I need to replace part number 8 and 19 innthe below diagram which are bearings in the rear diff of the loading shovel. Is there a big science to set up the diff again after ripping it.
keep all the shims in their place put it together and check backlash and tooth contact pattern
The site below is very helpful, and says it all. Use Prussian Blue or gear marking compound to see the tooth contact pattern. You need to hold a bar of some kind against the ring gear to produce a level of resistance, whilst turning the pinion shaft, to be able to see a defined tooth pattern. Tooth contact point that is too high on the teeth, or too far towards either end of the teeth, will result in tooth breakage under load. Central contact point is what you aim for. Ring and Pinion Gear Setup | Tooth Contact Pattern Crawlpedia is an off-road encyclopedia featuring a detailed guide to set up ring and pinion gears with the proper gear tooth contact pettern. www.crawlpedia.com
Are those bearings tapered roller bearings?
If 8 & 19 are straight rolled bearings that seat against #7 it should just load in with the same shim pack as removed. If they're tapered rollers , well, you're in for quite a set up procedure. Why did you have to replace the bearings, and what did the ring and pinion show for wear? You might just have a bigger problem than the pinion bearings.
Yes tapered roller bearings
Bearing started to break up. Just got it in time before it completely bust up. Ring had the tiniest amount of wear at the outside edge. Pinion seems fine.
Are part number 27 shims?
Yes, 27 are shims, they may all be the same or your parts diagram may show different thicknesses. Either way, it's gonna be a rough road trying to establish pinion depth with the pig and axles installed in the machine. Just a lot of in and out and visually checking your contact pattern. I'm really hoping nothing changed and your drop-in depth us perfect. Good luck.
27 looks like shims to set pinion depth
Here is what the parts book says for 27
Would shims that tiny in thickness make a serious difference?
Is there companies who specialise in this that if the axle was taken to them they can rip it and repair it and set up everything perfect again.
Absolutely. It establishes how deep the pinion engages the ring.
Yes, of course. Reach out to your local dealer and find out who they sublet that repair to. If they are equipped to do the set up, ask what they would charge so you're not blindsided. I would not consider rebuilders of on road equipment, the gearboxes, while similar in design require a different approach. Pinion depth is the first and most critical measurement to establish. Crown wheel engagement is secondary and quite difficult with that configuration.