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If some of the pump blades (I think there are 10) were inserted in the pump backwards (rounded edges toward the center), I was told by an MB tech it will decrease the power assist. Was the pump rebuilt?
Also, if there was a tiny protective rubber plug in the output side of the pump and it was not taken out when the pump was installed, it could create a restriction and end up at the entry of the gearbox (ask me how I know). You can take the line off between the pump and the gearbox and check for restrictions.
The first picture is the way the pump came with a tiny plug to protect the outlet port. The second picture is where the plug was found (melted) after spending 15 hours trying to figure out why no power assist.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
Last edited by emerydc8; 10-28-2008 at 07:54 AM.
Reason: Added Pictures
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