The tractor is physically about the same size and lift specs and weight as my l3400, only less power. It should be able to lift and otherwise handle a 6' cutter fine provided you have a FEL or some other weight up front to offset the weight of the cutter.
As to power, you can always bog a machine down. You can have a 5' cutter behind 60hp and bog it at times.
You ain't out of power though until you are bogging it down in your slowest gear.
I have 29 pto HP and a 6' mower. Never touched 1st or 2nd gear. And only in the thickest of conditions do I need 3rd or 4th. Most of my mowing is done in 5 or 6. (4-5.5 mph)