Komatsu PC400LC-5 Operation & Maintenance Manual page 226

28.1.2 ADJUST THE BELT LENGTH
To shorten the blet
Pull the free end of the belt on either the buckle body or tongue
side.
AE078090
To lengthen the belt
Pull the belt while holding it at a right angle to buckle or tongue.
Inspect bolts and fittings on the chassis for tightness. Retighten any
loose bolts to 20 - 29 Nm (2 - 3 kgm, 15 - 20 Ibft) torque.
If the seat is scratched or frayed or if any of the fittings are broken
or deformed from long service, replace the seat belt immediately.
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AE078100
5-6