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PT & WB (Twin Axle Pusher Unique Issues) If you have a unique issue with your PT or WB model coach and it can't be answered in one of the other forums here, then this is where you can list it....list your PT Parts here too.

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  #101  
Old 02-09-2020
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The new pump powers the fan and power steering both, which the old pump also did. The difference is that this pump, which is from the later 80's birds, flows more and is a dual-stage pump. The power steering and fan basically have their own pump sections, so one doesn't affect the other one. It's not a huge deal, but I wanted the extra flow and the pump was the exact same price is the old model. It bolts onto the engine the same, no changes there, but it has 1 more port on it, which is the return line for the power steering stage. It just runs to the reservoir or you can tee it into the return from the power steering box and then just run that to the reservoir. Got all that? Have I said I type fast?
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  #102  
Old 02-09-2020
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Quote:
Originally Posted by badandy View Post
The new pump powers the fan and power steering both, which the old pump also did. The difference is that this pump, which is from the later 80's birds, flows more and is a dual-stage pump. The power steering and fan basically have their own pump sections, so one doesn't affect the other one. It's not a huge deal, but I wanted the extra flow and the pump was the exact same price is the old model. It bolts onto the engine the same, no changes there, but it has 1 more port on it, which is the return line for the power steering stage. It just runs to the reservoir or you can tee it into the return from the power steering box and then just run that to the reservoir. Got all that? Have I said I type fast?
I knew all that before you typed it!
Just pimping for the other guys,that may not be in the loop~!
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  #103  
Old 02-09-2020
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Yup it's good to clear things up. I tend to think out loud sometimes. I'll get more pictures this week after I clear the snow.
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  #104  
Old 02-10-2020
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Could you repeat that slower so us dummies can get it
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  #105  
Old 02-10-2020
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Originally Posted by patticake View Post
Could you repeat that slower so us dummies can get it
I installed the same pump as your coach has. It hurt a lot. More at 11.
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  #106  
Old 02-10-2020
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Now, that I understand
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  #107  
Old 02-10-2020
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Andy, did you cover what the part number or model of the valve that controls the fan flow is? I was just curious if I could drop that in place of the on-off one that’s in there now without having to modify the rest of the system.. question is for folks like me that have already replaced everything and do not want to tear the whole system out again..
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  #108  
Old 02-10-2020
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Originally Posted by 1984Lodge View Post
Andy, did you cover what the part number or model of the valve that controls the fan flow is? I was just curious if I could drop that in place of the on-off one that’s in there now without having to modify the rest of the system..
You can't just drop the PWM valve in your system because it only controls pilot pressure. The fan motor would have to be changed, too. The fan motor has the apparatus on it that actually does the fluid bypassing and it's flow is controlled by the PWM valve. You could use a wax valve instead of the PWM valve, but you still need the different motor. You could use your existing pump though.
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  #109  
Old 02-10-2020
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Originally Posted by badandy View Post
You can't just drop the PWM valve in your system because it only controls pilot pressure. The fan motor would have to be changed, too. The fan motor has the apparatus on it that actually does the fluid bypassing and it's flow is controlled by the PWM valve. You could use a wax valve instead of the PWM valve, but you still need the different motor. You could use your existing pump though.
So the only other way would be to find a valve that also includes the bypass line like the current valve but is variable flow... ?
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  #110  
Old 02-10-2020
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Originally Posted by 1984Lodge View Post
So the only other way would be to find a valve that also includes the bypass line like the current valve but is variable flow... ?
Yes that's it. And it has to flow a lot of fluid. There are a ton of small valves, but they aren't anywhere near the required flow rate. There is surely one out there somewhere.
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