oil coolers in PTO boss area

malibu795

misspeelleerr
Apr 28, 2007
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saw it in diesel power? guy had finned cooler ona manual onthe PTO boss area.

yes no?

example
0906dp_08_z+2003_dodge_ram_2500+nv4500_transmission.jpg


When Kent originally bought the truck it was fitted with an NV5600 manual transmission. That six-speed was replaced when it melted down after a rollover in the Parker 400 race (no oil) with this five-speed NV4500. To cope with the torque of the Cummins (and the heat of Africa), the transmission was fitted with a South Bend clutch and dual aluminum PTO coolers.
 
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TrentNell

Finally underway !!!!!
Jul 7, 2008
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One problem i can see is no oil runs through our pto covers . It just splashes around in there from the front drum rotating . on the manual it looks like it might increase the fluid capacity though and the air would blow ascross them for cooling .
 
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Mike L.

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Aug 12, 2006
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Fluid needs to be directed and passed through a heat exchanger for any significant cooling. I had some clear plastic pto covers made to watch wht was going on and it sure doesn't slash much at either cover. Another money making scam like the stainless spin on over at DP.
 

TrentNell

Finally underway !!!!!
Jul 7, 2008
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Fluid needs to be directed and passed through a heat exchanger for any significant cooling. I had some clear plastic pto covers made to watch wht was going on and it sure doesn't slash much at either cover. Another money making scam like the stainless spin on over at DP.

i saw that thread.............. i almost bought it for the firmer shifts :spit::rofl:
 

JoshH

Daggum farm truck
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Feb 14, 2007
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Fluid needs to be directed and passed through a heat exchanger for any significant cooling. I had some clear plastic pto covers made to watch wht was going on and it sure doesn't slash much at either cover. Another money making scam like the stainless spin on over at DP.

i saw that thread.............. i almost bought it for the firmer shifts :spit::rofl:
Link?
 

Mike L.

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What people don't understand is the spin on filter is in the control main pressure circuit ( control main pressure is knocked down main pressure ). This low pressure circuit is there to control the solenoids operation which cannot function under high pressure because they will hydraulicly jam. When the control main pressure opens or closes the solenoid a trim valve strokes letting pressure flow to the clutches from a different path. So you see that we are only controling the solenoid. Now a differently engineered solenoid would make a differenc in a shift but that can get very touchy without proper testing and break hard parts.
 

JoshH

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Mike, how does modding the pressures in the pump with spring shims, ATS pump kits, converter valves, etc. effect the solenoids? Is this something totally different than what you are talking about?
 

Mike L.

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Mike, how does modding the pressures in the pump with spring shims, ATS pump kits, converter valves, etc. effect the solenoids? Is this something totally different than what you are talking about?

It ties into the same thing.
Adding a shim at the pressure regulator valve will increase mainline pressure ( the pressure the pump puts out constantly ) from 245 psi stock to about 275-280 psi. Now the C1 and C2 clutches are directly fed by this mainline pressure but the C3 and C4 are not; they are fed by control main pressure which is about 125 psi. Remember control main pressure is 125 psi and controlled by the control main pressure regulator valve which will dump anything over 126-129 psi back to sump so increasing main line pressure will not help the C3 and C4. Hence the Transgo trim valves which are designed to leak main line pressure into the control main circuit ( 245 psi into 125 psi ) and now the C3 and C4 clutches are seeing main line pressure and will lock and hold a lot better. The ATS spring increases pressure anywhere from 300-325 psi
 

JoshH

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Cool. Thanks for explaining that to me. I never really understood what the difference between main line and control main were and how the transgo valves tied into both. It all makes a little more sense to me now.
 

whitetrash21

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Apr 29, 2008
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Thats the kinda stuff I like learning about. Always hear about why the C3 are usually first to burn.... now I know the reason why. thx Mike