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I have 42ST's; the picture looks almost the same for mine. The way you remove the gears is to first remove the spindles. If you can't get the spindles out you will need to tap on them with hammer and a flat blade screwdriver. Once they move upward you will be able to pull them out easily. I wish they had used a shoulder bolt here. The gears should then slide out laterally from the side.
Be sure you also fully disassemble the self tailing head off of the winch drum and grease the slip ring and all of the mating surfaces of the aluminum to the drum, the aluminum to aluminum surfaces on the jaws, and the bolt threads and heads for the bolts. Everything should be well packed with grease in there so that salt water can't intrude and cause galvanic corrosion. I have one winch with an upper jaw that looks like swiss cheese. Luckily it is still OK on the mating surfaces and the sliding surfaces.
If you look at that photo again; the spindle on the left in the photo has the larger gear on the bottom; smaller gear on top. The spindle on the right has the larger gear on top, smaller on bottom. You should be able to estimate the width of the spacer by wear marks on the spindle if they are still visible; otherwise, measure the length of the outer race on the drum and then subtract the height of the two stacked bearings. This should get you close; maybe subtract .050 or .1 inch for clearance at the top. Then get a plastic tube of suitable size to cut for a replacement spacer.
Use Lewmar Gear Grease. You can buy it in the ~5 oz tub, it's cheaper that way; but it's still super expensive. Don't know if you can find Calcium Sulphonate grease elsewhere cheaper, but I will be looking for a different source next time I need to buy it.
Last edited by KeelHaulin; 04-12-2011 at 12:18 AM.