Electorlux S165A Floor Shampooer squeaking wheels

[lux165a]

Hello, I have an Electrolux S165A Floor Shampooer that is really squeaky.

I took it apart thinking it was the belt, and discovered that the 2 non-drive white wheels are loose and they are what squeaks.

My question is, can these be removed and tightened? I don't see how they are attached and don't see a way to remove them or tighten them?

Attached are 2 pictures, 1 of the wheels that I am referring to, and 1 of the label.

Thanks

 

[rugsucker]

"--way to remove--"

Under the plastic motor cover at front over pulleys you will see 2 round metal caps that could be removed to expose clips and washers.But removing them would damage them and require repair or replacement(Elux branches could order these).They rarely needed attention.