JCB 3C MkII torque converter problem

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Joined: Sun Jun 26, 2022 6:43 pm

JCB 3C MkII torque converter problem

Post by Rom »

Hello, I'm looking for help with a 1975 jcb 3c mk2.
It's the model with torque converter and front/rear shuttle

When I select the forward gear, everything is fine, nothing special.

When I select the reverse gear, the start is brutal, there is a big "klonk", and then the machine starts to move.

If I operate the lever very gradually, I manage to eliminate this "klonk".

I checked the modulating valve, it works correctly.

I think that there is an excessive "gap" somewhere, maybe in the rear clutch, but I don't understand what can produce this noise......

Do you have an idea?

Thanks in advance.

PS: sorry for my bad english, I'm french.

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