Description

Yale GP, GTP, GLP, GDP Parts Catalog

If you’ve ever ordered a fuel injector for a Yale GDP and ended up with one that didn’t fit the 4TNE92 block, you know the cost of guessing. This Yale GP, GTP, GLP, GDP Parts Catalog is 172 pages of factory-sourced part numbers and exploded diagrams – the same thing the dealer parts counter uses. I’ve watched guys waste a whole morning cross-referencing aftermarket lists that don’t match. This book kills that headache.

The first two pages lay out how to read it: reference numbers, part numbers, description, quantity, and remarks. Each exploded view ties a circled reference number to a part number. The notation is clear – AR means “as required” for items like seals or gaskets, and an asterisk marks the maximum quantity. You see abbreviations like NSS (Not Supplied Separately) and NA (Not Available). If you’re trying to order a part that says “NA” – don’t bother, it’s not sold alone. That kind of detail saves you one angry phone call to the supplier.

Reading the Parts List: Reference Numbers and Part Numbers

Page 1 of the manual explains the layout. Each illustration has a reference number – like 1-, 2- – that points to a row in the table. The part number column gives the actual OEM number. The remarks column tells you which model it fits (AK, RK/TK, etc.) and any interchangeability notes. If you’re working on a GP/GTP/GLP/GDP15-20AK, the suffix AK matters because the same part may not fit the 20-35RK/TK series. Ignore that and you’re buying the wrong bracket again.

I’ve seen techs skip reading these notes and then complain the parts list is wrong. It’s not wrong – you just didn’t look at the column that says “Applying model.” This catalog also notes right-hand and left-hand orientation relative to the forward motion of the forklift. That matters on steering knuckles and brake assemblies.

Engine Identification: 4TNE92 (2.7L) and 4TNE98 (3.3L)

Two diesel engines are covered in this catalog – the 4TNE92 (2.7L) and the 4TNE98 (3.3L). The abbreviations table on page 2 links engine codes directly to vehicle models. If you’re rebuilding a GDP30, you’ll want to know which engine family you have before ordering a cylinder head. The parts list uses columns to separate gasoline (GP), dual fuel (GTP), LPG (GLP), and diesel (GDP) variants. The same chassis may use different engine mounts, so verify your serial number against the table.

Related manuals like Yale Detailed List of Spare Parts for GP/GTP/GDP/20AK/25/30/35RK/TK cover narrower ranges, but this one spans the full AK and RK/TK line. Yale Detailed of Spare Parts GP/GTP/GLP/GDP/GD might help if you have a GD variant, but for these four fuel types this is your single source.

Exchange of Parts: Why OEM Number Changes Matter

The last section of the manual’s introduction mentions that part numbers are subject to change without notice. If you’ve got a 2010 GP20 and a 2015 GP20, the part number for a steering wheel may have been superseded. The catalog includes exchange notes – old number, new number, and whether the parts are interchangeable. I’ve had customers order a part by the old number, get an NLA reply, and give up. This book tells you the replacement number. Page 2 explicitly warns: “When parts should be replaced and if there is no interchangeability, the number…” – that cut-off is critical. Always check the remarks column for successor part numbers.

Never throw away an older edition of this catalog because the changes accumulate. The parts counter guys at your local Yale dealer may not have access to every historical revision. You do.

Abbreviations Decoded: NSS, NA, AR, and More

The abbreviation list on page 2 is dense. NSS means the part is not sold separately – you have to buy the assembly. NA means not available at all (often obsolete or only sold as a weldment). AR (as required) appears on items like shims or gaskets where the count varies. The asterisk gives the maximum – don’t order more than that. If you see “STD” next to a dimension, that’s standard; oversize parts are usually listed separately. Forks, tires, and hydraulic components also have thickness (T) and length (L) indicators. Missing these details means you might order a standard shim when you need a thick one. I’ve replaced a differential because someone used the wrong shim stack. Don’t be that guy.

For a broader overview of industrial vehicle documentation, see the Automotive Industry Overview for context on how manufacturers structure parts catalogs. The Automotive Industry Overview page can also help you understand why OEM catalogs use specific numbering schemes.

Audience Fit: Who Needs This Catalog

If you own a small fleet of Yale GP or GLP forklifts, or you’re a home-garage mechanic rebuilding a 1990s GDP20, this is the only parts book you should touch. It’s not a service manual – there are no torque specs or repair sequences. But without it, you’ll spend hours on the phone holding a part up to the light. Shop owners: put this on the shelf next to the service manual. It pays for itself the first time it stops a wrong order. DIYers: if you’re rebuilding a Yale forklift, you absolutely need the serial number from your data plate and then look it up here. The models covered are GP/GTP/GLP/GDP15,18,20AK and GP/GTP/GLP/GDP20,25,30,35RK/TK.

Another related manual is Yale Detailed of Spare Parts GP/GTP/GLP/GDP Series, which may group parts differently, but this one is the most comprehensive for the AK and RK/TK range.

Source Validity: Factory Print vs. Third-Party Compilations

This is a direct scan of the Yale factory parts catalog – not a re-keyed spreadsheet or a compilation from multiple sources. I’ve seen “aftermarket parts catalogs” that mix parts from different model years and don’t tell you. This manual is the genuine OEM document with the original page numbering, parts illustrations, and part numbers that match the dealer’s computer. You can verify every part number online at Yale parts portal. The 172 pages include all the major assemblies: engine, transmission, hydraulic system, mast, steering, brakes, electrical, and body. Every exploded diagram has the reference numbers that link to the table. No third-party guesses.

Does this catalog include torque specs or service procedures?

No. This is strictly a parts catalog. It lists part numbers, quantities, and illustrations. For torque and service steps, you need the Yale service manual for your model.

Are the part numbers still current for my 2002 GP25?

Part numbers change over time. The catalog includes exchange notes indicating superseded numbers. The manual itself is a snapshot from a certain year, so verify the latest number with a dealer if the part is critical. But the historical numbers are accurate for that build period.

What models does this catalog cover exactly?

GP/GTP/GLP/GDP15,18,20AK and GP/GTP/GLP/GDP20,25,30,35RK/TK. If your truck has a different suffix, you need a different volume.

Can I use this catalog to order parts online by part number?

Yes. Every part number in this manual is a genuine Yale number. Write down the serial number of your truck, look up the part in the correct assembly, and then order using the part number listed. Double-check the remarks column for applicable model and any exchange notes. That’s the correct procedure.

Don’t rely on memory or scribbled notes. Access the Factory Manual and keep it on your tablet or printed out. A parts catalog is only useful when it’s open on the bench while you’re holding the broken piece.