2000 Freightliner Century Power steering intermittent

Did you crack the lines from pump to box at least.sounds like while sitting air bubbles go up fluid settles w/ no air in box then ehenvstarted pump pushes air into box

 

Try running w cap off and crack all lines loose while refilling reservoir. Your not going to see bubbles if trapped

 

If it’s got a hose w a bend or half loop that’s in a high spot in system . I’ve changed filters box never had problem like w yours mines Fld different hose design ?

 

I had a Ford pu w same problem it was the box

 

If you have a set up where the passenger side steering knuckle has a hydraulic ram disconnect it & plug the line

Start the truck
Turn til it's stiff
Mark location & undo 9/16? Bolt holding steering shaft to gear.
Turn the shaft by hand that'll eliminate or confirm bad u joint, slip joint, steering column

If your answer ain't there
Disconnect hoses at both sides
Blow into them w your mouth
If u cant blow air thru it's that hose

If your answer ain't there
Reconnect pressure hose to pump
Fill res with fluid
Start the truck
If your engine bay isn't soaked in ATF your pump is poop

If your answer ain't there
Either you did something wrong
Or they sold you a bad gear

Or if you have that hydraulic ram.. it has a bad valve. Get it rebuilt. Also not cheap. But I'm cheap which makes everything expensive to me

 

U have to eliminate components one by one until u find the culprit. It's the diagnostic process. Otherwise your gonna pay for each of your guesses whether it's right or wrong. It's gonna cost you money but it's also gonna cost u time & opportunity. If you don't wanna spend time diagnosing jus limp it or tow it to a shop & they'll do the diagnostic process & charge u money for their time & charge you money for parts and labor. The choice is yours.

 

What’s the T for? Power bleeding? Never saw that. Good luck plz update when repaired