I'm guessing you mean seized, not frozen as in ice from cold temperatures. You are using an Americanisms again.
On your 10145, the injector pump is oiled by the engine. You don't have an
oil level in it to check. I sell new
Zetor parts, but as far as injector pump, I would bring them to a diesel fitter shop to get a trained professional to look at them. I have some old pump here that are scrapped. That's the pipe in red I drew is feeding your pump oil from the engine.
View attachment 2792