This is the aftermarket top carrier roller for the following mini excavators:
This is the smaller roller at the top of the undercarriage in the center to support the weight of the rubber track from sagging down into your track frame.
The blue arrow on the image references where this roller is installed on your Volvo. There should be one top roller per side on your EC 55. There is no additional hardware required for installation, simply unscrew the old roller and insert the new roller and tighten.
This carrier roller (1181-00440) is known to fit:
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