Puking power steering pump?

[corelokt]

My pump has been over flowing despite repeated purging / bleeding of the system. I just replaced the pump and need to try it. I am just wondering what would cause this? I do have a screen and magnet filter in the brake return line and the steering return run through the old in radiator cooler, but it worked fine with those before.

 

[ken]

It is probally over heating. It you are on the brakes a lot at low speeds or something is wore out the fluid will over heat and expand then puke out.

 

[cucvrus]

I thought the same thing. If it is getting run thru the oil cooler on the radiator it is getting up to 180 degrees. I doubt it ever gets that hot in stock configuration. On police cars the PS cooler is the size of a pack of cigarettes and hanging loose so air flows over the cooler. But what do I know. I never knew a CUCV needed a PS fluid cooler. Did it do it before the modification?

 

[ken]

I have overheated mine while off roading. If I ride the brakes a lot going down hills at slow speeds it would over heat. I installed a PS cooler from a mid 90'schevy truck with a 6.5. If you put it in the tranny cooler in the rad, you will overheat it! You are introducing heat into the system, making it hotter than it would be with no cooler.

 

[cucvrus]

I thought the same thing. I never heard of overheating the power steering fluid while riding the brakes. But I don't know everything yet?

 

[corelokt]

Okey, I'll bypass the cooler. Maybe plum in a separate one.

 

[corelokt]

Overflowing steering pump.

What would cause the pump to overflow during use? This is a 6.5 turbo truck with serpentine belt.

 

[74M35A2]

Steering fluid expands greatly when heated. Reservoir over-flow usually happens if the pump / steering gear are stuck under pressure continuously, which overheats the fluid, expands it, and it spills over. Should only be pressure on the system when a turn is initiated.

 

[ken]

The fluid is overheating. This can happen for many reasons. Usally from riding the brake pedal a lot.

 

[corelokt]

Picture of pump

 

[corelokt]

Ok. What do I do to fix it? I tried a new pump.
The hydro boost isn't very old either.
Can it be flushed in case it's plugged?

 

[cucvrus]

What would cause the pump to overflow during use? This is a 6.5 turbo truck with serpentine belt.

Are you still running the power steering fluid thru the oil cooler on the radiator?

 

[ken]

Yea if he has it in the oil cooler he will be adding heat. Not taking it away. Unless you are using the brakes a lot off road or down the side of a mountain for miles you won't need a cooler. The engine's oil cooler will preheat the fluid. The return heater hose will be dumping hot water right on it. If you have it plumbed into the drivers side tranny cooler it will be worse. The engines hot water will bring it way too hot.

 

[doghead]

Merged your two threads.

Next time continue one thread on a topic.

 

[rustystud]

Yea if he has it in the oil cooler he will be adding heat. Not taking it away. Unless you are using the brakes a lot off road or down the side of a mountain for miles you won't need a cooler. The engine's oil cooler will preheat the fluid. The return heater hose will be dumping hot water right on it. If you have it plumbed into the drivers side tranny cooler it will be worse. The engines hot water will bring it way too hot.

Yes and no on the oil cooler. Remember the radiator will either heat it or cool it to 180 degrees. Oil in a steering pump doing hard use can reach temperatures of over 250 degrees fast, so the cooler would be a wise choice. I personally have mine running through the transmission cooler lines on the radiator. It then goes to a air cooler in front of the radiator. What I'm basically doing is keeping the fluid at operating temperature at all times. It's been that way for several years now and it works great. Especially in winter, the brakes and steering work much better.
This OP has a different problem. Either he is a "brake dragger" or his steering pump has problems. Possibly plugged filter in the reservoir.

 

[corelokt]

I took it out of the radiator. Does a steering box or the hydro boost possibly cause this?
BTW, second pump, I tried a new one already.

 

[Bighorn]

I took it out of the radiator. Does a steering box or the hydro boost possibly cause this?
BTW, second pump, I tried a new one already.

Is the fluid foamy?
Had this happen to a vehicle once.
It kept over flowing out the power steering pump reservoir cap.
Made a whining noise too.
Turned out to be a leak at the reservoir o-ring seal to the pump.
Didn't leak fluid out but sucked air into the system.
Could you have an air leak into your return line to the ps pump?
The fluid was hot on mine too and it seemed like boiling but it was really just foaming.

Tighten the return line and check all the other connections.

 

[firefox]

This is a real shot in the dark. Would the pump exhibit these symptoms if run backwords?
I suspect it wouldn't even work, but I don't know. The reason I bring this up is because the
op mentioned a serpentine belt which are not used on CUCV's.

 

[cucvrus]

Good point.

 

[Drock]

This is a real shot in the dark. Would the pump exhibit these symptoms if run backwords?
I suspect it wouldn't even work, but I don't know. The reason I bring this up is because the
op mentioned a serpentine belt which are not used on CUCV's.

Agreed!