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Hello, I own an 2015 Ice bear PST150-19N trike.  Not sure is my rear-end is the same.  There are 6 long bolts in my LSD hub that hold on both the sprocket and brake rotor.  Trike broke yesterday 1/4 mile from home and I pushed it.  Decided it was just easier to remove the whole rear-end.  Got to where you are.  I put both washers back on the axle stub and ran the large nut down about 1/2".  I grabbed a large, long punch and a hammer.  I cleaned all the grease out of the ends of the axle tubes.  I placed the punch on the inside of the 2 washers and started delivering firm blows with the hammer.  Slowly the axle started coming out.  About every 3 blows I would rotate the axle housing.  It took about 30 blows per side to remove each axle.  It's the axle roller bearing at the outer mouth of the axle housing tube that is causing the friction.  Once you have removed the axles, the LSD wants to drop out.  No oil or grease will pour out of the axle tubes.  The LSD is packed with a white grease viscous material.  Once the LSD and spider gears are out, you will find both the sprocket and brake rotor are pressed into bearing hubs.  You need to press the hubs apart to replace the rotor and sprocket.  I highly recommend replacing all 6 long bolts that hold the LSD housing together.  Mine all broke.  I will be pressing my hubs apart tomorrow, required for bolt replacement.  Will post pics.