Tools You'll Need:
* Wrench set (metric): You'll need various sizes depending on the specific bolts and nuts.
* Socket set (metric): Especially useful for accessing difficult-to-reach fasteners.
* Ratchet: To make wrenching easier.
* Torque wrench: To tighten bolts to the manufacturer's specifications (consult your repair manual).
* Drain pan: To catch the power steering fluid.
* New power steering pump: Ensure it's the correct one for your vehicle.
* New power steering fluid: The correct type for your truck.
* Gloves: To protect your hands.
* Safety glasses: To protect your eyes.
* Shop rags: To clean up spills.
* Pry bar (optional): Might be needed to help separate stubborn connections.
Procedure:
1. Drain the Power Steering Fluid: Locate the power steering fluid reservoir. Open the reservoir cap carefully and drain the fluid into your drain pan. You might need to loosen the return line to completely drain the system.
2. Disconnect the Pressure Switch: This is the trickiest part. The pressure switch is typically mounted on the pump itself. It's usually held in place by a single nut or bolt.
* Locate the Switch: Carefully examine the power steering pump. The pressure switch is often a small cylindrical device with one or two wires connected.
* Disconnect the Wiring: Gently unplug the electrical connector from the pressure switch.
* Remove the Nut/Bolt: Use the appropriate wrench or socket to remove the nut or bolt holding the pressure switch to the pump. Be careful not to damage the switch threads. Some switches may have a retaining clip that needs to be removed first.
3. Disconnect the Power Steering Hoses: There are usually two hoses connected to the pump: a pressure hose (thicker and usually high-pressure) and a return hose (thinner).
* Pressure Hose: Use appropriate wrenches or clamps to loosen the clamps holding the pressure hose to the pump. Some vehicles might use quick-disconnect fittings which are easier to remove.
* Return Hose: Repeat the process for the return hose.
* Collect Spilled Fluid: Be prepared for some fluid spillage.
4. Remove the Power Steering Pump Pulley (if necessary): Some power steering pumps require you to remove the pulley before the pump can be removed. This usually involves removing a bolt in the center of the pulley. Use a pulley puller if necessary. Be mindful of the pulley's position to avoid damaging any surrounding components during removal.
5. Remove the Power Steering Pump: This step is dependent on how the pump is mounted, but generally involves removing several bolts attaching it to the engine block. Be prepared for the pump to be slightly heavy.
6. Install the New Power Steering Pump: Reverse the removal steps to install the new pump. Ensure the pump's alignment is correct before tightening the mounting bolts. Torque them to the manufacturer's specifications (consult your repair manual).
7. Reconnect the Pressure Switch: Carefully install the new or old (cleaned) pressure switch, making sure the threads are clean and properly engaged. Tighten the nut/bolt to the correct torque. Reconnect the electrical connector.
8. Reconnect the Power Steering Hoses: Reconnect the pressure and return hoses, making sure the clamps are tight and secure. Check for leaks before proceeding.
9. Reconnect the Power Steering Pump Pulley (if necessary): Install the pulley and tighten the center bolt.
10. Fill the Power Steering Fluid Reservoir: Fill the reservoir with the correct type of power steering fluid, following the manufacturer's recommendations. Consult your owner's manual for the correct fluid specification.
11. Bleed the Air from the System (important): Start the engine and turn the steering wheel fully left and right several times to bleed air from the system. Check the fluid level and add more if necessary. Keep checking the fluid level over the next few days as any trapped air might cause foaming. Look for any leaks around the hoses and pump.
12. Check for Leaks: Inspect all connections for leaks. If any leaks are found, re-tighten the connections or replace damaged parts.
Important Notes:
* Consult a Repair Manual: A repair manual specific to your 1998 Chevy Cheyenne will provide detailed diagrams, torque specifications, and step-by-step instructions. This is crucial for successful and safe completion of the job.
* Safety First: Always disconnect the negative battery terminal before starting any repair work.
* Proper Fluid: Use only the recommended power steering fluid for your vehicle. Using the incorrect fluid can damage the pump and other components.
If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improper installation can lead to serious damage to your vehicle's steering system.
