Whine in power steering pump after replacing SLS pressure hose - W124

[Dylan]

1988 300TE, 230,000 miles
Replaced leaking SLS pressure hose with a Gates 6G2 steel braided hydraulic hose from an industrial supply store. I drained the hydraulic fluid by suction from the tank and replaced with Febi hydraulic fluid (2 liters). Bled the hydraulic system. Replaced the power steering filter, flushed and refilled with power steering fluid. The SLS system works (raising and lowering). This is a W124 with the SLS/PWR steering combo platter pump. The whine starts when you start the engine and increases with engine speed. There is no change in sound when you turn left or right. The sound can only be heard inside the vehicle, not under the hood. Is this the wrong type hose for this car? When I took the old hose off nothing came out of it (plastic doohickies). Can anyone offer some infor into this? Thanks.