You will need to rent or buy a PS steering puller. The PS pulley has a ridge that the puller seats on. Then you crank the screw on the middle of the puller to get the pulley off the shaft.
You can rent the tool at Autozone or other auto parts stores.
I have used a bearing separator & harmonic balancer puller together to do the job.
Use this tool to put it back on...
I usually just use the bolt that comes with the new PS pump.
The pump should come with the O ring for the high pressure line.
The return hoses are all low pressure and are most commonly secured to the pump and associated plumbing with worm gear hose clamps. After a while they will frequently soften up at the end where they are clamped, and should be replaced. The auto parts store will sell you hose by the foot and it takes about 3 feet or less, depending if you have the fluid cooler in the low pressure side of the line.
The high pressure hoses have an “O” ring at the fitting end and will swivel even when the fitting is completely tightened. They are factory assembled and not repairable – if any end is damaged, replace the hose assembly.
Buy several extra quarts of fluid to run through the system to flush it when you change the pump. The car needs to be up on jackstands for the next step. Fill the pump up, start the car, and turn the wheels lock to lock to bleed the air out. Then stop the engine, disconnect the low pressure hose (the one that is secured with a hose clamp) and drain the pump. Re-connect, refill and do it several more times or until the fluid looks clear and not burnt or black.
