Baelee: You really have to look to notice the horse shoe device. It's actually two horse shoes, one on inside of wheel and one on outside, with two 3/4 bolts going through one then through the wheel alongside the wedges and thread into the second horse shoe on the other side of wheel. The horse shoes must be tight on the wheel, before you start. What happens as you loosen the wedge bolt, one wedge or the other will break loose. The one that breaks loose will come out against the horse shoe, thus forcing the second wedge to break loose.
I have a funny story about those wedges. When I took delivery of my new 1066, the wheels were set on 72" centers, same as my 300, 560 and 656. After working the tractor for a month, I decided I wanted them at 84" centers. Jacked the right wheel, proceeded to loosen the wedge, snap the first one came loose. Try as we would, we couldn't figure how that second one would come loose. Next a phone call to the IH dealer, and he said, "if all else fails consult the manual, the tool you need is on the left wheel". We let the jack down and went to the left wheel, 5 min. we has the wedges loose and wheel moved. It was all in the operator's manual of a 1066, and I can assure you, if all else fails, consult the manual. We missed the horse shoe tool just that easy, probably just as well, had we not read the manual, we would not have known about the 500ft-lbs.
You expressed not seeing that in your manual, it may not be there. My understanding is, wedge lock wheels were optional on 56 series tractors, and not yet available when first 56 tractors came out. My understanding is they were standard on all 66 and 86 over 100 hp. I know they are on all 856, 1256 and 1456 I've seen. I have seen the ocasional 966 without wedge locks. I'm not sure which is correct. My suspecion is they were standard on all tractors over 100 hp after 1967 and optional on 856, 966 and 986.
When your finished, make sure you tighten to 500 ft-lbs. Those wheels have been known to break if not tight. And make sure wedges, axle and wheel are clean as you torque them.
Any questions as you proceed, I'm not far away, too cold for someone my age to go far. I will say this, a year later I moved my 1066 wheels back to 66" centers, installed duals, and never moved them again. I thought at the time, these damn wedge locks will be trouble once they get 25 years on them. I don't envy you.
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