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6
How to Adjust an Acoustic Guitar Truss Rod
Your truss rod needs adjustment when the neck of your guitar has too
much or too little upbow or too much backbow.
Tightening or loosening the adjustment nut adds or lessens pressure on
the rod and neck. As a general rule, tightening the nut moves the neck
away from the string pull and removes upbow; loosening the nut allows
the neck to relax into an upbow again (especially when helped by the
strings’ pull). Controlled upbow is known as relief.
However, with a one-way truss rod, if the neck warps away from the
string pull, no amount of loosening the truss rod will pull the neck
straight, because the truss rod only works against the pull of the strings.
Two primary signs tell you that your truss rod needs adjusting:
1. There’s a noticeable change in the action; the height of the strings
over the frets has become either too high or too low.
The most common scenario is that the strings get higher as the neck
upbows from the string pull.
2. Some strings buzz on the frets between the nut and the fth fret.
This indicates that the neck is either too straight or it is backbowed
from the truss rod’s slow, constant pressure over time.
Wrench
Adjustment Nut
Loosen for “hump”
Tighten for “bow”
ADJUSTMENT NUT
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