Description

Hino DG550 Parts Catalog – 1984-1997 Factory Edition

If you are working on a Hino DG550 and need to know which part number goes where, stop flipping through aftermarket websites that show you a blurry photo and hope you guess right. I have been wrenching for 28 years, and I will tell you straight: without this Hino DG550 Parts Catalog, you are wasting time hunting for a wheel cylinder that might not even fit your year. This is the same book Hino dealerships used to order parts back when these trucks were still on the assembly line. 123 pages, printed from the original factory files, covering model years 1984 through 1997. Every exploded diagram, every part number, every fastening spec comes from the OEM source — not some third-party compiler who thinks a #10 bolt is the same as a M12.

Model Determination and Year-Specific Coverage

The first thing you need to know: the DG550 had multiple variations depending on the model year, and the wrong parts will cost you a day of downtime. Section A starts with a model designator chart (page A-2) and a model availability table that tells you exactly which chassis codes were sold for each year. The manual also lists the corresponding parts catalogs and workshop manuals you might need alongside this one. If you are swapping a cab panel on a 1988 DG550, you turn to Section G, where the FD/FE/DG/FF/SF/SE cab panels are broken down by year group: 1988-1992 on page G-4, 1993-1997 on page G-10. That kind of granularity keeps you from ordering a grille that belongs to a 1985 model.

Brake System: Full Air and Air-Over-Hydraulic Parts

Brakes are where I see most DIYers screw up — they buy a “universal” brake chamber and wonder why the pushrod length is off. Section F of this catalog covers the complete brake system, from I-beam exchange brake shoes (page F-1) to manual and automatic slack adjusters for full air systems (page F-13). Front and rear brake drums are listed separately, with part numbers for 1984-1997 models. You also get the wheel cylinder repair kits (page F-4) and master cylinder assemblies. Air brake valve assemblies are split into air-over-hydraulic and full air systems — the catalog does not mix them, so you order the correct control valve the first time.

7 Systems Covered – From A/C to Electrical

Starts at Section B with air conditioning and heating: receiver dryers, expansion valves, idler pulley assemblies. Section C covers accessories like block heaters, radio kits, stainless wheel liners, and locking fuel caps. Section D gives front and rear axle bearings plus transmission overhaul bearing kits. Section E is short — three drive belts: alternator/water pump, power steering, A/C compressor. Section G includes paint codes (page G-1), cab panels and trim, seat assemblies, and lamp assemblies with lens diagrams. Section H has transmission shift cables, cab release cables, throttle and accelerator cables, speedometer cables. Section I is chassis: shock absorbers, front and rear spring assemblies, power steering gearbox and pump, tie rod ends, king pin sets, axle shafts, lug nuts, wheels, valve stems. Section J handles clutch and flywheel: release bearings, master and slave cylinders, straight pin for alignment. Section K covers cooling: water pump, thermostat, radiator cap and hoses. Section L is electrical: rebuilt starters and alternators, fusible links, battery box covers, horns, turn signal assemblies.

ESX Override? No – This Is a Parts Catalog, Not a Repair Manual

Let me be clear: this is a parts catalog, which means it gives you OEM part numbers, diagrams, and assembly breakdowns — but not step-by-step repair instructions or wiring diagrams. If you need the actual service procedures, you want the corresponding workshop manual. The catalog references workshop manuals on page A-5, so you know which one to buy. I have seen guys order this thinking it will tell them how to rebuild a transmission. It will not. What it will do is give you the exact bearing kit part number so you do not order a D-1 kit when you need a D-2. For your reference, check the related Hino 258 Parts Catalog if you work on that model, or the Hino P11C Engine Parts Catalog for engine-specific parts. The Hino Rainbow P-RH 160 Instruction Manual is a different beast entirely — that one has operator instructions.

Source Validity: OEM Print vs. Aftermarket Copy

I have been burned by aftermarket parts catalogs that list a part number that was superseded in 1991. This catalog was originally published by Hino Diesel Trucks (U.S.A.) Inc. for the North American market. The scan is from the official factory document — not a photocopy of a copy. The part numbers, diagrams, and year splits match what you would get if you walked into a Hino dealer in 1995. That matters when you are ordering a brake shoe retracting spring (page F-11) and the spring rate has to be right. If you want to understand why OEM data matters in the broader Automotive Industry Overview, read the history of parts standardization. And if you are curious about how the engine components fit into the bigger picture, the Internal Combustion Engine article covers fundamentals.

Does the Catalog Include Torque Specifications?

Not as a separate section — torque values are not printed in a parts catalog format. But the diagrams often reference the factory bolt sizes and grades, which tell you the clamping load if you know your hardware. For actual torque specs, you need the workshop manual. Keep both on the bench.

What models does this parts catalog cover?

Hino DG550 from model years 1984 through 1997. The model availability chart on page A-3 shows which specific chassis codes (e.g., FD, FE, FG, SG, SF, SE) were produced each year.

Can I use this catalog to identify engine internal parts?

No. This catalog covers chassis, cab, brake, electrical, and driveline components. Engine internal parts like pistons, rings, bearings are not included — you need the Hino engine parts catalog for that.

Are the part numbers still current for ordering?

Some numbers may have been superseded over the years. However, the diagrams give you the original factory number, which any Hino dealer can cross-reference to the current part. It beats walking in with a vague description.

Is this a scan of the original printed catalog?

It is a clean digital scan of the factory-printed catalog. No reprints, no third-party compilation. What you access is what Hino released in the 1990s.

You need the right part number on your order sheet before you touch a wrench. Access the Factory Manual and keep it in your shop — it will save you the trip back to the parts counter.