Description

Kyokuto Kaihatsu PY120-36 Parts Catalog – Factory Part Numbers for the 25-Ton Concrete Pump

Order the wrong part for a concrete pump truck, and you are looking at a whole shift of downtime—maybe longer. I have seen guys guess on a seal kit and end up with a boom that won’t hold pressure. That is why you need the right documentation. The Kyokuto Kaihatsu PY120-36 Parts Catalog is a genuine factory document, 350 pages long, published by the manufacturer for their 36-meter four-section folding boom concrete pump truck. This is not a third-party compilation. It comes straight from Kyokuto Kaihatsu’s engineering department, the same people who designed the boom and the piston pump. If you are maintaining one of these rigs, you want the part numbers that match the steel you see on the lift.

Main Item Diagrams – Exploded Views for Positive ID

Page 2 of this catalog shows the main item diagram – a dense, numbered layout of every assembly on the truck. You will see the concrete piston assembly (item 7), the S valve assembly (item 9), the oil tank piping (item 20), and all the boom sections. Each number points to a specific part in the list on page 3. When you need to replace a cylinder tube or a bushing, you do not guess based on shape. You look up the item number, cross it to the part number, and order. The diagram is black and white, high-contrast, and the numbers are clear. This is the same layout used by Kyokuto dealerships.

Part Number System – How to Order Correctly

Page 1 of the catalog includes a sample order format. It tells you exactly how to write down the catalog number (P-CP-KH00217), the main item number, the symbol, the part number, the part name, and the quantity. The Japanese text is in katakana, all caps, because that is how Kyokuto’s computer system (KOINS) stores it. If you are ordering over the phone, you need to read the part number exactly as printed. One wrong digit, and you get the wrong hose assembly. This catalog gives you the correct codes.

For instance, the concrete piston cylinder tube carries part number VE12-M0071. That is not something you want to guess. Having the catalog on your bench means you read the number off the page, not off a worn-out stamp on the part.

Coverage of the PY120-36 Concrete Pump – What You Get

This parts catalog covers the GVW 25-ton class chassis-mounted concrete pump truck with a 36-meter four-section folding boom. It includes the pump hopper mount, piping assemblies, control panel mount, lubrication piping, oil cooler mount, swing arm, and all hydraulic valve groups. It also covers the wiring arrangement and switch layout. There are separate entries for pump units (9B ST2100 and 8B ST2100) with production date splits (～9901 and 9902～). The catalog accounts for engineering changes – any revision is noted with a date code. This matters when you need the correct S valve assembly for a 1999 chassis versus a 2001 model. You get the split.

Source Authenticity – Kyokuto Kaihatsu Direct Print

This is a direct scan of the original Kyokuto Kaihatsu parts catalog. There is no reprint, no reformatting. The Japanese text, the katakana conventions, and the line drawings are all factory-sourced. Aftermarket parts books often combine multiple models and miss critical updates. If you want to be certain that the part you order fits the PY120-36, use the OEM reference. Kyokuto Kaihatsu PY21-50 Parts Catalog – 240 Pages of Factory Specs covers a different model but follows the same standard. Kyokuto PH11-50 1987 Parts Catalog and Kyokuto PY21-51A Concrete Pump Parts Catalog are also available. For context on why OEM documentation matters in the automotive industry, see the Automotive Industry Overview and Automotive Industry Overview.

FAQ – Common Questions About the PY120-36 Parts Catalog

Does this catalog include torque specifications?

No. This is a parts catalog, not a service manual. Use it for part numbers only.

Can I use this catalog to rebuild the concrete pump engine?

This catalog covers the truck’s concrete pump and boom assembly, not the chassis engine. You need the chassis service manual for engine work.

How do I interpret the Japanese part names?

The catalog uses katakana in all caps for computer system management. For example, “ブッシュ” becomes “ブツシユ”. Cross-reference the item numbers and illustrations to confirm you have the correct part.

Is this the same catalog used by Kyokuto dealerships?

Yes. This is the exact same document that authorized service centers use for ordering replacement parts. It contains the official part numbers, item codes, and assembly breakdowns. The catalog number is P-CP-KH00217. If a dealer tells you they do not have a number, you can hand them this page.

You have the truck in the yard. The boom will not fold. You need a new seal or a cylinder. Stop guessing and start ordering the right component. Access the Factory Manual and keep it on your tablet or print the pages for the job. 350 pages of verified factory data – that is your insurance against the wrong part arriving on Monday.