greetings,

I had to ponder this for a bit but I think I can help,

1. have you measured the gear teeth-both drive and driven sets?

is your system a dual drive with front and rear gear sets?

2. Do you have the equipment to measure the tooth sizes of the drive and driven gears?. are they Spur,Herringbone or Helix cut?

3 What are the condition of the drive tires? If they are in poor shape chances are you will not want to bother with gear reversal-

internal stress cracks being a culprit.

4. You will want to change the pinion gear or gears and bearings

anyway.

5. Do you have access to a hydraulic bolt tightening tool?

this will allow you to dismount and retorque the bolts properly.

the other problem being that when you get into a torque value this high you will have to find out if the manufacturer used a lubricated or dry torqued value if it is a lubricated value the torque value allowed is considerably higher than a dry torqued bolt. These torque values are readily available in any machinists

hand book such as Audells.

5a. When the mill was erected did they use a product such as Locktite brand aneorobic thread locker? If so you will need to lay in a supply of this thread locker.

5b. You should also have a complete stock of replacement bolts and extras for your installation-you have to remember that these bolts have been under huge stresses during the mills life.

you should also have taps and dies for the bolts and bolt holes.

If the bolts are wired in place -due to the amount of vibration you must make sure they are wired back in place after they are properly torqued.



5c. I also hope that the bolts holding the gears are Allen head cap screws-they are easier to work with and require fewer tools.

If they are Allen head cap screws- YOU MUST REPLACE THE ALLEN HEAD LOCK WASHERS WITH NEW ONES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

5d. double check the torque values to make sure that you use the same system I.E. metric.

If you can lay in a supply of isopropyl alcohol this is also a greeat cleaning tool and leaves no residue.

PS if you cannot find the torque values leave me a message on the board and I will post them here.

On the job safety is first and foremost.

This mechanics opinion ■

U should also be talking to Kp as well.....it is their machine and they would kinow all the tricks.

Pls be aware that the bolt holes may not line up when U rotate it - the gear...hence, it is suggested that the hole are plug welded and redrilled acc.

I have heard of a site where this was not consider with a resulting 10 days extra in re-works. The engineer in charge did not work there much longer.

Cheers

James ■