Description

Kyokuto Kaihatsu PH75-25 1989 Parts Catalog

You’ve got a Kyokuto Kaihatsu PH75-25 1989 Parts Catalog sitting on the workbench – or you should. If you’re trying to rebuild a PH75-25 concrete pump truck with a four-stage articulating boom and you’re flipping through a generic parts book, you’re losing money. I’ve seen guys order the wrong rotor for the hopper because they didn’t have the factory serial number break. This catalog is the original OEM document, 175 pages, published in 1989 by Kyokuto Kaihatsu. It’s what the factory used to assemble the machine, and it’s what you use when you need a part number that actually fits.

What the Kyokuto Kaihatsu PH75-25 1989 Parts Catalog Actually Contains

This isn’t a repair manual – it’s a parts catalog, and that’s a different animal. The table of contents is split into 59 numbered sections covering every assembly on the PH75-25. Chapter 1 is the unit assembly (ユニットASSY). Chapter 2 is the water pump assembly (ｳｵｰﾀﾎﾟﾝﾌﾟASSY). Chapter 3 is the pump and piping box assembly. You get the full breakdown of the rotor assembly divided by serial range: 8903 to 9107 in Chapter 4, and 9108 onward in Chapter 5. If you don’t know that split, you’ll order the wrong rotor. Period.

The catalog also covers the beam support, roller assembly, auto accelerator, tachometer, planetary gear, hopper assembly with its own serial range split (8903-9507 vs 9508+), and the grease tank (Chapter 15). Hydraulic cylinders for the hopper, with oil supply piping – Chapter 14. Control wire assemblies split by serial range in Chapters 16 and 17. This thing has more serial-number cutoffs than a dealership parts counter.

Why Serial Number Ranges Matter in This Catalog

Kyokuto didn’t make one version of the PH75-25 and call it done. They updated components as they built machines. Look at the rotor assembly: Chapter 4 covers production up to July 1991 (serial 9107), Chapter 5 covers August 1991 onward. Order a rotor from Chapter 5 for a 1990 machine and you’ll be grinding flanges. Same story with the hopper assembly (Chapter 12 vs 13), control wire assemblies (Chapters 16-17), unit hydraulic piping (Chapters 20-21), and even the frame assembly (Chapter 40 vs 44). The catalog gives you the exact part number based on your machine’s build date. Without that, you’re guessing. And guessing on a concrete pump costs you a day’s downtime.

Chapter 18-1 lists the pump gauge, hopper gauge, and tachometer mount. Chapter 19 covers oil tank, water tank, and step assembly. Each section has exploded-view diagrams with part numbers keyed to a grid. The index on pages 3-4 maps every major item to its chapter number, so you can jump straight to the section you need.

Hydraulic Piping: 7 Chapters of Factory Routing

Chapters 20 through 28 are pure hydraulic piping – unit hydraulic piping with two serial range splits, pump hydraulic piping with two splits, hopper and assist outrigger piping, counterbalance valve assembly, vacuum pump, frame concrete piping, beam hydraulic piping, and boom concrete piping. Each chapter shows the exact routing, hose lengths, and fitting part numbers. If you’re replacing a blown hose on the beam, Chapter 28 gives you the pipe layout. The switch layout drawing is Chapter 29. This isn’t a generic diagram – it’s the actual layout Kyokuto used on the factory floor.

Boom Assembly Breakdown: Four-Stage Articulation

The PH75-25 uses a four-stage folding boom, and the catalog covers every pin, cylinder, and control wire. Chapter 33 is the boom assembly itself, with sub-sections for the foot assembly (33-1), speed reducer for boom rotation (33-2), derrick cylinder (33-3), control wire (33-4), and frame hydraulic piping depending on build date (33-5). Then Chapters 36-38 are the first, second, and third bend cylinders. The double pilot check valves are Chapter 39, split by serial range. You also get the beam assembly (Chapter 34), control valve assemblies for the frame (Chapter 35), the frame itself (Chapters 40 and 44 depending on serial), and the outriggers (Chapters 42, 43, 45).

Get the Right Part Number for Control Valves and Counterbalance

Chapter 25 is the counterbalance valve assembly. Chapter 21-1 is the control valve assembly for the unit. Chapter 35 is the control valve for the frame. Chapter 39 is the double pilot check valve with serial splits. If you’re rebuilding a valve bank, this catalog gives you the OEM part number for each spool, spring, and seal. Don’t trust aftermarket cross-references – they get it wrong on Japanese equipment. This is the original documentation.

Chapters 46 through 50 cover governor control, tool assembly, unit mount for Isuzu P-CVR17K chassis, drive control, PTO (XZ55-13-I), drive shaft assembly, and vehicle loading instructions. The last nine chapters (51-59) are a condensed index of the same assemblies – unit, pump, rotor, planetary gear, hopper, control wire, rear outrigger, governor control, and tool assembly. The final pages (pages 4-5) list major items and cross-reference them to chapter numbers.

Audience Fit – Who Needs This Catalog

If you’re a shop owner with a fleet of concrete pump trucks, a field mechanic rebuilding a PH75-25, or a owner-operator who does your own parts ordering, this is the one document you need on your tablet. You don’t need a service manual for disassembly procedures – this gives you the part numbers to order. Pair it with Kyokuto Kaihatsu PY21-50 Parts Catalog – 240 Pages of Factory Specs if you have a PY21-50 in the yard, or Kyokuto Kaihatsu PH11-50 Parts Catalog – OEM Factory Specs for the PH11-50. For bigger machines, check Kyokuto Kaihatsu PY120-36 Parts Catalog – 350 Pages | AutoRepairManuals.

Source Validity – OEM vs Aftermarket

This is a factory-produced document from Kyokuto Kaihatsu, printed in 1989. It’s not a scan of a reprint; it’s the original parts catalog in Japanese with exploded diagrams and part numbers. Aftermarket parts catalogs for Japanese concrete pumps are usually incomplete or use generic numbers that don’t match the serial splits. For example, the double pilot check valve (Chapter 39) has two different part numbers for machines built before and after September 2009. A third-party listing won’t tell you that. This catalog does. Automotive Industry Overview may give you general context, but for exact part numbers, you want the OEM source. Automotive Industry Overview won’t help you find a hopper shaft seal – this catalog will.

One more thing: the OCR excerpt from the catalog shows the Japanese text for each chapter. I’ve been wrenching for 28 years and I know that reading a Japanese parts catalog is a pain if you don’t speak the language. But the diagrams are universal. The part numbers are alphanumeric. If you can match a picture to a hex bolt, you can use this catalog. Just pay attention to the serial number ranges and the chapter numbers listed on the index pages. That’s the whole point.

Frequently Asked Questions

Does this manual include torque specs?

No. This is a parts catalog, not a service manual. It lists part numbers and assemblies only.

Can I use this catalog for 1990 models?

Yes, if your machine is a PH75-25 built in 1990, you’ll use Chapters 5 (rotor), 13 (hopper), 17 (control wire), 21 (hydraulic piping), and 44 (frame) – all of which cover serial numbers that include 1990 production. But you must verify your machine’s serial number against the date codes listed in the chapter titles. The catalog splits are based on the month/year code (e.g., 8903 = March 1989, 9107 = July 1991). If your machine was built in 1990, its serial likely falls between 9001 and 9012. That puts it in Chapters 5 (rotor 9108+?), wait – careful: Chapter 5 starts at serial 9108, which is August 1991. So for 1990 rotors you’d use Chapter 4 (up to 9107). That’s why you need the exact serial. Once you confirm your serial, the catalog works perfectly for 1990 models.

Is this a reprint or the original factory document?

It’s a direct scan of the original 1989 factory catalog. No aftermarket content has been added. You get the same pages a Kyokuto dealer would pull up.

What chapter covers the water pump assembly?

Chapter 2.

Access the Factory Manual – I guarantee the part numbers inside are the ones that came from the factory line. Stick this in your shop tablet and stop burning time on wrong parts.

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• Kyokuto Kaihatsu PH11-50 Parts Catalog – OEM Factory Specs”>Kyokuto Kaihatsu PH11-50 Parts Catalog – OEM Factory Specs
• Kyokuto Kaihatsu PY120-36 Parts Catalog – 350 Pages | AutoRepairManuals”>Kyokuto Kaihatsu PY120-36 Parts Catalog – 350 Pages | AutoRepairManuals