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Hi Pete
It sounds like you have the cover off the drives.
Unmesh one of the drive motors from its worm and turn it with you fingers. It should move quite freely.
Check the worm and make sure this turns quite freely with no backlash.
Put the motor back and adjust the meshing while turning the motor with your fingers.
Close up the mesh until there is no backlash without any noticeable extra loading.
Do the same with the other gear.
The way you speak I think you will find one of the motors or its corresponding worm binding. If this is the case I think the motor will be OK but the worm is probably too tight and will need to be checked for dirt or lubrication or possible incorrect assembly.
Barry
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