John Deere had a puller to use to remove them. When you have them out make sure you clean the bores in the head. Deere had a reamer for that. Also get a bore brush and clean the injector openings. They also need to be torqued properly (18-20 foot pounds if I remember right).
I replaced my factory injectors back around 300,000 miles. Left the factory cups in place. Now sitting over 515,000 miles and the factory cups are still doing just fine. Well, that all depends on your level of boredom and length of the Honey-Do List. From your post, you're going in to do the Sticks. Reconnect the battery. Prime the fuel system by turning the ignition key to the “start” position a few times (with several seconds in place). You’ll hear the fuel pump prime the lines. Do this at least 3 times to pressurize the fuel lines. Inspect the engine compartment for fuel leaks at the injector rails.
The injectors clearance tolerances on the port are very small and if you are pulling the injector by hand you run the risk of damaging the head or destroying the injector. Figure 9 With the injector out you can see the Teflon chamber seal (red arrow), the support disk (yellow arrow) and the injector to fuel rail seal (blue arrow).

Parts dept says they replace them 1 or 2 when needed. Now, if they were long in the tooth say at 200K and I had 3 or 4 bad ones, I might just replace the rest of them. 01 Excursion 7.3L Powerstroke. Gauges with AIH Delete, AIS, CCV Mod, 4' MBRP, BTS Trans, 6.0L Trans Cooler and Intercooler, DP-Tuner F5 chip, ITP In Tank Mod and Boost

The average cost for a Diesel Injection Pump Replacement is between $1,743 and $2,382. Labor costs are estimated between $462 and $582 while parts are priced between $1,281 and $1,799. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
Here's an easy way to locate and fix a leaking injector.ENJ Customs on TikTok:
Make sure that this is the problem you are dealing with before you spend on a new fuel injector or have your mechanic change it. You can use an OBD2 scanner paired with a diagnostic tool to confirm your doubts. 5. Fuel Leak. Apart from collision damage, a fuel injector can be cracked or broken due to general wear and tear.
T1aF.
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    • how to change diesel injectors