Check power steering pump pulley may be positioned too far inboard on the power steering pump
inspect the Ps pump pulley for proper positioning on the PS pump shaft.
If it is determined that the pulley is not even /flush with the end of the shaft (+/_ 0.25mm 0.010in )
reposition Ps pump pulley
inspect belt and belt tensioner
TECHNICAL SERVICE BULLETIN
A recently completed analysis of returned power steering (PS) pumps that had been replaced for noise, no power assist, no or low pressure and leaking conditions has indicated a high number of "No Trouble Found" results.
Service Bulletin Number 01-02-32-004 indicates that when attempting to repair a power steering concern, the steering system analyzer should be utilized to assist the technician in a successful diagnosis. Note- Saturn ASTRA does not utilize the Power Steering System Analyzer.
In addition, extensive warranty analysis has shown that the following situations are all significant root causes of PS pump failures:
Improper pulley installation
Re-using the O-rings
Using fluid other than the OE-specified steering fluid
Failure to flush the PS system
In order to help improve customer satisfaction and reduce comebacks, GM recommends the following tips for replacing a PS pump:
Low or no pressure from the PS pump may be the results of dirty or contaminated fluid, which could cause the pressure relief valve to stop functioning. Using the proper tools, flush and bleed the PS system. Any residual contaminants will result in pump failure.
When removing the pulley, use the proper special tools. Because the pulley alignment is critical, distorting the pulley may damage bearings on the new PS pump.
Be sure to use only the new O-rings included with the PS pump. The new reservoir O-ring must be lubricated with OE-specific PS fluid prior to installation. Also make sure that the control valve O-ring is in its exact groove position and is NOT covering the pressure bypass hole.
Bleed the PS system according to the procedures/recommendations in SI.
Following these procedures and using the correct tools and fluids should help ensure that the new PS pump operates properly. Skipping steps may cost you time and trouble later.
Friday, June 5th, 2009 AT 6:01 AM