Quick Coupler Boss Welding

Does anyone know where I can get working drawings/measurements for the quick coupler line boss mounts attached for a Cat 962M? Would like to keep it as close to factory as possible. Would I be right in assuming the round bosses need a weld all the way around and rectangle/square bosses just get welded vertical and gap filler horizontal to stop rust streaks like the grease line bosses?

I could be wrong, but the square ones need to be welded on the horizontal with care taken not to leave a crater in the end of the weld by backing up 1/4 inch when you get near the end. Don't overweld as these things don't hold 5 tons of weight or force. Just silicone the ends of the blocks and paint over. On the round ones I would just weld from 11o'clock to 1o'clock on top and fro 7 o'clock to 5'o'clock on bottom with no craters at end of welds. 7018 of some kind, not hard wire from a wire feeder which is brittle would be my choice. I would be using 3/32 rod only at about 80-90 amps and they will hold on well. Clean paint off welded areas first. The pieces will flex this way with the boom as it bends. I am assuming this is a new casting and the blocks need to be installed. Simon C

Forgot to mention to warm up the area you are welding before each weld with propane torch or the like to help the molecules be better lined up. Simon C

If you would like to post a Serial Number there is probably a detailed instruction with measurements, weld procedures, etc, for the installation of a QC. That will include the installation of all the blocks. Simon C said: I could be wrong, but the square ones need to be welded on the horizontal with care taken not to leave a crater in the end of the weld by backing up 1/4 inch when you get near the end. Click to expand... Agreed. Don't make any weld perpendicular to the lift arms. Weld the blocks only along the long side and if you like run the weld past the end of the block, curve it away slightly and tail it off to nothing.

Nige said: Agreed. Don't make any weld perpendicular to the lift arms. Weld the blocks only along the long side and if you like run the weld past the end of the block, curve it away slightly and tail it off to nothing. Click to expand... That is how I was taught also. Have to allow for some bend and not create a pinch point that starts a crack. Simon C

I'm not sure if loader arms are stress relieved from the factory like some excavator booms are? As far as welding it might depend on the heat input.

Simon C said: I could be wrong, but the square ones need to be welded on the horizontal with care taken not to leave a crater in the end of the weld by backing up 1/4 inch when you get near the end. Don't overweld as these things don't hold 5 tons of weight or force. Just silicone the ends of the blocks and paint over. On the round ones I would just weld from 11o'clock to 1o'clock on top and fro 7 o'clock to 5'o'clock on bottom with no craters at end of welds. 7018 of some kind, not hard wire from a wire feeder which is brittle would be my choice. I would be using 3/32 rod only at about 80-90 amps and they will hold on well. Clean paint off welded areas first. The pieces will flex this way with the boom as it bends. I am assuming this is a new casting and the blocks need to be installed. Simon C Click to expand... Could weld from each end and leave the final crater in the middle. I'm not sure if loader arms are stress relieved from the factory like some excavator booms are? Preheat will help reduce stress. Steel plate has the grain structure in all directions unlike flat bar or beams that have it in one direction only. That's why a lot small parts are made from plate rather than flat bar.

Welder Dave said: Could weld from each end and leave the final crater in the middle. I'm not sure if loader arms are stress relieved from the factory like some excavator booms are? Preheat will help reduce stress. Steel plate has the grain structure in all directions unlike flat bar or beams that have it in one direction only. That's why a lot small parts are made from plate rather than flat bar. Click to expand... That would work well as well and allow the block to bend as the boom bends as small as it does. The only thing is to ensure there is no crater at end of weld. Simon C

Nige said: If you would like to post a Serial Number there is probably a detailed instruction with measurements, weld procedures, etc, for the installation of a QC. That will include the installation of all the blocks. Agreed. Don't make any weld perpendicular to the lift arms. Weld the blocks only along the long side and if you like run the weld past the end of the block, curve it away slightly and tail it off to nothing. Click to expand... Hi Nige, Serial is LSE20289

Simon C said: That is how I was taught also. Have to allow for some bend and not create a pinch point that starts a crack. Simon C Click to expand... Thats what i thought also, weld it like a trailer drawbar, horizontal only. However the bosses for the auto greaser lines on the other side of the lift arm have put me off a bit because they are welded on the vertical side from factory.

Might not be enough heat input to affect the arms or mounted in a low stress area of the arms.

DSharpy said: Serial is LSE20289 Click to expand... See the attachment. It has all the measurements you are looking for, plus a heap of other information.

Nige said: See the attachment. It has all the measurements you are looking for, plus a heap of other information. Click to expand... That’s perfect, Thanks Nige