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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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  #111  
Old 02-10-2020
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1984Lodge 1984Lodge is offline
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Quote:
Originally Posted by badandy View Post
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.
I am on it... will let you know what I find.. you remember the GPM for the fan motor at max...
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Jeff LoGiudice
1984LodgeJeff@gmail.com
Temple Terrace, Florida
1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
6V92TA & HT740 (Sold)
YouTube-Gino's Garage https://www.youtube.com/user/xjrjeff
http://www.bbirdmaps.com/index.cfm #460
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  #112  
Old 02-10-2020
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The pump flows 1.94 ci/rev, max of 3000 rpm. So that's 5820 ci at 3000 rpm, or about 25 gallons per minute.
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  #113  
Old 02-10-2020
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1984Lodge 1984Lodge is offline
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The pump flows 1.94 ci/rev, max of 3000 rpm. So that's 5820 ci at 3000 rpm, or about 25 gallons per minute.
Got it... I was thinking around 20 gpm.. now to find a valve that will flow that much..
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Jeff LoGiudice
1984LodgeJeff@gmail.com
Temple Terrace, Florida
1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
6V92TA & HT740 (Sold)
YouTube-Gino's Garage https://www.youtube.com/user/xjrjeff
http://www.bbirdmaps.com/index.cfm #460
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  #114  
Old 02-10-2020
GregOC GregOC is offline
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what are you using to collect the resistance data and calculate a pulse width output? the electric fan pwm controllers send a higher % to run the fan faster. the proportional valves in many fan apps are set to run full speed at no pulse and at 95% pulse they shut flow to a ****.
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  #115  
Old 02-10-2020
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what are you using to collect the resistance data and calculate a pulse width output? the electric fan pwm controllers send a higher % to run the fan faster. the proportional valves in many fan apps are set to run full speed at no pulse and at 95% pulse they shut flow to a ****.
A PCB I built and programmed. It has a GM temp sensor for input, CAN bus for communications/programming, and directly controls the PWM valve. I can make it do whatever I want...
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  #116  
Old 02-11-2020
GregOC GregOC is offline
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Cool. Arduino? Some of those proportional valves need stable voltage I set one up at 20 volts and stepped it down from 24vdc
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  #117  
Old 02-11-2020
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It's not an Arduino, it's a board I designed from scratch, but it's using an AVR. Everything is written in C. The Danfoss valve is 12v, so you can use probably PWM it at 5-15v without any trouble. I tested it at 12v.
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  #118  
Old 4 Weeks Ago
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I got some play time today so I wanted to get the rest of the new hydraulic hoses made. It turns out the return line from the steering gear is a copper tube with a 45 degree flare and they use an air compressor discharge hose to return the fluid to the reservoir (45 deg). But the pressure line to the steering box is a 40' long hose, not copper pipe. Weird stuff I tell ya.
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  #119  
Old 6 Days Ago
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I haven't been posting much because it's been cold and icky outside, and I'm not retired like you all

The PWM fan setup is in and all the mechanicals are done. I have the electronic control built and I'm waiting for connectors for the PWM fan valve to show up so I can wire it. Easy stuff!

New big hydraulic pump installed and fits without issue! I did not replace the supply hose to the power steering box, but I might end up cutting the fitting off and putting a new one on it. It's a goofy fitting with a o-ring sealed swivel that moved pretty freely. It might be a huge leak now, but I'm going to try it. Something is bound to leak.



Fan blades, motor, new reservoir visible:



PWM fan valve mounted and plumbed:



Another view of the fan motor. You can see the hydraulic filter is gone. The return line is a copper 5/8" tube with a compression fitting on the end, you can see the shiny new nut on it. It's hard to see here, but there's a JIC tee here - the power steering section of the new pump and also the power steering box returns merge here and then return into the reservoir.



Here's a photo showing where that Kysor temp switch normally lives. It's gone, replaced with a GM coolant temp sensor! This runs to my electronic box.



Here's the new reservoir hiding behind everything and the PWM valve down low. Res fits in there great, but I had to make spacers to mount it, so then I was able to mount it to the factory unmodified bracket that the old one bolted to. I must be 10" longer than the old one. Please forgive the wires all over the place, I have to remove all of these now that I have no use for 'em, but I haven't got everything done yet. I also put a temp sensor in the bottom of the reservoir.

I'm waiting for connectors to show up so I can finish wiring this all up to my electronics. It's ready to start, but I don't have the exhaust back on yet and coolant is still dumped for another project.

I feel sore just from posting this.
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