Nikkei Nk Lb65E09 misworking with pictures and videos

Hello.
My first language is not English, please bear with me.
I don’t know if I am going to find the problem here but let me tell you that this forum is awesome anyway. There should be more like it. Here it goes.

I have a Nikkei NK LB65E09.
It has max 4 years (2009 label inside)
It has known long periods of inactivity in a humid environment (80{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d}) and only recently it’s being used regularly.

It is level (I cleaned the floor and adjusted its feet) it does not lean to any side trying to shake it.

The belt is in tension and does not slip off.
Th engine turns with my hand and the brushes are still quite long.

I have studied the symptoms which are:
No suspicious noises apart from the blows (see below).

Centrifuge program with empty basket:
It does the first round almost normally but it seems short and weak.
The washing machine does not walk.
The following rounds, it tries to start (starting noise) and there is a tiny movement of the basket but it stops immediately. And so on till the end.

Centrifuge program with half or full basket:
It does the first round almost normally but it seems short and weak.
The tub inside hits left and right and the washing machine starts walking. The more I fill the basket the worse it gets.
The following rounds, it tries to start (starting noise) and there is a tiny movement of the basket but it stops immediately. And so on till the end.

40° cotton program with empty or full basket:
Water gets in at the start and goes out at the end normally.
Rounds seem normal (2 or 3 rotations) but they seem short and weak.
Unfortunately I don’t know what a normal round is supposed to be (how many rotations)
After draining the water it doesn’t centrifuge.

I add 4 videos to help with the diagnosis.
The first round is at the beginning of each video, the second (which represents all the rounds that follow) is at the end.

Centrifuge program without belt
https://www.youtube.com/watch?v=J5CewEn7r3c

Centrifuge program with belt (towel and t-shirt inside)
https://www.youtube.com/watch?v=w1qMawHoIn0

40° cotton program without belt
https://www.youtube.com/watch?v=fUxLXp9SlEw

40° cotton program with belt (towel and t-shirt inside)
https://www.youtube.com/watch?v=kCdNh0_Ca-w

Pictures of the engine and of its brushes:
Side A http://i.imgur.com/smlIBBr.jpg
Side B http://i.imgur.com/R46sHeF.jpg
Side C http://i.imgur.com/dyNH2gz.jpg
Side D http://i.imgur.com/bnRYUy8.jpg
Brushes http://i.imgur.com/tDaQdYT.jpg

A look inside:
1 http://i.imgur.com/QaXQ9un.jpg
2 http://i.imgur.com/hbmiP1I.jpg
3 http://i.imgur.com/8SBjUVO.jpg
I wonder if the black mèches are normal.