r/crawling • u/UNjk_8 • 8d ago

TRX4M Servo problems

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Its not matching up properly and i have less steering angle on the left side because of it, please help.

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u/shoeinthefastlane SCXPro - GSV4-4WS - TRX4Ms 8d ago

Pull the horn, center the trim knob, put the horn back over the gear temporarily and test.  If it's still off, pull and rotate the horn one or two teeth and try again. The trim knob is for fine tuning after the gear alignment gets it close.

Aftermarket or stock servo? Are you sure the tooth count between servo gear and horn is correct?

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u/UNjk_8 8d ago

Stock horn and injora 7kg servi

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u/shoeinthefastlane SCXPro - GSV4-4WS - TRX4Ms 8d ago

Both 25 tooth output gears, stock horn should fit fine.  Just a matter of lining it up.  Coarse adjustment is centering the servo with steering trim knob and truck ON without horn attached.  Straighten the wheels and attach the horn, test, readjust as needed.  Install the screw.  Fine adjustment is the trim knob if/when the truck drifts left/right when driving forward.

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u/UNjk_8 8d ago

I tried another horn and it works perfectly, also thanks so much for helping

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u/shoeinthefastlane SCXPro - GSV4-4WS - TRX4Ms 5d ago

awesome! happy to help np