Align T-REX 450SA ARF Manual page 26

6.4 Viewing the model from the side, note the height of the pinion gear on the motor shaft in
relationship to the main gear. The top of the pinion gear should be set slightly (about 1/32") above
the main gear. Loosen the pinion's setscrew and adjust the pinion height as necessary until it is
correct. Then, securely tighten the setscrew.
6.5 Loosen the motor mounting screws just enough to allow adjustment of the pinion gear/main gear
mesh by moving the motor fore and aft on the motor mount. When the gear mesh is adjusted
correctly, there should be a very slight amount of play present between the gears. Once you have set
the gear mesh correctly, tighten the motor mounting screws securely.
Note: It is very important to set the gear mesh so that it is smooth with no binding.
Be certain to check the mesh at multiple points on the main gear in order to find
the position in which to secure the motor for the best gear mesh overall. Remember,
if the gear mesh is set too loose or too tight, it may strip the gear and/or cause
significant loss in power.
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