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Ch 0413 / 38

Step 04.13 — B idler: stand the assembly-aid bolt in the lower frame

Step 13 of 38 · Chapter 04 — A/B drive units and front idlers

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gather Gather for this segment — steps 04.13–04.19 (~35 min)

Motion box

  • F695 bearing ×2

Fasteners, Tools & Misc box

  • M5×40 SHCS ×1
  • M5 precision spacer ×2
  • M3 washer ×1
  • M3×40 SHCS ×1

Printed parts

  • front_idler_left_lower ×1 · bin 04-B
  • front_idler_left_upper ×1 · bin 04-B

Already on the bench

  • [a]_tensioner_left, insert and M5 nut fitted · bin 04-B
  • the same M5×40 SHCS

Parts:

  • front_idler_left_lower ×1 · bin 04-B
  • M5×40 SHCS ×1 · Fasteners, Tools & Misc box

Do: Lay front_idler_left_lower flat with its idler boss up and push the M5×40 SHCS up through it from underneath. The B idler's boss is lower than the A idler's; that is correct.

check Check

Bolt vertical, head home. If the boss looks tall like the last one, you have the A idler's lower frame.

What you're looking at

Manual p.69: the B front-left idler. front_idler_left_lower is the short one at 11.6 mm, so its bearing stack sits lower. That is why the B belt runs in a lower plane than the A belt.

Source: Voron manual p.69

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