The washer is not a sealed unit but the rear drum bearing are also you will need a new spider...To take a look inside - Initially you will see enough from the top to see where things are...
1. UNPLUG the washer.
2. check you've unplugged.
3. Open the top of the machine - see the sides of the lid about 10 cm from front, remove plastic caps on each torx head, undo torx. (torx set required)
4. Remove concrete block from top - large spanner is required - remember the sequence so you can replace later.
5. Lean over the drum and see the large drive wheel.
If the Drum bearing has failed it is usually due to over loading or a faulty seal in the drum, water leaks into the inner bearing. This causes corrosion and then ultimately failure.
In the likely event that the bearings have failed (I have had a hotpoint wma33 fail at 23 months...) Its actually cheaper for you to pay hotpoint to fit a new drum (Parts are free for 5 years! you just pay a flat callout fee - believe me its a bargin). + they never ever replacing just bearings, it takes too long for them. They will do a whole drum and spider arrangement in under 2 hours...
I wasted 3 days because these things are really awkward to remove and refit. The callout fee for a hotpoint engineer a fixed cost. I bought a spider see:http://www.4hotpoint.co.uk/cgi-bin/product.pl?PID=954798&brand=&model=wma33&part=spider
This spider costs 61.25 + delivery - ouch.
I bough a half drum thinking I would keep the costs down. Hotpoint will fit half a drum or full drum (Depending on what is on the van for their call out fee) the actual cost of a half drum is 75.99 + delivery see: http://www.4hotpoint.co.uk/cgi-bin/product.pl?PID=639770&brand=&model=wma33&part=drum
and a full drum costs 161.49 + delivery
They take away all the rubbish at the end also!
I know this site is about doing it yourself and I can go into more details about how to do it. But because I did not have the correct tools that hotpoint must have to pull the bearings from the housing etc - I feel I would be wasting your time.
I hope this helps
Please don't rate me as unhelpful, this is not a simple change the bearings task.