Singer 491D, Service Manual

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9. Check the adjustment and timing of parts disturbed and correct where
necessary, according to the instructions on pages 2 through 7.
10. Replace thread take-up, as instructed on pages 15 and 16.
ll. Replace presser bar and presser foot, as instructed on page 14.
12. Replace the upper needle bar bushing and the needle bar, as instructed on
page 13.
13. Replace thread take-up oil guard P2, Fig. 23, page 16.
14. Replace arm side shield and wick, as instructed, on page 16.
15. Replace arm top cover and tighten its four screws.
16. Replace face plate and tighten its three screws, as instructed on page 2.