power steering problem

[kool444]

just replaced power steering pump and gear box on my 1997 GMC Sierra 1500. Steering feels a little firm when driving at highway speeds but not bad. It's when I turn into a parking lot or make a turn at low speeds that it gets hard and jumpy. Please advise.

[02suburbanZ71]

Did you make sure the belt is on properly and has the right amount of fluid?

[kool444]

Yes, it all checks out

[gmtech4]

let me guess ,,,,,,its a jobber pump ,,,,,

 

was it bled properly ?

[daxr]

The last aftermarket pump I put it a GM wouldn't bleed out or build pressure. I had to fill the high pressure line and force the fluid past the pressure valve with air, after which it worked fine - for a few days, when it came back with no PS assist again. That's the sort of thing that makes for an aggravating day. I put a better pump in it and that worked right out of the box.

 

I'd suspect the pump.