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Front and rear differential not engaging
Posted: Wed Mar 19, 2025 2:35 pm
by Paul Fowler-Smith
Good afternoon, after a pal has sorted the radio set up for me I am trying to get the model to move under its own power.
I have set this up as per the instructions (Rev 1.0), both of the diffs work fine on the bench though CP0402 needs to be encouraged to sit against CP0401. do I need to add a washer or a spring to make a better fit.
First time with these diffs, they are wonderful engineering, but... I cant get it to work. Wondering what I have missed, I have read all the builds on the forum and no one else appears to have this problem.
Re: Front and rear differential not engaging
Posted: Thu Mar 20, 2025 7:14 am
by mick whittingham
I'm.not sure what your specific problem is, your description of them not working isn't clear.
When I built my diffs they worked OK on the bench and when put on the chassis. But the front diff misbehaved after I fitted the steering servo. I had fitted springs in the joint cups and removing them made everything work fine.
I think the diffs are very sensitive to set up.and alinement. But I can't shed any light on how to go about tuning their set up.
Just make sure the UJ cups have been properly cleaned up of any machining issues like sharp edges etc that might jam up when the steering is turned under power.
Let us know how you get on.
Mick
Re: Front and rear differential not engaging
Posted: Thu Mar 20, 2025 1:57 pm
by Paul Fowler-Smith
download/file.php?mode=view&id=69331
The face of the gears appears to not mesh and stay meshed with the Diff CP0401. How do I make it work better please. I have considered putting a washer between the CP0402 and the bearing to make the CP0402 more proud/ tighter to the diff.
Re: Front and rear differential not engaging
Posted: Sat Mar 22, 2025 11:42 am
by mick whittingham
I'm not sure about shimming the bearing and pinion. It's machined so that the mesh is exact without tinkering.
Did you put too much grease in the housing? I ended up scooping a lot out when I had similar issues on the front diff. More is not always good.
As long as you have followed the build instructions exactly then everything should work fine. I suspect you are missing something obvious but hidden from view.
Are the nose caps correctly oriented, I remember the instructions being adamant about maintaining the position of each piece, so I pop marked mine before taking the sticky red dots off just to be sure.
Re: Front and rear differential not engaging
Posted: Mon Apr 07, 2025 5:42 pm
by Paul Fowler-Smith
Mick
Thank you for the advice, but I rang Kian this afternoon and swapped the ET0215's and it now works and has been on the drive. All good except tyres were only snap fit and another part not tightened enough. The joy of Armortek kits, always a learning day!
Kian
Thank you for your input today, very much appreciated.
Re: Front and rear differential not engaging
Posted: Mon Apr 07, 2025 9:43 pm
by mick whittingham
I'm glad you got it sorted out alright. Yes all model making is a learning curve, working out how to solve a particular problem.
I'm really enjoying the series 1 build so far and have made a few modifications to the base kit just to improve on detail.
I'm still some way from the finish line but feel I'm better than halfway there.
Do you have any images of your build? Are you modifying anything or building the standard kit model.
Mick