It may well be that you will have to remove the legs to unscrew the casters. You will need a scissors jack, boards, several sizes of wooden blocks and a solid piano bench. Set the bench under the keybed with protective blocks and raise the center high enough to put books or blocks at the ends of the bench to support the piano with both front legs off the ground. Remove one leg to remove casters or try to pop them off as usual. Once the casters are off assemble and adjust the truck and place under the front legs then place blocks under the trucks ends so when the weight is on the truck the back end will not raise up. Lower piano. Make arrange the same but under the rim to raise the back leg. Do the same at the back as you did in the front. When piano is fully on truck remove the clocking under the front truck arms. Done. Newton
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