PTO Info?

[CJ Johansson]

Does anyone know the specs of what kind of PTO we can hook up to the PTO ports on the NV4500? I know it's a "6 bolt", but apparently, you need to know whether it's a straight or helical gear and what gear pitch or some such. This makes a marginal amount of sense to me, but never having done any PTO work, I'm not really sure what I need to know.



I'm working on putting a PTO powered air compressor on so I can run air tools when fixing broken tractors/implements out in the field. Little pumps like the quick airs, etc. probably won't cut it (sometimes I need to run a *HUGE* 1 inch impact gun for those big 2+ inch nuts at 900+ lb-ft torque... Hmmm, even the mightly Cummins doesn't do that ).



Anyway, I can get the PTO adapter for $50 if I know what I need (from a local truck junk yard). Then, all I need is a tank (probably from the same junk yard) and a compressor (yet to be figured out) and stuff to connect them together. I'll post complete info on how the project turns out when I get it done.



-cj

 

[illflem]

I'm not sure but here's 1800 people who probably do

http://www.google.com/search?q=truck+power+take-offs&btnG=Google+Search&hl=en&newwindow=1

 

[CJ Johansson]

Well, in case anyone's interested, I got some info. I had to go to the source, New Venture Gear, they were extremely helpful and faxed me drawings, etc. right away. Info on the gear is a table with 17 different measurements, probably enough info for a machinist to actually make the gear!



Anyway, the relavent info, I think, is that it's a helical gear, right hand helix, 30 degree helix angle.



Also, it seems, you have to get a "two gear" PTO adapter in order to get the output shaft to clear the transfer case. This is simply a PTO that has one gear that connects to the transmission, a second one on the output shaft. A single gear is just that, the gear is connected to the shaft and reaches into the transmission to engage the gear. This leaves the shaft much closer to the body of the transmission.



A new PTO that will work is a Chelsea (Dana) 442 series, which costs about $340. The used price I was quoted ($50) was for a single gear. I'll have to talk to the guy to see what he'll sell a 2 gear for, though I'm sure it'll be a *LOT* less than $300.



-cj

 

[Don M]

CJ, whatever you find out let me know. Im very interested in this. I wanted to try and run lotsa goodies off the PTO. Did you find out how much HP you can get from it? How big of a thingee can you connect to it?



Things that come to mind would be a PTO generator and PTO chipper/shredder.

The generator may not work cuz the rpm wont be able to be a contant because of the governor in the engine I believe. So that may be out the window. The shredder would be great though.



I seem to remember the gear being straight cut? Guess Im getting old.



Don~

 

[CJ Johansson]

Well, the gear info is that it's a right hand helical, not straight. Here's the full info from NVG:



Number of teeth: 30

Diametral Pitch: 6. 8733

Normal Pitch: 7. 9366

Pressure Angle: 25. 5600 deg

Pressure Angle (Normal): 22. 4987 deg

Pitch Diameter: 4. 3647

Base Diameter: 3. 9376

True Involute Form Diameter (Max): 4. 1453

Root Diameter: 4. 016

Circular Tooth Thickness (Transverse): . 2300 - . 2315

Size over . 25 dia balls 4. 7806 - 4. 7833

Helix Angle 30. 0000 deg

Hand of Helix RH

Lead 23. 7502

Backlash at Final Assembly . 0022 - . 0139

Center Distance 4. 2920



Well, there you have it, recorded for posterity I suppose. I won't pretend to know what it all means though



As for what you can connect it to, it depends completely on the PTO adapter you end up using and the speed you turn the output shaft. I seem to remember from looking at the Chelsea PTO page you can get anywhere from 10 to around 43 HP output, up to around 200 lb-ft torque. This is infor for the PTO adapters only, I don't know what the gear in the transmission will withstand, I didn't ask since I'm wanting an air compressor, it'll only take about 5 HP.



To run a multitude of thingees, I'd think about using a PTO to power a hydraulic pump, then using hydraulics to do whatever you want via cylinders or hydraulic motors.



-cj