Introduction
Use this guide to replace the drive belt on your Whirlpool Duet WED87HED Dryer.
The drive belt is a critical component of your dryer, and the clothes will not tumble at all if it's broken. Clothes will also not tumble properly if it's slipping on its belt.
Tools
Parts
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            Use a 5/16 inch nut driver to remove the two 15.7 mm-long screws securing the top panel to the rear panel bracket. 
 
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            Lift the top panel upward to separate it from the chassis. 
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            Remove the top panel from the machine. 
 
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            Use a 1/4 inch nut driver to remove the two 16.3 mm‑long sheet metal screws located at each end of the control panel. 
 
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            Use a small flat blade screwdriver or a spudger to unlatch both sides of the door switch connector. 
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            Unplug the connector. 
 
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            Use a 1/4 inch nut driver to remove the three upper front panel 16.4 mm-long sheet metal screws. 
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            Tilt the machine backwards and prop it securely, or have a friend hold it. 
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            Use a 1/4 inch nut driver to remove the four sheet metal screws on the bottom edge of the panel: 
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            Two 16.4 mm screws 
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            Two 13 mm screws 
 
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            Use a Phillips driver to remove the two 15.8 mm‑long screws inside the door area below the drum opening. 
 
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            Pull the bottom of the panel away from the chassis about two to three inches. 
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            Lift the front panel off the small tabs on the chassis near the top of the panel and remove it. 
 
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            Use a 5/16 inch hex driver to remove the 16.5 mm-long green ground screw. 
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            Use a Phillips driver to remove the two 15.3 mm‑long cord terminal block screws. 
 
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            Use a 1/4 inch nut driver to remove the eleven rear panel screws. 
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            Ten 20 mm-long screws 
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            One 12.9 mm-long screw under the water inlet. 
 
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            Use a 1/4 inch nut driver to remove the 16.4 mm-length screw holding the main board bracket to the chassis. 
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            Use a 1/4 inch nut driver to remove the two 20 mm-long screws from the top rear of the machine. 
 
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            Lift the panel about 1/2 inch and tilt it to the rear to release it from the vent pipe. 
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            Slide the panel off the vent pipe and remove it. 
 
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            Make sure that the vent pipe is fitted into the collar on the panel. 
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            Make sure the tabs at the bottom are aligned to the bottom rim of the chassis. 
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            Position the panel so its screw holes match with the chassis. 
 
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            Use a 1/4 inch nut driver to remove the 16.4 mm‑long mounting screws securing the lint filter housing. 
 
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            Use a 1/4 inch nut driver to remove the 12.8 mm‑long sheet metal screw that retains the main board to the main board bracket. 
 
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            Lift the rear corner of the main board nearest to the side walls of the chassis. 
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            Slide the main board toward the front of the dryer to release the tabs securing it to the main board bracket. 
 
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            Use a 1/4 inch nut driver to unfasten the 16.4 mm‑long sheet metal screw holding the main board bracket. 
 
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            Lift off the main board bracket from the chassis and turn it so the bottom is exposed. 
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            Using long nose or slip joint pliers, pinch the locking wings of the harness retainer clamp. 
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            Separate the harness from the main board bracket and remove the main board bracket. 
 
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            Use a 1/4 inch nut driver to remove the two screws securing the upper front bulkhead to the front of the chassis. 
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            One 16.4 mm-long sheet metal screw 
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            One 19.8 mm-long sheet metal screw 
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            Use a 1/4 inch nut driver to remove the two 16.5 mm‑long sheet metal screws securing the top plastic portion to the upper front bulkhead. 
 
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            Push the idler arm (the metal upside-down "L") up to relieve the tension on the drive belt. 
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            Remove the belt from the motor pulley. 
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            Gently lower the idler arm until it rests parallel to the dryer floor. 
 
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            Use a 1/4 inch nut driver to remove the four screws securing the lower front bulkhead. 
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            Two 16.1 mm-long sheet metal screws on the left side of the lower front bulkhead. 
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            Two 13.2 mm-long sheet metal screws on the right side of the lower front bulkhead. 
 
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            Lower the bulkhead about 2 inches to free the drum rollers tucked under the drum. 
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            While supporting the drum, remove the lower front bulkhead. 
 
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To reassemble your device, follow these instructions in reverse order.
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