PDF associated:
/PT 20-0028.pdf
JDB0300 PT 20 0028 Ten Steps to Trouble shoot Power Steering Pumps What are the things that must be done to ensure successful diagnosis installation and testing of a replacement power steering pump The following ten questions outline the most common causes of failure trouble shooting suggestions diagnostic tips and proven installation procedures and practices 1 Question What is the problem now Answer If the original problem continues after replacement pump installation the pump most likely is not the original cause of the problem 2 Question What was the original problem Was the root cause of failure corrected Answer Was fluid contaminated did the pump run dry or was the wrong fluid used Inspect hoses for damage or internal restriction Check for damaged pulleys incorrect belt tension or a defective belt tensioner If pump is electronically controlled is the EVO valve faulty and is the controller working properly 3 Question Were modifications made to the steering system or a change in tire size Answer Replacement pumps are OEM replacements intended for unmodified standard use applications They are not suited for off road use lift kits over sized tires or similar modifications and will void unit warranty if so used 4 Question Were all steering suspension components operating freely Answer Check all mechanical steering components for proper function Do not overlook steering wheel shaft and coupler 5 Question Were the hoses and or filter replaced per the manufacturer s specific service intervals Answer The single most common cause of failure of the original and replacement units is defective hoses followed by contamination If hoses are more then 5 years old and haven t been changed you have an impending problem 6 Question Was the old fluid inspected for signs of overheating or contamination Answer Burnt smelling fluid indicates the pump was working under heavy load possibly due to restricted hoses or modified suspension or tires Dark or black fluid usually is an indication of metal in the system or deteriorated hoses 7 Question Was OE certified fluid used to replace the old fluid Answer Never use fluid intended for topping off Use only OE approved power steering fluid 8 Question Was the system properly flushed was a filter installed Answer When any power steering component is changed pump steering unit hoses the old fluid must be completely flushed out and replaced Adding a filter helps protect the replacement unit especially if hoses are not changed or if flushing is done incorrectly 9 Question If pump is a remote reservoir type was the reservoir screen checked for blockage What is the condition of the hose between the reservoir and the pump Answer Most imports have some type of screen or filter in the bottom of the upper reservoir that must be flushed The feed hose between the upper reservoir and the pump often collapse or get pinched 10 Question Did you follow any special OE bleed procedures Answer Always refer to the vehicle service manual for specific installation instruction that might include a bleeding procedure ProTech PT20 0012 Royal Flush can be used for most vehicles Note Please refer to your vehicle s service manual for specific diagnostic instructions This ProTech bulletin is supplied as technical information only and is not an authorization for repair
