Step 1: Orient the green seal
The green seal and black retainer simply pull off the freehub body.
Orient the green seal as shown.
All of these photos are taken as if you were looking down on the hub while installing. The photos show a Microspline freehub body but instructions are the same for XD and HG
Step 2: Install the freehub body
With green seal and black retainer removed, drop the freehub body onto the hub.
Step 3: Install the green seal
With the green seal oriented correctly it should snap into place with light pressure from your fingers
Step 4: Install the retainer
The black seal retainer will now drop onto the freehub body. Apply light pressure with your fingers and you'll feel it pop over the o-ring and seat correctly
Step 5: Install cassette
You can now install the cassette and continue
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