The First Years 630 - Manual (Page 40)

Section 7 - Installation and Use
7.12 Adjusting Harness Tension
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To Tighten Harness System Tension
 Pull on the harness tension adjuster to tighten harness
straps.
Tension Tip!
A snug strap should not allow any slack. It lies in a
relatively straight line with out sagging. It does not
press on to the child’s flesh or push the child’s body
into an unnatural position.
To Loosen Harness System Tension
 Lift the metal tab and  gently pull on the harness
strap over the child’s shoulder.