There is a "Dump Valve" that is stuck or has trash in it. Follow the small tube from the pump to the white plastic valve that looks kinda triangular with 3 screws. Remove the screw carefully as this is spring loaded. There should be a black rubber piece that is a seal. Pay attention to how it assembles. The spring presses the seal against an opening. Look for something that may be allowing this not to seat.
SOURCE: Hoshizaki Flaker Gear Motor Part
I expereinced the same problem and the only solution I could come up with was to have the gear fabricated. I made a few fro backup. I haven't used any in the two years since i fixed mine. I can sell you a replacement gear or you can send me the gear box and I will install the new gear for you. This same gear box is used in a number of Hoshizaki flakers. Typically symptoms are noisy gear box and jerky auger, or motor spinning but no Auger rotation. Cause is typically scaling/ calcium build up in the evaporator tube. The extra torque stips the gear.
Call me if I can help James 580 799 2873
Check condenser coil which is the coil on back with fins, sometimes with metal.mesh filter. If dirty or clogged up clean filter, blow out with air or brush and rinse out, careful not to bend fins. Sounds like issue to me. Unless the dump valve may be leaking by
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