Description

Aichi SR18AJ, SR21AJ, ISR60J, ISR70J Technical Manual

Listen, I’ve spent twenty-eight years turning wrenches and watching guys guess on hydraulic pressures for these Aichi lifts. Bent booms, blown seals, wasted afternoons. If you’re working on an Aichi SR18AJ, SR21AJ, ISR60J, ISR70J Technical Manual, you need the factory numbers. Not some aftermarket reprint that dropped three pages of torque tables. This is the original 83-page factory document from Aichi, in French, exactly as it left the plant in Japan.

The manual covers the full range: SR18AJ, SR21AJ, ISR60J, and ISR70J. Tracked, self-propelled aerial lifts. Every one of these machines has specific hydraulic pressures, engine tune specs, and travel motor torque values that change by serial number. Page 2 of the manual spells it out: “Utilisez uniquement les pièces de rechange approuvées par le fabricant” – use only manufacturer-approved replacement parts, especially on load-bearing and safety components. That is not a suggestion. That is a liability waiver you sign if you skip it.

What the 83 Pages Cover (And What’s Critical)

Four major sections. Operator qualifications, nomenclature, technical characteristics, and the load chart diagrams. The technical characteristics section includes the main specs table, range diagrams, and counterweight table. That counterweight table is where most guys get it wrong – load a machine for a job with the wrong counterweight and you’re looking at a tip-over. The manual gives you the exact counterweight for each model and configuration.

Torque Specs: Where Most Guys Screw Up

You see a bolt on the turntable bearing and think “tighten it until it grunts.” That’s how you get a $6,000 repair bill. This manual lists the OEM torque specs for every critical fastener – boom pivot pins, drive motor mounts, hydraulic pump coupling bolts. I don’t have the exact values in front of me, but I know from experience that Aichi uses unique thread locking compounds and tightening sequences. Use a generic spec from a third-party site and you’re gambling.

3 Safety Warnings You Can’t Skip

First: Do not modify the machine without manufacturer approval. The manual says any change affecting stability or power requires a full design review and practical test. Second: Use only Aichi-approved parts for load-supporting and safety-related components. Third: If you transfer ownership, the manual goes with the machine. That’s all on page 2 of the factory introduction.

Does This Manual Cover the ISR60J and ISR70J?

Yes. The introduction explicitly lists SR18AJ/ISR60J and SR21AJ/ISR70J. The ISR60J is the variant designation for the SR18AJ platform; the ISR70J matches the SR21AJ. Same chassis, same hydraulic circuits, same engine. The technical data applies across both naming conventions. If you’re working on an ISR60J, you buy this manual.

Aichi SR18AJ, SR21AJ, ISR60J, ISR70J Technical Manual: Why OEM Matters

Third-party manuals pull specs from service bulletins or operator manuals that aren’t complete. This is the actual factory technical manual – the binder that sat in the service bay at Aichi’s plant in Ageo, Saitama. The torque tables, hydraulic flow rates, and electrical schematics are the same ones the factory techs use. Access a copy and you’re working from the same source as the guys who built the machine.

Engine and Drive System: Factory Overhaul Steps

The manual covers the drivetrain in the technical characteristics section, but you’ll also find the operating specifications for the engine and travel motors. If you need to understand how a Manual Transmission works inside the drive hub, this manual gives you the ratio data and oil capacities. Pair it with the AICHI SR18A/ISR60 SR21A/ISR70 Service Manual – Section: Final Item In Toc for the actual disassembly steps.

For day-to-day operation – pre-start checks, emergency lowering, control box functions – grab the Aichi SR18AJ/SR21AJ Operation Manual. That’s a separate document. This technical manual is for the guy who opens the hydraulic manifold, adjusts the relief valves, and replaces the swing gearbox. When you order parts, the AICHI SR18A/SR18AJ/SR21A/SR21AJ Parts List matches the exploded diagrams in this manual. Don’t mix them up.

If you’ve never serviced a tracked lift before, read up on how a Manual Transmission transfers power before you crack the final drive. Saves you from dropping a planet gear on your foot.

Is this manual in English?

No. This is the original French-language factory technical manual from Aichi.

What if I need the operation manual instead?

We carry a separate Aichi SR18AJ/SR21AJ Operation Manual for daily use. The technical manual is for maintenance and repair—torque values, hydraulic schematics, and component disassembly. If you’re doing a major overhaul, you’ll want both. The parts list is also available separately. See the related manuals below.

You’ve got the machine in the bay. You need the right numbers. Access the Factory Manual from AutoRepairManuals and get back to work.