Lifting capacity of Michigan 75

I guess this question is a bit like "How long is a piece of string" but can someone give me an idea of the weight the machine in the photo is likely to be able to lift. I have a guy interested in buying it and he has asked the question. I remember my deceased cobber saying how happy he was with the machine so I guess it did what he bought for, i.e. loading & unloading logs and moving bulk logs around in the yard. Cheers