Evidence of fluid leakage around the mainshaft seal on this pump may be caused by a restriction or blockage somewhere in the pressure lines between the pump outlet and the rack inlet. Be sure to check for blockages in the pressure lines before consider this repair to be complete and correct. The supplied o-rings MUST be used when reinstalling the reservoir on this pump. Failure to do so may lead to noise or leakage problems which are NOT covered by the manufacturer's warranty.