That's wrong,
nos.
Meks tools can only repair immobilized and weapon destroyed results, that's why many super-heavy ork vehicles instantly immobilize themselves on any drive damaged result, so the meks can fix them up again.
A stompa, for example, would have to suffer enough drive damaged results to be immobilized before a mek can fix it.
Even orks know it's not smart to start working on a moving machine, and they ain't going to stop unless the have to