Cummins — Alternator - Remove and Install

For these Cummins models: GTA38, GTA38, GTA50, GTA50.

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Procedure

1. 5. Remove the alternator belt.
2. Note: The three cap-screws are SAE Grade 8 and
3. the three spacers are hardened. Keep the parts
4. together to aid in the assembly procedures.
5. 6. Remove the three cap-screws, spacers, washers
6. and nuts from the alternator mounting.
7. 7. Remove the nut and pulley from the alternator.
8. 8. Clean and check the pulley for reuse.
9. 9. Lubricate the shaft with engine oil. Install the pulley
10. and nut on the alternator shaft. Tighten the nut to
11. 100 Nem [75 ft-lb].
12. Engines with the older style alternator adjusting link
13. require that the end with the longest machined area at
14. the cap-screw hole must be nearest to the alternator.
15. Note: The three cap-screws are SAE Grade 8. The
16. heavy flat washers are hardened. The washers have a
17. notch for identification. These parts
18. are installed
19. because they must be loosened and tightened more
20. than normal to adjust the alternator belt.
21. Use your hand to tighten the cap-screws.
22. 1. Install the top cap-screw first. Install the heavy flat
23. washer on the cap-screw. Instail the cap-screw and
24. alternator on the bracket. Install the next heavy flat
25. washer and the flange nut.

Source: manual:Cummins Gas GTA38-50 Manual 1999 (2).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.