Do you have to remove power steering pump head on a 1989 4.3 S-10?

No, you generally do *not* have to remove the power steering pump head on a 1989 4.3L S-10 to perform most common repairs. The pump itself might need to be removed for some repairs (like a complete pump rebuild or replacement), but the head is usually left intact.

The head is the part containing the pulley and reservoir. You might need to loosen the pump itself from its mounting bracket for access to other components (like the timing chain or serpentine belt). But if you're just replacing a belt or working on something unrelated to the pump itself, leaving the head in place is typical.