Nicholas Fluhart

July 20, 2009

Allis-Chalmers ACP 80 Lift Truck

The Allis-Chalmers ACP80 is a heavy-duty conventional type forklift. I’ve owned this one, a 1980 model, since 2007 (see the ACP80 project page here) and have been pleased with its performance and dependability. Below are the specs and information I’ve accumulated for the ACP80. I’ve also posted some pros and cons based on my experience with the machine.

1981 Allis-Chalmers ACP80 Forklift

  • Produced by AC’s Industrial Truck Division in Matteson Illinois
  • Model: ACP80
  • Fuel Type: LP
  • Engine: 6-cylinder Continental F245
  • Horsepower: 76
  • Transmission: Borg Warner Oil Clutch w/High and Low Range
  • Approximate Weight as Equipped: 12,322 lbs
  • Attachment: 42″ Forks
  • Load Tires: 8.25-15 14-Ply
  • Steer Tires: 7.50-10 12-Ply
  • Mast: 3-Stage
  • Lift Height: 182″ (Approx 15 feet)
  • Lift Capacity: 8,000 lbs
  • Mast Backtilt: 8 Degrees


-Industrial Truck Division

Allis-Chalmers first entered the material handling industry when it purchased the Buda Company in 1953. Buda was a manufacturer of engines and material handling equipment. I believe the main interest in the acquisition of Buda was so AC could produce their own diesel engines for their crawler tractor line, but it proved to be a two-fold blessing. Until that time, the diesels used in AC crawlers were GM diesels, also called Detroit diesels. The acquisition allowed AC the capability of controlling the manufacturing of their own diesel engines, which was a major plus, but their entrance into the material handling industry was also very profitable. Later, AC lift trucks were produced under the Industrial Truck Division of Allis-Chalmers. AC did well in the material handling industry for a number of years and despite financial hardships faced by many capital equipment manufacturers in the late 70′s/early 80′s, AC managed to hang on to their industrial truck division until 1986 when it was sold to AC Material Handling Corporation, a privately-held company.

-Model

I’ve found it very difficult to obtain information specifically for the ACP80 unit, so this part is basically from my experience and may or may not be completely accurate. To summarize the dissection of the model number, I believe the “AC” in ACP80 refers to Allis-Chalmers, the manufacturer. The “P” appears to refer to the model being pneumatic tire equipped. Some have said it refers to the fuel type, propane. This is likely derived from noting other models, such as the ACE which is electric. However, I have seen many ACP’s that were gasoline and diesel. If anyone has more detailed information, please feel free to post it. The “80″ refers to the lift capacity which is 8,000 lbs. The smaller and more common sibling, the ACP60, is a 6,000 lb lift and the ACP40 is a 4,000 lb lift, and so on. AC also made conventional types even larger with the ACP 100, 120, and 140.

-Fuel Type

LP or LPG (liquid petroleum gas) is my preferred fuel type for lift trucks. It burns clean, which allows engines to last much longer. This also minimizes noxious exhaust gases which serves well in close quarters where forklifts are commonly used. However, I would have to say the main reason I like it is its convenience. The system is sealed and easy to deal with. I don’t always use my forklift regularly, and with the LP system, I don’t have to worry about the carburetor gumming up or the fuel going bad or perhaps accumulating moisture between uses. Another plus.

-Engine

Continental engines are in a wide range of lift truck brands and applications as well as various types of industrial equipment. The Continental L-Head engines are old technology flat-head, points ignition type engines but are typically solid, bullet-proof power units. My ACP80 is equipped with a Continental F245 6-cylinder engine, which I believe produces 76 horsepower.

-Transmission

The Borg Warner oil clutch transmission, another common item in lift trucks, seems to be a solid unit. Borg Warner has long been a producer of industrial clutch and transmission related components. I’ve never had any trouble with mine. The ACP80 is equipped with a 2-speed unit that is handy when driving from point ‘A’ to point ‘B’, just shift it up in high range and it cruises at low RPM. When you get back to business, drop it down in low and it is responsive and powerful. At my place, I never really get into a position to use the high range. Low does pretty much everything I need, but the high range is a nice option to have when it is needed.

-Weight

A lot of weight is required to move heavy objects with stability. The ACP80 is a very weighty machine. I stuck mine the first day I used it. Even on a very hard packed dirt surface you have to be careful if you drive back through your tracks. The weight is concentrated on four narrow tires and you can literally feel the ground moving under you when operating the machine off-road. Even on concrete floors you need to take note of the slab depth; this thing will break concrete. Some models came with dual wheels on the load axle which would serve well off-road. My machine was intended to be used in tighter quarters and has the single drive wheels for better maneuverability.

- Attachment

The forks on this machine are heavy, 5 inches wide and 2 inches thick. The factory equipped forks are approximately 3.5 feet in length. The forks on my machine appear to be closer to 4 feet. Overall, they are adequate for this unit. In fact it could easily handle longer forks. I recently installed fork extenders on mine, making the length 5 feet.

- Tires

The data plate shows the factory equipped tires to be 12 ply. The load tires (drive tires) on my machine are 14 ply wide-walls. The wide wall design is to protect the wheel rims. Forklifts are often operated in tight areas and the rims can get scraped and bent. This is especially true on machines like mine that utilize Dayton wheels. The lugs tend to extend out a little bit further than rims with center lugs.

- Mast

A strong 3-stage mast is a great asset on any forklift. My ACP80 has a very heavily built but relatively short mast. The shortness makes it ideal for operating in a shop or warehouse where the unit may travel through doorways or under low ceilings, but to make up for the short height it has three stages. The overall lift height is about 15 feet. The lift capacity is 8,000 lbs, so it will handle quite a load. The mast tilts forward and backward but does not have side-shift, which wasn’t really common until later.

Unloading Two Paper Rolls Weighing 900 lbs Each

Transporting 900 lbs Paper Roll

- Pros

This is one of the most dependable machines I’ve owned. The great thing about the LP gas is it can set up for long periods of time and still fire right up when I need to use it, no matter if the weather is hot or cold. Another plus is the pneumatic tires. It can easily negotiate gravel and other hard surfaces in addition to paved surfaces. The ACP80 is actually considered an “all-terrain” forklift, not to be confused with “rough-terrain” forklifts which have much larger tires and are typically not of the conventional lift truck design. The transmission is smooth and the high and low range is nice. The 3-stage mast with tilt adds to the capability in service, especially when the machine can lift 8,000 lbs. Overall, very capable.

- Cons

For a conventional type forklift, it is somewhat large. You have to plan ahead because, compared to smaller units, it takes much more space for maneuvering than you might think. Also, it’s very heavy so you have to be careful where you operate it. If you get it stuck you’ll need something substantial to get it out. The tilting mast is great, but it was built before side-shift was common so you’ll have to be a good driver. One of the main drawbacks of having such a large mast is it severely limits visibility. It’s very difficult to see exactly where your forks are, so you need to have a good feel of the machine because you won’t be able to see everything.

Loading Scrap on 1979 Ford F-600 4x4

You’ll probably be seeing this forklift in the background of many other posts. At some point I’ll post some videos of it in action.

You may also be interested in the ACP80 project post here.

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14 Comments »

  1. I have a ACP 80 and the low side of the trans only grind’s when I try to shift it in , would you have any ideas where I might find a trans. or parts if I get the nerve to tear it down . I sure would be greatful for any help . Thanks Dennis

    Comment by Dennis Bays — March 13, 2011 @ 12:09 pm | Reply

    • Dennis,

      That’s not good…low range is used the most. If you haven’t already, check the shift linkage. I had a minor issue with the linkage on mine, but there was no grinding involved. Fortunately, I haven’t had to search for transmission parts, but for rebuild kits and such, you can do a google search and come up with a lot of parts suppliers. You may also find a complete used trans from a forklift repair shop in your area. There were recently some complete new old stock transmissions on eBay for $1500 OBO. If you build up the motivation to tackle the project, these are good machines.

      -Nicholas

      Comment by nfluhart — April 5, 2011 @ 9:55 am | Reply

  2. I HAVE ACP 100 MODEL . LP POWERED , NISSAN IN LINE 6 MOTOR , POWER SHIFT , DUAL TIRES

    WHERE CAN I GET INFORMATION ON THIS LIFT ? YR. SN # , SPECS ETC .

    ANY INFO YOU MAY HAVE OR IF YOU CAN DIRECT ME TO INFO WOULD BE GREATLY APPRECIATED .

    THANKS

    RW

    Comment by RW ONEAL — December 28, 2011 @ 11:11 pm | Reply

    • The ACP 100 is rated to lift 10,000 lbs. The serial number should be located on a tag on the front of the steering column, or at least that’s where most of them are located for the ACP models. There you should find load and tire capacities as well as other specs. Once you obtain the serial number you can contact the former ‘Kalmar AC’ distributor (Kalmar ended up with the AC Industrial Truck distribution before it was eventually changed again to something else). Their website is gone, but I believe the company is still operating in Covington, GA under a different brand name. Their phone number is 800 311 8452. If they are still around, they can supply year model, information, manuals, parts, etc. Otherwise, you’ll have to rely on a local forklift service company or Google for manuals, etc. I’ve also found knowledgeable people on various internet forums, such as AllisChalmers.com and others. Good luck with your machine!

      Comment by nfluhart — December 29, 2011 @ 2:35 pm | Reply

  3. i have a ACP 70 D with a borg warner T 11 in it. the forklift would not move in reverse. i removed the transmission and started looking at parts and air tested port holes and passages. my front clutch pack engages with ease but my reverse does not. got to looking at the reverse piston and it has to holes in it that look machined. is there suppose to be a ball or something blocking these passages so the oil would not escape or what could my problem be? thanks

    Comment by Brian — February 18, 2012 @ 9:53 pm | Reply

    • I couldn’t say for sure on whether it requires a ball to block the passage. Assuming the shift linkage was operating correctly (I had a linkage issue with mine, but mine is an oil clutch manual transmission) you may want to check the fluid you drained to see if something is in it. Otherwise, the best recommendation I could give would be to find a diagram of the components. I’ve located a relatively simple diagram of the valve body here: http://www.joseph.com/PDF/Trans_DL.pdf However, I have been unsuccessful in locating any other T11 diagrams online, so you may want to look into getting a parts or service manual, both will have diagrams. I reviewed my manuals, but unfortunately they do not cover the T11 or any of the automatics.

      Comment by nfluhart — February 24, 2012 @ 1:21 pm | Reply

  4. inserted a 7/32″ ball in one of the holes in the piston according to a parts diagram that i found and it fixed my problem thanks again

    Comment by Brian — March 1, 2012 @ 7:56 pm | Reply

    • Cool…glad you got it figured out.

      Comment by nfluhart — March 12, 2012 @ 12:53 pm | Reply

  5. I have a acp80l pssngl serial#adp 100431 can you tell me what is the recamended trans fluid also the year thanksjim

    Comment by jim — November 26, 2012 @ 7:44 pm | Reply

    • Unfortunately, I don’t have a serial number index, but if the numbering system is the same as mine I’d say you have a much newer model. I posted an inquiry in the Allis-Chalmers forum at Yesterday’s Tractor and found someone who gave me some serial number info; you might try over there: http://ytforums.ytmag.com/ If it has a Borg Warner oil clutch transmission with high and low range, it likely takes automatic transmission fluid, as does mine.

      Comment by nfluhart — January 12, 2013 @ 6:44 pm | Reply

  6. My ACP 60 mast stops at the first stage, is there a trick?

    Comment by Barney Auman — March 12, 2013 @ 7:08 am | Reply

    • I assume you mean it stops at first mast as you are raising it? (Mine would stop as it lowered…see the post on hydraulic repairs part 1). No trick that I’m aware of. Inspect the mast as you raise it. If it’s a mechanical bind in the mast linkage, you should hear/feel the hydraulics and/or engine bog down as it encounters the problem. If it’s a hydraulic problem it could be the second stage cylinder or something causing the fluid to essentially bypass the cylinder back to the reservoir, in which case it probably wouldn’t bog the engine.

      Comment by nfluhart — March 12, 2013 @ 3:37 pm | Reply

      • This is going to seam like a no brainer but two of the mask section have been disconnected. The mask leaked so they by passed it. I have no idea how the hoses are supposed to go. There is a fitting at the top and bottom of the rear mask cylinder but no hose. Thanks for your quick response.

        Comment by Barney Auman — March 12, 2013 @ 4:05 pm

      • I think I can clarify…The fitting at the bottom of the rear cylinder goes to the hydraulic valve. The fitting at the top of the rear cylinder goes to the bottom of the short cylinder. It’s just a hard line that links the two cylinders; it does not require a hose reel. View the photos from my hydraulic repair posts on my ACP 80. Hope this helps.

        Comment by nfluhart — March 23, 2013 @ 7:36 pm


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