Step 04.9 — A idler: pull the aid bolt and slide in the tension arm¶
Step 9 of 38 with a helper · Chapter 04 — A/B drive units and front idlers
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Parts:
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[a]_tensioner_right, insert and M5 nut fitted · already on the bench
Do: Pinch the two frames together, withdraw the M5×40 SHCS downwards, and slide [a]_tensioner_right into the channel until its top boss lines up with the upper frame's hole. Keep pinching; the stack is unsupported.
Check
The arm sits flat in the channel and its top boss is concentric with the frame's top hole. If it fights you, it is [a]_tensioner_left.
Helper Pinches the two idler frames together while you swap the bolt for the arm.
What you're looking at
Manual p.66 and the pair render: the blue [a]_tensioner_right sliding into the channel between the two idler frames. The two arms are mirrors of each other, the same C handed the other way. The wrong hand will not lie flat in the channel.
Source: Voron manual p.66