Weird steering

[matuva]

Today, we change my power steering pump (putting back a new in bow Dorman chinese pulley was a PITA, we ended putting back the old one...), and the power steering unit + pitman.

The power unit was a used one which appeared to get a few water inside. We tried to flush it at the best, but sure a few water may remain.

After all job done, the first minutes of road test were fine. Then, I start hearing the pump whining a bit.
We stop, check level, all good. We continued road testing and a few minutes after, I feel the truck the same as if it was braking, from it's own.
I left off the pedal, and the truck slow down like if I was slightly actuating brakes, and when I turn the wheel, it brakes stronger, by itself

Checked everything, no leaks, good level, but the ATF was cloudy, a bit milky :mad2:

Water pollution I believe.

We let the truck sit on the side a few minutes, tried again, and all symptoms have dissapeared.

Back to the garage, I flushed the pump reservoir, add new ATF, and went for another test. Smooth steering, no wild brakings, the pump is still whining a bit, but time to time, not at all steering.

Any idea of what has happened ? I bet the water pollution is the culprit, but why does this cause "wild brakings" and whining pump ?

I will drive a bit and flush the reservoir each week for a while. Should it be enough to cure ?

 

[Burning oil]

I bet you had a bunch of air in the system especialy with hydro boost brakes. Did you go through the "bleeding" process? on the replacement pump. There will be lots of foaming and the brakes will act strange until you get all the air out. Pump will whine also.

Off the subject, I will going over to your side of the world in Nov. We are going back to Singapore. Wanna meet up? maybe you can drive your truck to Singapore? ):h

 

[ghitch75]

when you bleed just setting still @ idle.....crank the steering wheel as far as you can to the right then left about 5 or 6 times.....then pump the brakes 5 or 6 times and that should breed all the air out....

 

[matuva]

I bet you had a bunch of air in the system especialy with hydro boost brakes. Did you go through the "bleeding" process? on the replacement pump. There will be lots of foaming and the brakes will act strange until you get all the air out. Pump will whine also.

AIR! Damn!! :mad2: You know I may be stupid sometimes. Good point : that's an hydraulic circuit, and air has nothing to do inside! I remarked foam inside the reservoir at first start, and did not even think about bleeding...
Let's say I was just tired :rolleyes5:

Off the subject, I will going over to your side of the world in Nov. We are going back to Singapore. Wanna meet up? maybe you can drive your truck to Singapore? ):h

I would love to meet a DTR member, especially one I appreciate like you. I hope that by Nov I will have time enough to transform my 6.5 in a boat or a sub

Oh, BTW, off topic too, my customer is very happy with the air intake kit you made for his MAF truck.
I will take some pics ASAP

when you bleed just setting still @ idle.....crank the steering wheel as far as you can to the right then left about 5 or 6 times.....then pump the brakes 5 or 6 times and that should breed all the air out....

Thanks for the tip, I will do :thumbsup:

 

[matuva]

Thanks Guys! Everything is OK after flushing and bleeding

 

[ghitch75]

glad you got it fixed......

 

[dangerousdave]

This is a great thread or subject for a sticky.