[Before I drop this TT-02 chassis in the trash...]

8 hours ago, Gebbly said:

I see, thanks  I had seen some discussions on here about use of grease and there seem to be varying opinions. I settled for using grease on parts that were sealed in somewhere (like the diff housing) and not using any on exposed parts that could get dirt and grit stuck in the grease more easily. If it turns out I need to redo it all I'll just have the fun of taking it all apart and a rebuild, twice the building fun for the money

 

@JimD9999, have you had any luck fixing your problem swapping out gears, if so what turned out to be the exact problem in the end?

I was using a G2 gear instead of the GB2 gear...

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I did some research and yeah GB2 is flat on top. Thanks I will try and find them...

[Before I drop this TT-02 chassis in the trash...]

1 minute ago, Gebbly said:

If you look at the instructions on page 22, the "G parts" section, you will see a picture of a sprue with 7 parts, including 2 of part "G2". To the right of that you will see a picture of part "GB2_x2".

Could you open the diff and tell us which parts you have placed inside there? If you have placed all the gears correctly inside the diffs then a single diff should contain

1 of G1

2 of G2

4 of G3

This would not leave any spare G2 parts for the drive shaft. It suggests you have also got something wrong inside the diffs.

I think you are correct.

[Before I drop this TT-02 chassis in the trash...]

9 minutes ago, Twinfan said:

This is hard work, I thought I'd made it as clear as I could!

Crosses are the gears you've used, and they are the wrong ones.  They're called G2.

I've circled the gears you need to use.  They're called GB2.

G2 is not equal to GB2.

 

I see well I can't find any other gears. Any idea where GB2 is? There were 4 G2's  on the two trees.

I guess I have some how misplaced GB2 I will look for it.

Thanks!

[Before I drop this TT-02 chassis in the trash...]

7 minutes ago, alvinlwh said:

Agree! Open the diff, count the gears. There should be 2 x GB2 and 4 x G2. Easy way to figure out which is which.

DId that the big gear in the diff is the exact same one. FYI the small gears in the diff are G3.

 

[Before I drop this TT-02 chassis in the trash...]

10 minutes ago, Twinfan said:

It says "GB2" in your pic, this is the gear you want.  You have the wrong gear at the moment.

If the red x means "these gears" then that is what I am using. IF the red X means "not these gears" then I don't know what gear you mean.

[Before I drop this TT-02 chassis in the trash...]

8 minutes ago, alvinlwh said:

As everyone else had pointed out, the gear in your first picture looks too "flat". Compare the profile of G2 and GB2.

 

 

The all are 8mm tall.

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8 minutes ago, compass said:

That is indeed the wrong gear. This is G2 from the diff

G2 is the correct gear for there. It is the exact same gear that is in the diff.

[Before I drop this TT-02 chassis in the trash...]

4 minutes ago, compass said:

can you make a photo off the other side of that bevel gear?

 

7 minutes ago, Twinfan said:

Is it lined up correctly inside part GB3?

Yes otherwise the big gear is not flush 

[Before I drop this TT-02 chassis in the trash...]

2 minutes ago, compass said:

can you make a photo off the other side of that bevel gear?

 

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As I mentioned, the pin (dowel)  is correctly seated in the big gear,  down into the slot. The spur gear is pushed on as far as it will go.

The gears that go in the diff are much smaller and have a round hole, not the holes with flat sides that. fit onto C5 - it for sure fits on C5.

Well thanks for the input guys,

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I can't assemble it because the spur gear is blocking the diff case from fitting in, it's like part C5 is too long.

The pin is fully seated in the gear.

I've examined it over and over and it looks 100% correct.