The BO weight is 965 lbs. It doesn't give lift capacity but for reference my 1260/1246 combo has a BO weight of 1821 lbs and a full height lift capacity of 1050lbs. Using the same ratio would give you about 550 lbs.
Happened to be rummaging through some stuff and found an old MF loader brochure. It doesn't list your combination but 1220/1242 is listed as 955/565 (BO/lift capacity). The guestimate above was pretty close.