Well I have been doing heavy equipment design for 12 years and I have never run across a design book that is specific to the industry. Most heavy equipment tends to be a composite device like a crane mounted on a truck, or a trencher mounted on a crawler, and so on. You will find yourself with a pretty diverse set of reference material.
The SAE has an Off-Highway engineering magazine you might find worthwhile and while most of their standards and books deal with automobiles and commercial vehicles there are some topics covered that pertain to heavy/construction equipment. You don't mention specifically what type of heavy equipment you are interested in so you'd just have to look through what they have. This one (
has some great sections as long as you realize much of it won't apply to what you're doing.
On a more general note:
Don't discount the elementary engineering problems because they are still some of the best first-order approximations you will find. Heavy equipment has more in common with structural design than you might think as they both are focused on steel, bolts, welds, shear loads and moments for massive structures. The initial sketches for a lot of equipment will like truss bridges and idealized lever systems than you may realize.
My advice:
Get a book on welded structure design like the excellent Blodgett text from Lincoln Electric (
Get Marks' Standard Handbook for Mechanical Engineers because you are going to be faced with many, many things for which there is no "spec" or "code book" and you will need to resort to first principles, creativity and testing. (
Get Machinery's Handbook because it has some of the best condensed information you can get on standard ways things get made and it can point you in the right direction on problems that don't have cookie-cutter solutions. (
Get Fluid Power Circuits and Controls: Fundamentals and Applications. It is an excellent CRC Press title that is going to give you a practical way to approach industrial motion control via hydraulics. Remember heavy equipment is portable and self-contained so hydraulics tend to dominate over Gen-set/electric motor set-ups.
You will also want to pick up a book on Steel design that covers all the nuances of how steel is made, what the various grades mean and what applications they are used for since it will be the primary material you use.
These will get you in the ballpark and never go "out-of-date". The more specific things depend on what type of equipment you are intending to deal with.