Description

Aichi RZ-090 Parts Catalog – Factory OEM Parts List

You order a seal kit for the Aichi RZ-090 Parts Catalog based on a third-party cross-reference and the boom cylinder still leaks. That hour of downtime costs more than the manual. This is the factory list straight from Aichi Corporation in Ageo, Japan – 121 pages of part numbers, assembly breakdowns, and ordering codes that actually match the machine on your lot.

I have torqued enough bolts to know that aftermarket catalogs get hydraulic hose lengths wrong and skip the little bracket nobody remembers until the travel motor won’t line up. This document kills that. Every component from the crawler assembly to the upper control box is drawn with a parts list that includes the level indicator – a “1” for assemblies, “2” for sub-assemblies, “3” for the individual bits. No guessing whether that seal comes with the cylinder or separate.

Engine & Mounting Section: What You Actually Get

The ENGINE & MOUNTING section (three pages of list) covers every bolt, bracket, and isolator for the power unit. Page references are built into the catalog structure – not a separate torque sheet. You see the part number, the quantity per machine, and the serial number range where it fits. The FUEL TANK section follows the same logic: tank, cap, sending unit, lines. One list, one source. If you are swapping a fuel pump on an RZ-090, you need the pump assembly page – not a generic pump from a supply house that may or may not have the right mounting flange.

Fuel Tank and Pump Assembly: OEM Part Numbers That Match

Fuel system parts are the ones that get swapped out wrong most often. The FUEL TANK and PUMP ASSEMBLY sections give you the exact Aichi part number for the tank, the pickup, and the pump. No “this should work” – you get the OEM reference. The catalog also lists the symbol “A” for assemblies that are supplied as a unit, so you know not to break down a sealed pump housing. If the symbol “K” appears, those parts are available in a service kit – you buy the kit, not the loose parts. That kind of detail saves a reorder.

Crawler and Travel Motor Breakdown: Don’t Miss a Bolt

The CRAWLER section with its three lists covers track frames, rollers, sprockets, and idlers. Each list ties to an exploded view in the original manual. The TRAVEL MOTOR section is separate – you get the motor assembly, the brake, the planetary gears. If you are rebuilding a travel motor, you need the part numbers for the internal seals, not just the motor case. This catalog gives you those sub-levels: level 3 for the O-rings and backup rings inside the motor. Automotive Industry Overview may cover vehicle design, but it won’t tell you which wear ring fits this motor.

Hydraulic Cylinder Listings: Cylinder, Elevation, Extension

You have six different cylinders on this machine – boom elevation, boom extension, leveling upper and lower, plus the cylinder section under CYLINDER. Each one gets its own page with part numbers for the barrel, rod, seals, and piston. The COUNTER BALANCE VALVE and PILOT CHECK VALVE sections are separate, so if you need the valve that bolts to the cylinder, you look in those lists, not guess. Using the wrong valve on an elevation cylinder can drop the boom. The catalog shows the assembly “A” if the valve comes with the cylinder, or a separate part number if it is a distinct item.

What Makes This an OEM Parts Catalog – Not a Reprint

This is a scanned original from Aichi Corporation. The ABBREVIATION list on page 3 explains every code – AC, BRG, CYL, W/, W/O. The FOREWORD (page 2) tells you exactly how to order: include model, serial number, part number, quantity. The symbol “C” means a substitute part may be used – same function, different manufacturer. That is OEM honesty. Aftermarket catalogs leave that out. Related manuals from Aichi include the Aichi SR18AJ SR21AJ SR18A SR21A Parts Catalog – 300pp OEM and Aichi SR12B SR12BJ ISR40B ISR40BJ Parts Catalog – OEM Factory List. For a complete set, check Aichi SR12B, SR12BJ, ISR40B, ISR40BJ Parts Catalog – Factory OEM. You can also read about the Automotive Industry Overview for context on manufacturer documentation standards.

Does This Catalog Cover the Hydraulic Tubing?

Yes. CRAWLER TUBING, TURN TABLE TUBING (six lists), BOOM TUBING (two lists), and DECK TUBING are all there. Each list gives the part number for the hose assembly or tube, plus the fittings. If you are replacing a blown hose on the turntable, you find the exact assembly under TURN TABLE TUBING 1 through 6 – not a generic hose by length. That is how you avoid a crimped hose that rubs against the frame.

Does this catalog include torque specs for assembly?

No. This is a parts catalog, not a repair manual. It lists part numbers and assembly levels. Torque values are in the service manual for the RZ-090.

What does the “A” symbol in the remarks column mean?

The part is supplied as an assembly only, not as loose items. For example, a travel motor assembly with “A” means you order the whole unit, not the internal bearings separately. The assembly part number is stated following the “A” symbol on the same line.

Can I use this catalog for the RZ-090A or later serial numbers?

The catalog lists serial number ranges (last four digits) for each part. If your machine serial falls outside those ranges, the part may not fit. Check the serial on your machine against the “Serial No. of machines” column in each list. Aichi updated parts over production years – this catalog covers the original RZ-090 specification A3.

What does “AR” in the quantity column mean?

Quantities as required. You order how many you need – the catalog does not lock you into a fixed number. Common for seals, adhesives, or small hardware.

You can spend an hour cross-referencing a part number from a worn-out sticker, or you can open this 121-page OEM Parts Catalog and find it in the right group. I have done both. Access the Factory Manual and stop wasting time on parts that don’t fit.