http://www.nathancallahan.com/leftbank.html
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Moe is 4 feet tall and 150 pounds. But don’t let his Napoleonic stature fool you. Like his fellow chimps, he is strong and aggressive with an upper body strength that could put all of my friends — and some of my enemies — to shame.
Chimps aren’t likely to tell you how much they can bench press, but in tests at the Bronx Zoo in 1924 a male chimpanzee using a dynamometer recorded a one-handed pull of 847 pounds. By comparison, a 165-pound zoo employee pulled 210. In dead lifts, chimps have been known to nonchalantly pump 600 pounds. In the wild, they routinely kill and gulp down much larger animals.
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Seems like their biceps/upper lat strength is more greatly emphasized than lower back strength (considering that they dwell in trees, it's easy to see why). I imagine that a chimp's bench press would be stronger than ours, but not as impressive as their "chin up" ability.