Nothing special about it except that repair info is not always easy to find. No more complicated then some carburetors. Ever have to fix a GM Quadrajet??
No special equipment is needed as long as you have the tractor on-site. Test stands for these pumps are only needed when all you have it the pump, and no engine or tractor to run it on.
Stanadyne injection pump is basically just a high-pressure piston pump coupled to a low pressure rotary vane pump, with some controls added. That along with a distributor that sends the fuel charge to one cylinder at a time.
On a few applications (depending on tractor make) one special wrench is needed that cost around $8. Other then that, no special tools or measuring devices needed. Just about all Deere and Allis Chalmer's spec pumps need the wrench. Also some Oliver, Case and Ford aps.
Keep in mind that these pumps rarely get "rebuilt." I think that word is mis-used. The pumps get resealed, patched up, calibration checked, and most major parts used over again - as is. They are NOT renewed in anyway.
I suspect that most negative comments you're going to hear about working on these pumps are from people that have never done it.
The "kit" you mention costs around $12. All that provides is all the rubber parts, i.e. o-rings, seals, and governor dampening ring. It allows you to reseal the pump and renew the governor ring. That's all. If you find any other parts worn, they have to be ordered one by one. I.e., there is no such thing as a true "rebuild kit."
Again, the word "rebuild" is misused. When you rebuild an engine, all major moving parts are renewed in some way. Not so with a fuel injection pump. Most so-called "rebuilds" get less then $40 in new parts stuck in.
A typical Stanadne/Roosamaster DB or JDB pump can be repaired while sitting on the tailgate of your pickup truck, out in the woods, if you're careful. I've done many with nothing more then some clean rags, diesel fuel, and compressed air.
No special measuring tools needed either. All fits of parts are checked by appearance and feel - not with any measuring devices.
Main max fuel setting, if you feel needs to be checked, it done with a common 2" micrometer. Timing advance can be adjusted with the pump on a running engine - with a timing light, or a $6 plastic timing window.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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