Scream from power steering on full lock
Posted: Wed Dec 21, 2016 1:09 pm
This is caused by the drive belt to the power steering pump slipping when steering reaches its mechanical limit.
In theory there is a mechanical blow off valve but this requires significant pressure to trigger it. Better to allow the belt to slip and remove load from more delicate parts of system. Just turn steering wheel one degree towards centre to take excessive load off system and scream will stop.
If scream occurs when turning wheel at moderate angles then drive belt is probably just a little too slack. Do not over-tighten. A drive belt is far cheaper than a hydraulic pump.
In theory there is a mechanical blow off valve but this requires significant pressure to trigger it. Better to allow the belt to slip and remove load from more delicate parts of system. Just turn steering wheel one degree towards centre to take excessive load off system and scream will stop.
If scream occurs when turning wheel at moderate angles then drive belt is probably just a little too slack. Do not over-tighten. A drive belt is far cheaper than a hydraulic pump.