KT 2019 #29

[Michael Allen]

Hi Derek

Thanks for this - I will certainly check it yesterday but I’m fairly sure I matched up the dimples when assembling the sprockets . I’ll drop you a note tomorrow.

Appreciate your thoughts

Mick

[Jerry Carducci]

Hi Derek

Thanks for this - I will certainly check it yesterday but I’m fairly sure I matched up the dimples when assembling the sprockets . I’ll drop you a note tomorrow.

Appreciate your thoughts

Mick

I'm sure you've already done the fundamentals however just for completeness I would check:

• make certain the sprockets are running true; simple to test, just run the model without tracks mounted and observe the sprocket's rotation. better if you can set up an object near as a reference point

• ensure the spacing between the sprocket rings is consistent and spaced to engage the track sprocket holes exactly

I realize there shouldn't be any differences in the above attributes as the parts are generally very consistent but anything is possible. Sprockets should have zero 'wobble' when running if mounted correctly but by this time I've seen just about everything.
Also the shaft on which the sprocket runs must be absolutely true. Also the alignment of the sprocket must be parallel to the center-line of the running gear and hull side; in the same vein ensure all of your road wheels are aligned properly- it doesn't take much for the road wheels to cause the tracks to jump. A loose track doesn't help- it accentuates other problems.

It's clear that something is interfering with the smooth accurate running of your tracks; there's only so many possibilities.

Ensure that there are no screws or any parts mounted incorrectly so that they might interfere with the track's running. The track under a load is a completely different environment versus running with the model raised. Even if you were able to remove a link pair the track would likely still run irregularly and you'd likely hear it 'catch' briefly before the track settled onto a sprocket tooth.

You will find the cause

[Michael Allen]

Jerry

I’ll go through your note and check everything again later today. I have already replaced both sprocket shafts with AM supplied shafts. I think I will swop the LHS and RHS sprockets over to see if the issue swops sides.

I cannot understand why the track on one side looks to be so much looser than the track on the other but I’ll keep working through it.

I’m very grateful for your kind assistance

Mick

[Tim Carr]

Being a new KT owner, I've been following this thread with great interest.

Good Luck with everything.

Later Tim

[Michael Allen]

Hi Tim


Yep - this is very confusing indeed.

I just cannot work out what I have done wrong.

Kian has advised me to take a track link out but despite my very best efforts I am unable to get the track back together despite having two g clamps persuading it. Even if I was to manage to get the pin in I have my doubts as how much damage this might do to the bearings. I have referred it back to Kian for his guidance.

Dependant on Kians response the only thing I can think of is to check the sprockets , but I’m pretty sure they are ok, and to swop the sprocket from the LHS to the RHS to see if the problem moves with it.

IMG_7494.jpeg (94.74 KiB) Viewed 2129 times

IMG_7495.jpeg (161.66 KiB) Viewed 2129 times

What do you think?


Regards

Mick

[Peter Quambusch]

Hi Tim


Yep - this is very confusing indeed.

I just cannot work out what I have done wrong.

Kian has advised me to take a track link out but despite my very best efforts I am unable to get the track back together despite having two g clamps persuading it. Even if I was to manage to get the pin in I have my doubts as how much damage this might do to the bearings. I have referred it back to Kian for his guidance.

Dependant on Kians response the only thing I can think of is to check the sprockets , but I’m pretty sure they are ok, and to swop the sprocket from the LHS to the RHS to see if the problem moves with it.IMG_7494.jpegIMG_7495.jpeg

What do you think?


Regards

Mick

Hi Mick, From running a KT for over 10 years now with no track issues, I can say that the track tension on your pic is way too much. The higher the tdnsion, the more likely the tendency to throw the track. I run mine with the tracks resting on the wheels up to the third one, seen from the front.... If it helps, I will be over in the UK end of June. I could bring a complete setof run in tracks with me and you could try them.. Let me know what you think.

Cheers

Peter

[Michael Allen]

This is what it looks like with track set not removed but it jumps right off the sprocket within a few feet of driving.

Thanks for the offer - I’ll drop you a note if I can’t sort it

Mick

[Peter Quambusch]

Hi Mick,

Sounds good. When you take the track off and Layout it out straight on the ground, does it run straight, or is it curved?

Peter

[Adrian Harris]

Whereabouts are you in Essex ? I'll be heading to Braintree in the next couple of weeks.

Adrian.

[Michael Allen]

Peter, they both lay absolutely flat.

Adrian, I live at westcliff on sea, about 50 mins from Braintree?

Mick

[Michael Allen]

I am aiming to go to open day but the track won’t stay on long enough to get the tank into any vehicle, so it won’t make it

[Will Roberts]

Hello Michael,

If you are able to get the tank in a vehicle by just rolling it on its wheels or just bring the tracks to the open day. All being well I will have my KT there and I could compare track lengths and see if they fit mine and I might even be able to run my tank on them. That would at least prove that the tracks are not the issue and would also allow me to compare the length to the other KT tracks I have looked at. I will measure my tracks before I fit them again.

Kind regards,

Will.

[Michael Allen]

Will

Many thanks for your kind offer.

I think I will wait Kians advices and then take the tracks off, measure them and advise you of the outcome and then I will transfer the two sprockets over and see if the issue has moved with them. Probably won’t get to play tanks until Friday.

Huge thanks to you all

Mick

[Chang]

Hi Michael,

Read through this thread back and forth a few times , found that the gap distance between hull and inner sprocket had been quoted as 20mm or even 21~22mm on your and/or other builders' KT /JT.

The gap distance on my 2009 KT (now with Liam) and 2019 (2020?) JT , according the building manual , is always 19mm.

Is there such an increasing of gap distance in newer batch that I have missed?

If not , try reduce it to 19mm. Maybe it helps a bit. Good luck.

Best regards,
Lerh Chang

[Michael Allen]

Derek

Re: yours dated 03/25

The sprocket rings themselves look fine, both sets of dimples line up and all the teeth are in line. The sprocket wheels are another issue which I will go into later.


Jerry

Re: yours dated 03/36

The LHS sprocket wheel certainly is not running very true. I have already replaced both sprocket shafts. The RHS sprocket is not absolutely perfect but it is certainly a lot better than the one on the LHS. I have a brief video but cannot post it on this forum. I have sent the video by email to Kian and look forward to his valued views. One more thing of interest regards the sprockets is the paint being removed from them through bench running. The RHS (good side) pretty much has all the paint removed from the teeth on both sides of the wheel. The LHS (problem side) has all the paint removed from the outside teeth whilst the internal teeth are largely untouched!
The road wheels look OK - not totally perfect - but not more than 1mm/2mm difference. I am able to run a metal rule easily through the gaps with no issues at all but I do intend to revisit them all over the weekend as I’m keen to get this sorted.
No screws or other parts look to be incorrect.
On Kians advice I have tried very hard to take one link set out but the track just will not close up sufficiently to put the pin back even with 2 g clamps trying to persuade it.
I intend to put the missing link back, re visit the wheel alignment, swop the two sprocket wheels over, reinstall the tracks, keep all the weight off the hull and run the tank. Unfortunately the weather has prevented me doing this for the last few days and doesn’t look great for the weekend.


Will

re: yours dated 03/26

Many thanks.

I will continue to try and solve this but if I continue to fail then I will drop you a note and perhaps take you up on your kind offer.



A big thanks to you all for your kind advice. Without this forum KT 29 would never get up and running.

Happy Holiday weekend to you all

Mick