Description

Kyokuto Kaihatsu PY21-51A Parts Catalog – 298 Pages of Factory Specs

When you’re elbow-deep in a concrete pump rebuild and the wrong seal shows up, you lose a day. I’ve been there. This Kyokuto Kaihatsu PY21-51A Parts Catalog is the only way to make sure you order the exact part the first time. 298 pages of OEM exploded views, reference numbers, and part descriptions – straight from the factory that built the machine.

You don’t need to guess which hydraulic fitting goes where. This catalog gives you the breakdown for the piston concrete pump with a three-stage folding boom mounted on an 8-ton chassis (PA-PK17210M). Every subassembly – from the pump unit ASSY down to the grease piping – is mapped out. Page 1 shows the pump unit assembly with callouts for each component. The item list on page 3 translates those numbers into Japanese part names. That’s the level of detail you need when a customer’s machine is down and you’re trying to cross-reference a part.

What’s Inside the 298 Pages

Open this catalog and you’ll find section after section of assembly drawings. The pump unit assembly, agitator gearbox ASSY, main cylinder ASSY, S-valve assembly, bracket assemblies – they’re all in there. The hydraulic piping section covers both low and high-pressure lines. There’s a dedicated page for the control panel and switch panel, plus the harness assembly. If you’re tracking down a solenoid valve, the catalog lists each one by its internal code (e.g., ソレノイドバルブASSY). For the beam assembly, the drawings show the piping for both concrete and hydraulic circuits. The last third of the book covers the chassis-specific drive controls – Isuzu, Hino, Mitsubishi, Nissan. Each drive control ASSY has its own exploded view.

Pump Unit Assembly Breakdown

Page 1 of the catalog is the pump unit ASSY drawing. It’s a big diagram with over 25 item numbers connected by lead lines. You see the concrete piston, main block, pilot valve, relief valve, and all the piping. Below that, the bill of materials lists each item number and the part name in Japanese. If you need the oil tank ASSY or the water tank ASSY, they’re on later pages. The beauty of a factory parts catalog is that the numbering system matches what’s stamped on the actual components. No aftermarket re-draw – this is the print Kyokuto Kaihatsu used at the factory.

3 Reasons to Rely on OEM Documentation

First, the part numbers are correct. I’ve ordered aftermarket “equivalent” parts that didn’t bolt up because the flange thickness was off. With this catalog, you take the number straight from the page. Second, the hydraulic and concrete piping diagrams show every tee, elbow, and hose length. Third, the catalog includes optional equipment – level sensor and indicator, auto-accelerator solenoid valve – that generic parts suppliers ignore. You get the real deal.

Does This Catalog Cover the Boom Assembly?

Yes. The beam assembly (ブームASSY) has its own multi-page section. It shows the 5B pipe variant, the boom hydraulic piping ASSY, and the boom concrete piping ASSY. The catalog also includes the outrigger assemblies – front and rear – with part numbers for each pad, cylinder, and mount bracket. If you’re rebuilding a boom, you’ll find every pin, bearing, and hose clamp drawn out.

Hydraulic Piping: Factory Routing

The hydraulic piping drawings aren’t just schematics – they’re physical layout diagrams. You see exactly how the pipes run from the pump to the valve block to the cylinders. The high-pressure water piping and lubrication piping are mapped separately. There’s a whole page for the unit water piping (high pressure). If you’ve ever tried to reroute a hydraulic line on a concrete pump without a diagram, you know why this matters. One wrong bend and you’re fighting clearance issues.

FAQ

Does this parts catalog include torque specs or repair procedures?

No. This is a parts catalog – it’s for identifying and ordering components, not for disassembly or reassembly. Torque values and service steps belong in the service manual.

How do I use the exploded diagrams to find a part number?

Start with the main assembly that contains your part – for example, the pump unit ASSY on page 1. Scan the diagram for the part you need, note the item number (1, 2, 3…), then flip to the item list on page 3. The list pairs each item number with a Japanese part description. That description matches the factory label. Write down the reference number from the left column (e.g., 6 for the S-valve ASSY) and use it to order from a dealer who can cross-reference the Kyokuto number. If you need the part for a specific chassis variant, check the drive control section in the back of the catalog – those pages cover Isuzu, Hino, Mitsubishi, and Nissan chassis separately.

Look, I’ve wasted hours on parts that were “close enough” but didn’t fit. This catalog eliminates that risk. You get the exact factory drawings, part numbers, and assembly breakdowns for the Kyokuto Kaihatsu PY21-51A concrete pump. No guessing, no ordering twice. Access the Factory Manual and keep it in your tablet case next time you tear down a pump.

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