I had this in recently for a dead brushroll, and before I even got round to that, I noticed that the motor sounded a bit peaky...
Quick message to the owner and he agreed to a new motor, and once I got the brushroll diagnosed, a new brushroll motor too. The parts arrived last week, and I got to it. Realising there is no how to guide for the main motor (apart from one buried in another thread), I thought I would give it a try!
New DC24 Motor assembly - https://manchestervacs.co.uk/Dyson/DC24-motor-917281-02-YV-07K24
New Post motor Filter - https://manchestervacs.co.uk/Dyson/DC24-Post-Motor-HEPA-Filter
T-25 Torx driver
So, wand, hose and cyclone off and out of the way.
Recline the machine.
Undo these three screws
You want to unplug this connector block
Next, you need to remove this thin white wire from the plug
because, as you can see, it needs to plug into the block on the new motor
Using a tiny screwdriver/pin/SWMBO's tweezers, push the locking tab up, and the connector pulls out
Then, remove the screw as shown.
Over to the other side, and remove the lower hose
Then remove this screw that sits under the hose
Remove the filter cover, and the filter
Rotate the ball so you can see the 4 screws, and remove them. Lift off one side of the ball, then rotate the other side and lift off the other. Pulling gently on one side, pull until the motor assembly pops out of the locating holes in the chassis
The Yolk comes off easily now
You need to salvage these three bits off the motor housing. If your tiny cog is ruined, you need one of these - https://manchestervacs.co.uk/Dyson/DC24-Bearing-Ball-923685-01
Take the larger cog. If it sounds a bit dry when rotating, pop it apart and smear grease over the ball-race. Then, fit it to the motor housing, so the locating lugs align with the motor housing cutouts, and the large lug protects the cables
Clean up and refit the seal
Fit the other bearing onto the spindle on the other side, then slide the housing back into the yolk
Then slide the yolk and motor housing back onto the chassis, the small cog side fits into the chassis, and the 3 screw holes on the wiring side must line up
Refit both screws onto either side of the motor housing. Then, plug the small wire into the new connector block
and plug the connectors together, and tuck the cables into their respective places
Refit the ball by placing one side over the bearings, rotating it to the back and placing the other side on top. Screw up and check for smooth operation
Fit your shiny new filter to give the new motor a great start in life
Refit the cable cover
Refit the side hose, (and the cleaner head if you removed it) and check the recline operation for smoothness. Hopefully, you should be job jobbed!
Intregued as to the state of the old motor, I whipped it out of the housing and popped the fancase off
If it didnt spark visibly through the housing with the filter removed I migth have been tempted to clean it up and save it, but it was too far gone sadly, killed by paper...
Hope this helps anyone out there attempt this quite easy job!