IRV403-90 without checking the part number, you’ll get the wrong port thread or stroke length. The factory catalog lists each cylinder by serial number range (latter four figures in the remarks column). The CONTROL VALVE sections (LIST1, 2, 3) break down every spool and spring. I’ve seen shops order a valve section that looked the same but had a different relief setting. That’s how you pop a hose. This catalog prevents that.

Get the right part number the first time. Access the Factory Manual now.

Decals and Safety Walk: Don’t Overlook These

The last sections of the catalog cover DECALS (LIST1, 2) and SAFETY WALK. Those decals contain load ratings, caution labels, and compliance markings. If you’re rebuilding a unit or replacing damaged decals, the part numbers are listed with the correct machine application. The SAFETY WALK section includes the rubber tread material used on the deck. Ordering the wrong length means cutting and splicing on a safety surface – not acceptable. This catalog gives you the exact OEM part.

Related manuals you might need for Aichi equipment:

• Aichi RV-093 RV-123 Aerial Platform Operator Manual
• Aichi SR18AJ SR21AJ SR18A SR21A Parts Catalog – 300pp OEM
• Aichi SR12B SR12BJ ISR40B ISR40BJ Parts Catalog – OEM Factory List

For context on why OEM documentation matters across the Automotive Industry Overview, Automotive Industry Overview shows how factory specs prevent liability and rework. Same principle applies to aerial work platforms – don’t handle it with copies.

Does this catalog cover both the RV-123 and the IRV403-90?

Yes. The cover states “MODEL RV-123/IRV403-90” and the applied specification is A2. All sections apply to both models unless noted by serial number range in the remarks column.

What is the LEVEL column and why does it matter?

The LEVEL column tells you if a line item is an assembly (LEVEL 1), a component of that assembly (LEVEL 2), or a sub-component (LEVEL 3). If you order a LEVEL 1 item you get the whole assembly; LEVEL 2 gives you the part individually. Misreading it means ordering a complete control valve when you needed only a spool.

Are torque specifications included in a parts catalog?

No. This is a parts catalog, not a service manual. It lists part numbers, quantities, and ordering codes. Torque values and repair procedures are in the separate service manual.

How do I use the remarks symbols like A, N, C, K?

The FOREWORD explains each: A means supplied as assembly only, N means semi-finished, C means a substitute part exists, K means the part is in a service kit. When ordering, you must request the part number listed after the symbol. Ignoring these codes will get you the wrong item – for example, ordering a loose part that only comes in an assembly.

If you’re working on an Aichi lift and you want to stop chasing wrong parts, access this catalog. It’s 126 pages of factory-correct numbers. No filler, no generic lists. Access the Factory Manual.