http://chevroletforum.com/how-tos is the leading Chevy Silverado resource for technical guides. The power steering pump in your truck runs off the engine and serves as a hydraulic assist for the steering rack. For the full step-by-step article, please visit http://chevroletforum.com/how-tos/a/chevrolet-silverado-1999-2006-how-to-replace-power-steering-pump-392511
Although power steering pumps are prone to wear and may eventually fail, they are not very complex components and moderately easy to replace. In trucks, however, heavier loads can put added pressure on the pump, and failure is usually quickened by the fluid as well as pump overheating. Signs that your power steering pump is failing are: if the steering wheel is shaking heavily, the wheel is difficult to turn, and you hear a squealing or whining noise. If you notice these signs in your Silverado, follow the steps in this video to replace your power steering pump.
Replacing the power steering pump on your Silverado will take two to four hours and is moderately difficult to do. The cost to do-it-yourself at over eighty dollars is a huge saving over what a pro would charge you.
The supplies you’ll need are: a Pulley removal tool, channel locks, socket set, flat head screwdriver, 10 millimeter wrench, pliers, socket extension, and a ratchet.
Step 1 – Remove the Radiator Fan
Disconnect the battery.
Unscrew the clamps on the air intake hose.
Then remove the air intake assembly.
Remove the radiator fan shroud by first taking out the 10 millimeter bolts on the fan shroud.
Remove the radiator fan by applying the large monkey wrench to the nut on the back of the fan. Rotate the blades of the fan counterclockwise to remove it.
Remove the lower radiator shroud.
Step 2 – Disconnect the Power Steering Lines
Remove the serpentine belt by attaching a 15 millimeter socket with ratchet and extension to the center bolt of the pulley. Turn the bolt until enough slack is present to remove the belt.
Unbolt the front splash guard from underneath the truck with a 10 millimeter socket.
Then remove the lower guard behind that by taking out the four bolts.
Place the catch pan directly underneath the power steering pump. Use an adjustable wrench to loosen the nut on the supply line, and let the fluid drain into the pan.
Use the pliers to squeeze the tabs of the hose spring clamps on the soft return line. Pull the hose away with the pliers.
Let the fluid drain out into the catch pan.
Step 3 – Remove Power Steering Pump
Place the pulley removal tool onto the center bolt of the pulley.
Attach a 10 millimeter wrench to the nut of the pulley tool.
Hold the ratchet in place as you rotate the wrench counterclockwise until the pulley is removed.
Remove the four 15 millimeter bolts securing the pump to the bracket and the bracket to the engine.
While supporting the pump, use a socket and ratchet to remove the three bracket bolts.
Slide the pump out.
Use a socket as well as a ratchet to remove the two 8 millimeter nuts securing the old power steering pump to the black bracket.
Step 4 – Install New Power Steering Pump
Transfer the mounting bracket to the new unit.
Slide in the new power steering pump and secure it with the mounting bolts.
Reconnect the lines to the power steering pump.
Push the pulley onto the new pump and attach the pulley removal tool to the center bolt.
Attach the 10 millimeter socket with the ratchet and 10 millimeter wrench to the pulley tool.
Rotate the wrench clockwise while holding the ratchet in place.
Tighten the pulley for a snug fit. The pulley is fully on when these surfaces are flush.
Step 5 – Reinstall Components
Put back the lower radiator shroud.
Install and correctly route the drive belt.
Attach the radiator fan and the fan shroud.
Re-install the air intake system.
Replace the two splash guards.
Reconnect the black negative battery terminal.
Step 6 – Add Fresh Fluid
Using a funnel, fill the power steering reservoir until the fluid reaches the max line.
To make sure everything is circulating correctly, turn on the engine and turn the steering wheel from the far left and then to the far right multiple times.
Lastly, check the power steering fluid level once more and top off if needed.
With a new power steering pump installed in your Silverado, load up your truck with the confidence that it’s up to the task of getting the job done.