Check that nothing is loose on the z-truck (including bit) and check that your z-belt is not loose.
Re-check the installation instructions of the Z-Motor Replacement just to make sure paying particular attention to this part:
2. Assemble the screws holding the Z-truck motor pack. Replace and tighten the
two screws (with lock washers) that secure the Z-truck motor pack to the Y-truck
(See Figure 12). Tighten these two screws as tight as possible by hand. Check
again and make sure that the Z-truck motor pack tensioning shoulder screw and
spring are in place and tight before tightening these screws fully with a screwdriver.
Failing to tighten these screws AFTER the Z-truck motor pack tensioning shoulder
screw is tightened will result in an incorrect belt tension. Also make sure that all
wires are clear of the area. It is possible to pinch the wires coming up from the
board sensor when this interface is tightened.
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