To get the most accurate response, you are probably gonna need to provide more information.
And even then, I dislike charging by the hour and prefer to charge "by the job". Imagine this: Customer calls you up and wants to hire you. You look at the job to see if you can handle the work, and the customers asks "what do you charge". You reply "$XX" per hour. Customer pauses a few seconds....then asks "well how long do you think it will take".......At this point, if you choose to respond with an estimated time, you for darn sure better not go over.....or the customer is gonna likely be upset and not hire you again. And if you dont respond......how does the customer have any idea weather they are looking at an hours worth of work, or 10 hours worth of work..........
And when you charge hourly........you will have a customer want to be watching you like a hawk. Maybe thinking you are going too slow, or taking too long of a break on purpose just to run the bill up....
So, if you still insist on charging by the hour, by all means go for it. But whats your background? How skilled of an operator are you? Just got your first tractor last year? or been on them all your life? And CUT covers a pretty broad range from 2000lb 25HP machines to ~50HP 6000lb machines. Obviously there is a big difference in what they can do and operating costs.
Do you have business insurance and doing this legit? Or are you an under-the-table operation? How are you going to calculate transporting the equipment/milage to/from job?
There is a lot involved. When I am doing work for hire, I see what needs done, then bid the job. Just a total price of XX for me to do job YY. End of story. When the job is done, if job YY was completed to customers satisfaction, there is no issue handing over $XX. When I bid a job, for my 34HP tractor, my target is $50-$60/hr. But also have minimums and factor in drive time.
Assuming you are talking about your SC221 and you are a decent operator.....maybe $40/hr. But that could be too high or too low. Just depends on what the competition in your area is, and what the market will bear, and just what types of work you are versed at doing.