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Take the cylinder/piston parts out of the mechbox, just leave the gears in.
install all the screws.
Then reach in there with your finger and try spinning the sector gear, it should make 3-6 rotations with a good spin.
If the gears do not spin freely, you could have;
-shimming issue, either gears are touching or shims are too tight
-axle misalignment
-jammed bearing
If the gears do spin freely you might have;
-sector gear may be pressing against the tappet plate, test by pushing the air nozzle back when the mechbox is together, it should move back and forth freely
-bevel gear may still be shimmed too far into the motor
-piston might be jamming in the guide rails
-spring may be too powerful for your battery (which sounds like the case)
-wrong gear ratio for your spring/motor combo
-could very well have a bad motor
SO if you're blowing out a 20A fuse, but the mechbox works with an 11.1v lipo, it means either your motor doesn't have enough torque to move the mechbox, or you have way too strong a spring on high speed gears.
so what exactly is in your mechbox? spring and gear ratio?
and what kind of motor do you have?
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