Cold Jet RDS 500 Cub, Parts & Maintenance Manual

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Fine tuning the tuning fork
Open the Controls enclosure on the front of the
Cub
Loosen the potentiometer shaft from the silicone
seal.
Pull the blast gun trigger; this will cause the vi-
brator motor to jump to HIGH for around 1 to 2
seconds, followed by a drop to LOW.
Once the machine is vibrating on LOW, adjust
the potentiometer shaft clockwise or counter
clockwise until the tips of the tuning fork vibrate
between ¼” and ½”.
It may be necessary to bend one of the tuning
fork tines to avoid chatter on the hopper shield.
This will be obvious because of excessive noise.
Once the vibrator motor is tuned, shut off the
blast trigger, and re-seal the potentiometer shaft
with silicone.
Disconnect the power to the machine and rein-
stall the safety screen.