Finding and Using the Allis Chalmers ACC40 Parts Manual
The ACC40 is an Allis Chalmers counterbalance forklift from the late 1970s through mid-1980s, usually powered by the D17 Diesel or occasionally a gasoline V6. When you are trying to rebuild or restore one, the parts manual is the first thing you need because serial number range matters more than you might expect. Allis Chalmers changed suppliers and part numbers midway through production, so a manual that covers the entire run will often list conflicting numbers for the same component. I spent three weeks tracking down a correct governor kit for a D17 on a 1981 ACC40 before realizing the manual I was using lumped two different injection pump versions into one section. The early units used a Bosch PE pump and the later ones switched to a PE-R with different fuel lines and a revised speed control bracket. Once I matched my serial number to the correct sub-section, the part numbers aligned and I saved myself from ordering the wrong kit twice.
Allis Chalmers Forklift Parts Manual Acc40 where to get it
Original paper manuals from Allis Chalmers are effectively unavailable through dealers since the brand has changed hands multiple times. Terex acquired Allis Chalmers material handling, and Caterpillar absorbed Terex's construction and material handling divisions at various points, which fractured the paperwork trail. You have a few realistic options: aftermarket reproductions exist from publishers like Jensen Parts and Haynes, though these are often scanned and recompiled rather than sourced from original factory binders. The detail and cross-reference accuracy vary significantly between printings. Some pages are clear and some are blurry scans pasted together without verification. I have seen reproductions where a single part number was listed under two different assembly diagrams with no note about the serial number cutoff. digitized versions surface on forums and auction sites periodically. These are usually PDFs uploaded by individuals who have photocopied their own manuals. They are functional but again, you should verify critical numbers against a second source if you can. For the ACC40 specifically, look for manuals that reference the D17 engine section because the forklift body and the engine bay share part numbers across multiple models in the same publication.
salvage yards and specialized used equipment dealers sometimes sell original manuals bundled with machines. This is the most reliable path if you can find a seller who knows what they have. Ask to see the table of contents before buying. A complete manual will have sections for the transmission, final drive, hydraulic pump, steering cylinder, mast assemblies, and the engine. If it is missing the transmission or hydraulics, you are better off spending extra to get the full version. there is a practical workaround if you cannot locate a clean manual. Photograph every visible part number tag on your machine, then work backward from the serial plate. The serial plate on an ACC40 is typically mounted on the left side of the frame near the steering column. The format is usually a two-letter prefix, a six-digit number, and sometimes a model suffix. Those first few digits after the prefix often indicate the production month and year, which lets you narrow down which manual revision applies to your unit.
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Reading the manual correctly
Parts manuals are organized by sub-assembly, not by function. If you need a seal for the lift cylinder, you will not find it listed under "hydraulic repairs." You will find it inside the lift cylinder exploded view, which may be numbered differently depending on which version of the manual you are using. This is one of the reasons cross-referencing between copies is valuable. Different printings sometimes reorganize the same content, and having two copies side by side cuts the guesswork roughly in half. another thing that trips people up is the use of generic reference numbers. Many Allis Chalmers manuals use a single reference number for a fastener across multiple assemblies, assuming the mechanic will identify the correct size from the diagram. A M10 x 1.5 bolt might appear in the transmission mount, the engine mount, and the PTO housing with the same reference letter. The manual does not always spell out the thread pitch or length for standard hardware, so you need a quick reference guide for SAE and metric fasteners to avoid taking a guess on something that holds up the engine. I ran into this exact issue when rebuilding the steering gearbox on an ACC40. The manual showed three bolts securing the housing cap with the same reference, but the diameters were different. I measured the old bolts before removing them and found that two were 3/8-inch and one was 7/16-inch, even though the diagram made them look identical. The manual did not call that out. It cost me about two hours of fumbling at the hardware store.
Common pitfalls to avoid
do not assume that a part number in the manual is still current. Allis Chalmers issued numerous supersession notices over the life of the ACC40. A part listed as obsolete in later printings may have been replaced by an improved version with a different material specification. For example, the original pump shaft seals on certain D17-equipped ACC40s were replaced with a higher-temperature compound version due to premature failure in high-cycle applications. The new part number appears only in later revisions of the manual. If you are ordering from a supplier who only has access to an older catalog, they may give you the superseded number that is still listed as available, which could lead to a shorter service life. another issue is the difference between the forklift-specific manual and the engine-only manual. The D17 engine was used in other Allis Chalmers equipment, and the engine parts manual will not include transmission or hydraulic components that are specific to the ACC40 chassis. Some buyers purchase the engine manual thinking it covers everything and then realize too late that the lift valve and tilt circuit are missing. Make sure the manual you are looking at is labeled for the forklift model, not just the engine family. the manual is also limited in scope when it comes to wear allowances. It will tell you what parts exist and how they fit together, but it rarely lists clearance specifications or torque values for every fastener. Those are usually in a separate service manual. If you are only using the parts manual during a rebuild, you are going to be estimating torques and clearances, which is risky on something that carries heavy loads at height. I always pair the parts manual with whatever service or operator manual I can find for the same serial range.
A practical approach to using the manual
strip the component you are working on completely before opening the manual. Lay out the parts in order from left to right as they appear on the exploded diagram. This gives you a physical map of what you are dealing with. Then open the manual to the relevant section and match each physical part to its drawing. You will spot discrepancies immediately if the parts you removed do not match the drawings, which usually means your machine is a later or earlier revision than the manual assumes. if you are doing a full engine rebuild on the D17, expect to spend about forty-five minutes to an hour just verifying that your manual covers your specific serial block. That time investment prevents ordering the wrong water pump gasket or the incorrect injector nozzle holder. I have seen people waste over a hundred dollars on parts that did not fit because they skipped that verification step. The manual is only as good as the section that applies to your machine. keep a notebook of the part numbers you actually use. Over time you will build a reliable reference that is faster than flipping through any manual. When you replace the same worn part on the same model for the third time, you already know the correct number and whether it has been superseded. This is especially useful for the ACC40 because production ran long enough that multiple revision clusters exist, and having your own records gets you past the inconsistencies in the printed documentation.
