Caterpillar — 1. Remove nut (5) and washer (3) from crankshaft pulley (2) .

A Caterpillar service procedure — check it applies to your exact model before use.

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Procedure

1. 2. Use Tooling (A) in order to remove crankshaft pulley (2) from crankshaft (4) .
2. 3. Remove woodruff key (1) from crankshaft (4) .
3. Installation Procedure
4. Illustration 3
5. g00827213
6. 1. Install woodruff key (1) to crankshaft (4) .
7. 2. Put crankshaft pulley (2) in position on crankshaft (4) .
8. 3. Position washer (3) on crankshaft (4) .
9. 4. Lubricate nut (5) with clean engine oil and install the nut.
10. For 3011C Engines, tighten nut (5) to a torque of 123 N·m (91 lb ft).
11. For 3013C Engines and 3024C Engines, tighten nut (5) to a torque of 304 N·m (224 lb ft).
12. 5. Put the V-belt in position on the engine.
13. 6. Slide the alternator away from the engine and tighten the bolts for the alternator. Refer to
14. Testing and Adjusting, "Belt Ten
15. sion Chart" for more information on the proper belt
16. tension.

Source: manual:216-Skid-Steer-Loader-Service-Manual-4NZ03400.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.