If you drive slowly down the road, take a corner and notice your steering wheels seems stiff your power steering pump may be going. Most power steering systems work by using a hydraulic system to steer the vehicle's wheels. The hydraulic pressure typically comes from a gerotor or rotary vane pump driven by the vehicle's engine. A double-acting hydraulic cylinder applies a force to the steering gear, which in turn steers the wheels.
Remember - Always place a safety stand under the raised part of the vehicle.
If necessary, install the pulley from the old pump on the new pump.
Install any new hoses on the vehicle now, before installing the new pump.
Place the new pump in the proper position.
If possible, attach feed and return hoses to the pump before bolting it in place.
Install pump mounting bolts and torque to proper specifications. On V-belt models, don't torque the bolts yet. Attach and/or tighten feed and return hoses to pump.
Double check all connections in the fluid system for leaks.
Install any belts that were removed, and adjust belt tension if necessary.
Reinstall any other parts that were removed (brackets, shields, exhaust, etc.).
Double check your hoses. Some have a connection that's hidden in the engine bay, and you can end up removing more than you need to.
Fill the system with new power steering fluid.
Make sure you have the right fluid for your vehicle.
Check for leaks. If you don't see any, put the lid on the reservoir.
Connect the negative battery cable.
Start engine, and look for leaks again.
You need to "bleed" the system to get the air out.
NOTE - How bleeding is done changes from vehicle to vehicle. The following instructions are a general way of bleeding the steering hydraulic system.