The pulley is pressed on and requires a special power steering pump pulley removal tool to get the pulley off the pump shaft:
Fig. Fig. 5: Pump pulley removal and installation-1993-96 vehicles
Fig. Fig. 6: Exploded view of the power steering pump mounting-late-model 4.3L engines (1993-96 shown)
The following procedure requires the use of the GM Puller tool No. J-29785-A (1985-92), Puller J-25034-B (1993-96) or equivalent, and the GM Pulley Installer tool No. J-25033-B or equivalent.
WARNING Be sure to cap all openings in the pump hydraulic system to prevent excessive fluid spillage and the possibility of system contamination.
On early-model vehicles where the drive belt is tensioned by pivoting the power steering pump assembly, do NOT fully tighten the mounting bolts at this time, since you will just have to loosen them again for belt installation and adjustment.
The tool is available from any auto parts store. Autozone and Discount Auto Parts both rent the tool under their tool rental program:
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