Ryobi 3302H Operation Manual page 186

Chapter 2 Periodic Inspection
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<Adjustment procedures>
(C)
Maintenance Edition - 20
Push the water roller crawl button.
Crawl the metering roller and check the nip width that appears on
the metering roller.
Turn the adjustment bolts (C) to adjust the pressure.
The adjustment bolts are located on both the operation and non operation
sides. When turning them in the"+" direction (counterclockwise), the
pressure will be increased.