Hydraulic power steering — pump drive source In a conventional hydraulic power steering system, the power steering pump is driven by a:

Introduction / Context:
Hydraulic power steering uses an engine-driven pump to generate fluid pressure for steering assist. Identifying the correct drive source helps with belt routing, noise diagnosis, and accessory layout understanding.

Given Data / Assumptions:

• Traditional hydraulic assist (not electric power steering).
• Accessory belt system on the front of the engine.
• Pump is mounted with a pulley.

Concept / Approach:
The engine crankshaft pulley drives accessory belts that power the alternator, water pump, air conditioning compressor, and power steering pump. Direct camshaft or driveshaft drives are not used for this accessory, and timing chains are internal and not used to run external pumps.

Step-by-Step Solution:
Locate the crankshaft pulley at the front of the engine.Follow the serpentine or V-belt routing to the power steering pump pulley.Confirm mechanical drive by belt from the crankshaft.

Verification / Alternative check:
Service diagrams and belt replacement procedures show tensioner adjustments for a belt that includes the power steering pump and the crankshaft pulley.

Why Other Options Are Wrong:
A camshaft belt drive would vary with valvetrain layouts and is not used for this pump. A chain from the crankshaft is internal for timing, not for accessories. The driveshaft is part of the drivetrain, far from the engine bay.

Common Pitfalls:
Confusing hydraulic with electric power steering, where an electric motor replaces the belt-driven pump.

Final Answer:
belt from the crankshaft pulley