I've always wondered why most household appliances recycling factories don't sell the parts, but hey, I'm just a lowly employee, not a CEO getting paid five+ figures a year.
When I looked into it, the most cited reasons were "that's not our business" (really? then what is?) and "it costs more than it's worth" (it doesn't, plus you get government subsidies for green initiatives).
No mention of contracts forbidding that, some manufacturers do forbid resale of whole units, but not of spare parts.
Caterpillar sold/licensed their brand for use in industries they're not competing in, btw, just like many other big companies.