Description

Kato HD512III Parts Catalog – Factory Specs for the Fully Hydraulic Excavator

You pull a part off the shelf and it doesn’t fit the pin bore. That’s a half-day lost and a return shipping charge. The Kato HD512III Parts Catalog ends that. This is the factory-issued parts list, not a reprint. 321 pages of exploded views and OEM part numbers covering every system on the machine from serial number 8320 up.

Fuel System Breakdown – Not Just a Filter Number

The fuel system chapter (フュエルシステム FUEL SYSTEM) gives you the exact part numbers for injectors, lines, and the lift pump. Aftermarket catalogs often group fuel components into vague “fuel delivery” sections. This catalog lists every seal and banjo bolt individually. You order once and the part goes in without filing or grinding.

Boom, Arm, and Bucket: Matching Pins and Bushings

The front attachment section breaks the boom (ブーム BOOM), arm (アーム ARM), and bucket (バケット BUCKET) into individual exploded drawings. Each pin, bushing, and seal has its own reference number. If you’ve ever pressed out a worn bucket pin and had to measure with calipers because the aftermarket list was wrong, you’ll appreciate having the factory drawing on page 26. That page lists the pin diameter and length in millimeters – convert to imperial if you need to, but the spec is exact.

321 Pages of Component Indexing

This catalog runs 321 pages with a machine component parts index at the back. You get sections for the power train, slewing table & accessory, operating system, cooler & heater, track shoe, traveling frame, cab & accessory, and the full hydraulic piping set. The index lets you cross-reference part numbers back to the exploded view, so you never order a washer that belongs on a different machine. The Automotive Industry Overview is about general industry practice, but this catalog follows the same logic used in heavy equipment: parts are grouped by system, not by alphabetical listing.

Why OEM Documentation Beats Aftermarket Parts Lists

Aftermarket parts catalogs for excavators typically grab a part number from an old database and call it close enough. Close enough leaves you with a hydraulic leak or a boom that drifts. Kato issued this parts list for the HD512III with the same precision they use in their factory. The table of specifications (仕様一覧 TABLE OF SPECIFICATIONS) gives you fluid capacities and hydraulic pump flow rates. You need that data to confirm the replacement pump matches the original. Without it, you’re gambling on a $2,000 part. Automotive Industry Overview – the same principles apply to construction equipment: spec thyself.

Crane and Dozer Attachments: Optional Systems Covered

The catalog includes two optional sections at the end: crane attachment (クレーンアタッチメント CRANE ATTACHMENT) and dozer device (ドーザデバイス DOZER DEVICE). If your HD512III came with either of these, you get the same exploded-view treatment. The crane section shows the swing cylinder and hook assembly. The dozer section covers the blade frame and lift cylinders. No guesswork about which seal kit fits the dozer ram – the part number is right there in the drawing.

Who Needs This Catalog

If you are a maintenance supervisor or a heavy-equipment DIYer who does your own rebuilds, this parts catalog saves you the headache of machine downtime while you order three different parts hoping one fits. It’s also the reference you hand to the parts counter to stop them from trying to sell you a non-OEM alternative. Beginners: start with the front attachment section – it’s the most commonly replaced wear parts. The exploded views are labeled in English and Japanese, but the part numbers are universal.

Other Kato parts catalogs in the same format: KATO HD820III Fully Hydraulic Excavator Parts List, KATO HD2045 SUPER EXCEED Parts List, and KATO HD1430III Fully Hydraulic Excavator Parts List.

Does this catalog include torque values for assembly?

No. This is a parts catalog, not a service manual. Torque specs belong in the factory service manual, which is a separate document.

Can I use this for a HD512III with serial number lower than 8320?

The catalog is marked “Applicable Serial No. 8320 ~”. Machines built before that serial range had different part numbers for the boom arm assembly and some hydraulic piping. Ordering parts from this catalog for an earlier machine risks getting the wrong pin length. Check your serial plate before ordering. If you have an older machine, look for the earlier revision of this catalog – we do not stock that version.

Factory manuals like this one eliminate the back-and-forth of returning wrong parts. You get the number, you order it, you bolt it in. Access the Factory Manual from AutoRepairManuals and keep a copy on the tablet in the cab. It pays for itself on the first pin and bushing job.