ISMardKB Posted August 16, 2022 Share Posted August 16, 2022 (edited) One of my bearings is shot and I need to replace it. Got a new one but how do I remove and replace it? Do I remove the 4 hex bolts that hold the large gear in place? I think it might be the spider diff as it’s the pro model. Edited August 16, 2022 by ISMardKB Wrong word Quote Link to comment Share on other sites More sharing options...
locky Posted August 16, 2022 Share Posted August 16, 2022 Remove 4x top screw and the top half of the mount should come out, you may need to remove the brake linkage. Quote Link to comment Share on other sites More sharing options...
ISMardKB Posted August 18, 2022 Author Share Posted August 18, 2022 Thanks Locky, done that and got the diff out but looks like the ends need to be removed before the bearings come off. Does that sound right? If so do I have to completely strip the diff? Quote Link to comment Share on other sites More sharing options...
locky Posted August 18, 2022 Share Posted August 18, 2022 Yes the diff needs to be apart to replace the bearings. If it is a spider diff then it is a pain as there are holes in the bottom case which allows any internal oil to come out when the retaining screws are removed. There is a one piece plastic tool to plug all these holes but I just use pieces of wooden cocktail sticks to plug the holes. You will need to refill with diff oil. Quote Link to comment Share on other sites More sharing options...
ISMardKB Posted August 21, 2022 Author Share Posted August 21, 2022 The centre diff isn’t a spider diff after all but the f+r are. Awaiting diff fluid to refill centre one but haven’t taken the f+r apart yet. When I took the rear diff out of the box there was a lot of metal swarf around and the bevel pinion had been scraping the spider casing. The bearing with the red arrow in my pic was missing! Why would that be? Quote Link to comment Share on other sites More sharing options...
locky Posted August 21, 2022 Share Posted August 21, 2022 The drive pinion gear will not be held true without both bearings, so looks like it was rubbing against the diff case. Put the diff in and check that there is no play side to side and also the drive pinion gear doesnt move in and out. Hyper diffs dont normally need shimming. Rotate the diff to check how the mesh feels between he two gears. If the teeth look good and mesh feels good then your good to go. That's why it is always useful to tear down a new used car as there can be hidden faults. Quote Link to comment Share on other sites More sharing options...
ISMardKB Posted August 23, 2022 Author Share Posted August 23, 2022 Will do Locky. Ty. The Surpass motor and ESC arrived today, it has twin connectors. Can I just use one connector and leave the other as is or will it need something doing to it? Bypassing somehow? Also going back to the diffs, do the internal gears need grease on them? I have normal LM grease, white lithium grease and a”food grade” silicone grease intended for homebrew O-ring beer connections. which if any would be best? Quote Link to comment Share on other sites More sharing options...
locky Posted August 23, 2022 Share Posted August 23, 2022 If using one esc battery connector then the other one needs a loop connector, just find one with same style plug...https://www.ebay.co.uk/sch/2562/i.html?_from=R40&_nkw=loop+connector&LH_TitleDesc=0&_sop=10 Diff should have grease or silicone oil. Grease will do if at hand for garden bashing. Silicone oil allows some tuning so racers swap diffs according to track conditions, centre diff oil is usually much thicker than front/rear . Quote Link to comment Share on other sites More sharing options...
ISMardKB Posted August 23, 2022 Author Share Posted August 23, 2022 Brilliant. Many thanks. Got the centre one filled with 60k and will employ the cocktail stick trick on the others when I can 🙂 Quote Link to comment Share on other sites More sharing options...
ISMardKB Posted September 4, 2022 Author Share Posted September 4, 2022 Quick update, all up and running on 3S, definitely feels fast enough 🙂 Quote Link to comment Share on other sites More sharing options...
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