WTW4750YQ1 Whirlpool Washer - Overview

First pry off the cap of the agitator. Then using a socket remove the bolt that holds the plastic cup in place. Remove this cup by prying it loose from the two tabs that hold it in place. Once this cup is removed you can get to the broken cogs.
Slip the new cogs into the underside of the cup, and slide the cup back down in the agitator housing using the slots on the side for a guide. (You may want to remove the entire agitator and assemble everything upside down, then flip it all back over to mount, so the cogs don't fall out).
Tighten the bolt, snap the cap back in place on top of the agitator and your'e done. Easy repair.

A detailed Service Technician Service Manual is hidden inside the machine on the front panel. It is hidden by the bleach dispenser input. It gives a list of fault codes and instructions for calibration after repair, resetting fault codes, and a manual test mode for stepping the machine through each mode on command. The Tachometer failed which would not let the machine come up to maximum spin speed. The tachometer is part of the solenoid actuator that shifts the transmission. It is not specifically called out in the manual. Any failure causes the lid lock light to blink which gives the appearance of a lid lock failure

pull off softner dispenser, pop off agitator cap by inserting straight screw driver into small slot, remove bolt inside agitator with socket wrench and long extension, pull agitator straight up off shaft, place agitator on floor, with feet holding bottom half pull top half apart from bottom half by pulling straight up, note direction of old cogs remove and replace with new, reassemble