SOURCE: 1987 Chevy G20 van replace power steering pump
Does your van have the serpentine belt? If so maybe I can help, I replaced the Power steering pump on my 90 G20 a couple of weeks ago. The trick is that you need to pull the pump pulley which is pressed on to access the mounting bolts which attach the pump to the engine. Harbor Freight tools sells a great tool designed for this job for $20.00. Once you have the correct tools, remove the serpentine drive belt. You may also need to remove the fan shroud. the pump shaft looks like it has an allen socket in the center, but this is for use in the manufacturing process, and will not come out. Place the puller tool on the pulley following tthe instruction that come with the tool, and remove the pulley. loosen, but do not remove the nut on the high pressure hose connection. use a pair of **** pliers to cut and remove the crimp clamp on the low pressure hose. If your pump has the remote reservour loosen the clamp on the reservour hose also. Remove the three mounting bolts, place a large pan under the pump to catch drips, and remove the prevously loosened hoses. there will be fluid leaking all over and the pump should come free, There are two types of replacement pump sold. With and without reservour. This reservour is a metal cover that fits over the back of the pump, and should not be confused with the reomte revervour found on some newer models which is next to the battery. This reservour is held in place be two throught the pump bolts which are removed at the back of the pump. If your new pump has a reservour you will probably still need to remove these bolts and put them in the replacement pump as most are shiped without these bolts. If you replacement pump comes without a reservour pull the bolts, the reservour should pull off of the old pump and slide onto the new one. check the o rings and replace the through the pump bolts. Installation is the reverse of removal execpt that 1/2" hose clamps replace the crimp clamps on the low pressure hose, and the puller tool is set up differently to replace the pulley. Finally if you don't flush contaminants out of the system your repair will last maybe a week. www.cardone.com has a great article about power steering flushing, read it before you start Good luck.
SOURCE: high pressure power steering hose on a 1995 surburban
PUMP R&R PROCEDURE at Bottom
Do I need to pull the power steering pump off of the 1995 surbuban 350 engine in order to replace the high pressure hose?<-You Ask.
NO Not on the 95 and If you do need or want to REMOVE the PUMP it Comes off Without the Removal of P/S Pump Pulley. Now if you are replacing the P/S Unit Yhere is A Special tool fo pull off Pulley .
Ist a Universal tool for Ford & GM just P/S Pump Pulley Removal Tool Auto Zone has en for $40.00 or rent it from them.
POWRE STEERING PUMP R&R
Removal/Installation
Notes
SOURCE: remove the power steering pump pulley on a 2003 monte carlo
you can either remove the steering pump to gain access,if there is no holes in PS pump pulley,you can rent a pulley puller....can be a ***** to get in and use them though....I will drill a hole in it for next time whenever I replace a pump on cars without ....
SOURCE: 2004 chevy trailblazer-Reduce engine power
You need to get the fault codes read to determine where the problem is that set the SES light. Autozone will scan your car at no charge. At some point you will need to get a mechanic involved to further diagnose the codes.
Fig. Fig. 2: Installing the pilot bolt 
Fig. Fig. 3: Removing the power steering pump pulley 
Fig. Fig. 4: Installing the power steering pump pulley 44 views
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