Historical Data David Brown Gearbox?
Historical Data David Brown Gearbox?
(OP)
Would anyone have information on an old David Brown NH-12 gear box; by old I mean 1940's vintage. I have a client in the Pulp and Paper industry that is looking to increase the horsepower on their existing gear box (and they do not have the $$ to buy and install a new gear box). I am looking for:
a. the thermal horsepower rating
b. the maximum horsepower rating
I am looking for ratings between 900 - 1200 rpm (but I'll take anything anyone has) with a gear reduction of 5.3:1.
After doing extensive searching, I have exhausted my resources. Hopefully someone out there has the information I am looking for. The manufacturer does not have data that goes back to the 1940's. There was some loss of information when Textron bought out David Brown.
a. the thermal horsepower rating
b. the maximum horsepower rating
I am looking for ratings between 900 - 1200 rpm (but I'll take anything anyone has) with a gear reduction of 5.3:1.
After doing extensive searching, I have exhausted my resources. Hopefully someone out there has the information I am looking for. The manufacturer does not have data that goes back to the 1940's. There was some loss of information when Textron bought out David Brown.





RE: Historical Data David Brown Gearbox?
Even if this is not a worm gear, I would swap the oil for synthetic and use the higher HP motor, what have you got to lose? a 70 year old gearbox? I'm sure it doesn't owe you anything.
Russell Giuliano
RE: Historical Data David Brown Gearbox?
You might try some of the older gearbox rebuilders about a manual for your box. We had 4 large gearboxes from the 40's and for some reason they required a speed change. A manual for the boxes was located at a rebuilding company. Come to find out we were running the boxes at 1/2 there design speed for our HP.
RE: Historical Data David Brown Gearbox?
What would happen if they suddenly had NO gear box?
I'd probably visually inspect the gear faces closely for pitting or spalling and magnaglow to locate crax first.
Putting the spurs to an old horse may be looking for trouble.
RE: Historical Data David Brown Gearbox?
RE: Historical Data David Brown Gearbox?