Required Torque

What's in the drum?

Without knowing details it is only guess work-

max output torque where - definitely not on motor

What and where is the flange? How does the flange matter as far as torque is concerned?

Where is your system designer ?

Lastly why do you want us to do a complete system analysis work for free?

Is this for a cement (concrete)mixer? Please describe your problem. Some in this forum work for free.

As long as we are guessing, how about 100 fathoms (or 200 m) of anchor chain, or 1000 m of line to a sizable trawl net?

What is the outer radius of whatever is wrapped on the drum, and the required line pull? If this fits the situation, just multiply these two numbers (in consistent units).

You see, rskcad, some guys here are bighearted enough to help even in the absence of the most essential information. Information you do not even have the courtesy to supplement when asked. Quite a forum is CR4, no ?? When I read your posting, all I see is some disconnected gibberish.

Sorry what details I got directly typed in the forum.

What are the details I gave here is gear box motor specifications where the gear motor is connected to the concrete mixer drum capacity of 9cum.

Flange dia of gear box- 530 mm

Weight of Concrete mixer drum - 2000kg approx.

Here I needed the solution whether we have chosen correct gear box to the given torque given by the gear box manufacturer.

RSKCAD we are getting a little closer: To start correctly - you will need the position of the drum vs your gearbox motor, (angle) you will need the diameter of the drum, and what is inside. Concrete can give you a lot of different resistances, -dry, sticky, liquid. What obstacle is in the drum is also important, because this will make the load not spin around smoothly but build up momentums that collect whole lumps to let it splash down sometime later. You will need to calculate with the worst possible dynamic situation, or sacrifice life time by going "lighter". That is why some make the warranty time and others last forever. Your system can be mounted on a truck, which makes it even more complicated. If you are doing a repair job, go for what you have there and check what happened- what failed? - bearing- shaft(s) pinions and conclude what might have happened to the old one. Was it poor maintenance, accident or a too small gearbox that caused the failure? When it is a new project for general use you'll definitely need a certified engineer and a signature on the plans. If you replace it with the same gearbox and motor, you are safe. Bigger, usually doesn't hurt either. If you have an existing drum, check what the manufacturer uses. Compare output shafts, gear size and how everything is assembled, because once spinning, the drum can also generate feedback to your gearbox and motor and nothing should come loose. These drum also spin in reverse. When the output shaft breaks, you don't want that full drum rolling down in the streets?