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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 04-25-2009
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Default Power steering hoses

I replaced the feed side hose from the reservoir to the pump. The old hose was routed down to the bottom of the frame, then looped in a big loop horizontaly and then routed back up to the pump. I would seem that the more direct the better, right? Is there a reason it would be routed this way or is it just what someone thought was a good idea?

Unfortunately while installing the new hose I realized it was kind of easy to squeeze. After researching I found I had purchased was fuel hose, not power steering hose. I don't think it is stiff enough to handle suction in the long run.

Here is a picture of the old hose pretty much the way it looked when installed.
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Old 04-25-2009
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Look for PCV duty hose, can take vac, stiffer to work with of course.
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Old 04-26-2009
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After thinking about it a bit more, I probably could use the fuel hose for the return from the steering unit, no negative pressure there and not much positive pressure eather.
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Old 04-26-2009
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i think the fluid will not get along with fuel hose,maybe check with the place you bought the hose?
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Old 04-26-2009
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Hose all ya want, but the pump wants a tank level with it. Under the frame rail is the place, use the original as expansion and level monitoring fluid level. Don't have to be huge, a quart or two would be great.
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Old 04-26-2009
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So Mike,what your saying is the pump will be happier if you add another reservoir down on the frame,level with the pump?
then use the upper tank just for checking and adding fluid.

Mike and I have talked many times about the PS system on an FC,the pump on an FC can pump way more oil than the small (long) hose can provide.
What happens when the pump is trying to suck oil through that small hose is you get cavitation in the pump,from entrained air in the oil being released from the suction.
A tank closer to the pump would help on that cavitation.
A larger hose would help a lot,but thats almost impossible to do with the space available on an FC.
We also think the pulley on the PS pump is too small,and a double pulley would be even better,if we had another empty pulley on the crankshaft.
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Old 04-26-2009
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Yeah, I guess I should submit a metaphor: Like peeing through an enlarged prostate,
but backwards. Sucks don't it? Well, hard to suck is the reality. Them pumps aren't good at pulling, they like to push. I'll go away now.
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Old 04-26-2009
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I am going to go to my local hydraulic hose place this week and get the right stuff. They make them up for back hoe's and other stuff. They also rebuild pumps, but not the one on the bird. I will see what they might have in the way of auxiliary reservoirs.

When I replaced the pump on my '78 they made up the new hi-pressure hose for me. I didn't go there because they were closed when I needed it.
Thanks for the input.
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