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There are certain "repairs" on the pump that are fairly easy. Let's say you have a pump that started having intermittent hydraulic supply issues - power steering goes well and suddenly bad - and it changed into becoming a permanent issue...
This can be caused by the following sceanario:
- The electrical pump has 4 static carbon brushes/blocks sitting on the rotor
- these brushes are having slight contact to the rotor to ensure electrical connectivity
- they are approx 2/3 inch long and spring loaded to maintain the contact to the rotor
- by time, the brushes/blocks wear and thus thus carbon dust is created
- the dust is conducting and stays contained within the electric motor of the pump
- thisin turn can cause shortages and the electric motor thus the pump to fail
What to do:
- Open the electric motor of the pump and removecthe dust with a vacuum cleaner
- check that the brushes/blocks have still material left - if not, they can be replaced ( I asked the question about part number a few weeks ago - no reply)
After removing the dust, I reassembled the pump keeping the old brushes and since then it works fine.
i would say that this is a very common scenario for the pump failure and the main job for the pump rebuilders (incl brush replacement)
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