You have several things here why imo CAT is a great short.
1) My limited but ever improving T/A skills say the chart says so.
2) Fundamentals. P/E is too high compared to S&P.
3)Interest rate hikes hurt this company. (.25 priced in for now)
4)Trump. I can't see any particularly good news on the China front between now and Jan 20th. If China so much as says "boo", CAT falls off a cliff. Very possible considering The Donald's penchant for spouting off. CAT doesn't break out sales by country, but CAT Asia accounts for just over 20% of revenue.
5) The CEO said it was lol.
All that being said, I feel like today the market is a loaded spring, just waiting for the FED's confirmation of what it has priced in. When it hits the wires, unless Yellen's tone is hawkish going forward as a dig at Trump...the markets will spring north. And my short, already ugly here, will get stopped out.