Its unlikely that you broke anything unless you used an axe to tighten the bolts
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There are three main controls, the traction ( wheel) system clutch, the auger/impeller clutch and the speed ( gear) control. Its not really a gear shift but everyone seems to call it that. Of the three controls the two clutch controls normally have a cable to connect them to the levers coming out of the lower end of the blower. The gear shift normally has a series of rods connecting it.
The two cables have an "S" shaped end on them that fits into a hole on the lever connected to the lever that you use to control the clutches. The other end has a threaded rod/nut/hook assembly that connects to the levers coming out of the the traction system housing ( where the wheels are). Too hook the "S" ends through the holes you manually move the levers to slacken the tension on the cable, twist the "S" and feed the end through the hole, let the tension back onto the cable. The manual should explain how to adjust the bolt on the other end to get the correct tension.
