Here is a chart to tell how much weight you will add when you fill your tires with fluid:
http://www.tractorsmart.com/Farm_Tra...re_Ballast.htm
Adding fluid to a 6-12 tire will add 37 pounds to each tire by looking at the chart. Different fluids will have different weight per gallion. An International Havester wheel weight weighs 25 pounds. You can add several weights to your Cub....they will stick out past the rim......could be a clearance issue. You will pay big $$$$ for a set of IH weights.
I pulled a 10 inch Brinly plow with my 70 last weekend. The 70's rear tires do not have weights or fluid in the tires. The rear tires were spinning in 2nd gear...they didn't spin in 1st gear. The tractor's hitch/plow needed some fine tuning done to both. Maybe the 70 could plowed in 2nd gear without spinning the tires if I did the fine tuning.The soil was on the dry side which didn't help. I do have an 8 inch plow that I want to use on my 70. The 8 inch plow wasn't ready to use....ran out of time.
jfinney:
How wide is your plow?
Does the moldboard have a shine on it?
Are you using a coulter?
How wide are your tires?
gcbailey:
You will get some slippage with field/country Firestone tires. They are a turf tire if my memory is right.