Yep! I did take the whole diff out, and these are the points that's worth noticing NOT what I did to pull things out but WHY I did those significant stuffs.
Based on what I've comprehended, I looked at it and its the Hypoid final drive helical gears both crown n pinion. I know because position of the pinion its just below the center line of the crown wheel. Then, I HAVE to identify ALL the match marking available, this is crucial for reassembly as well as performing task like checking the the meshing pattern using grease paint to determine the correct load, position, cleareance/ backlash between the pinion and the crown wheel. I MUST notice that a correct meshing and backlash n clearance result in smooth, quiet operation without overtime wear of the components teeth due to loads press on literally wrong location.
There are gears that need to be taken care about all those stuffs: Pinion, crown wheel, side gears, spider gears...and anything that moves like thrusts, bearings, casing
Cleaning and inspecting is a MUST-DO, the condition of the gears, bearings, thrust, collapsible spacer tell us how long these going to last or need replacig right away, these moving parts are sources or noise when operating.
The bearing type used to set the preload on the pinion is the taper-roller needle bearing, associates with a collapsible spacer.
Lubrication is a BIG reason of corrosion and noise, during inspection of the casing of the side gears n spider gears this is what I literally reported:
- The spider gears beds, both were heavily worn out. It shows lots of rust marks n heat marks, result of lack if lubrication and excessive preload n heat. This can be sanded and preload need to be reset.
SO this means that there is lack of lube=> lube every internal moving part, do it correctly enough. About the preload, i guess it was probly the side gears' cage-like screw there are 2 ovem 4 each side gear that when i reassemble them i just screw them into their own threads, and the crown wheel is moved from side to side due to this preload setter. So i figured this is backlash/ clearance of the crown as well as the side gears.
-I check the thrusts of the spider gears and one of them heavily worn out into an oval shape hole nt a round hole which fit the cross bar shaft, also there is an excessive line of damage due to over load n heat=> it must be replaced. So I found the fault, rectify the reason, find the source of the problem n fix it. Afterall, resetting the preload is required.
When re-assembling, we were required to set the pinion preload using the load tester its like a bar with torque ranges and a weight on it. I then came to understand the purpose of the collapsible spacer is to press into the bearing setting pre-load when the adjusting bolt is tightened.
In the end, not only reading but actually working with the diff opens my mind literally/ visually about what can go wrong inside a diff and how to make it right.
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