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FOR GB1064 MACHINES BUILT BEFORE 607945
WATER FILL ADJUSTMENT INSTRUCTIONS
Note: This applies only for GB1064 machines with serial numbers before 607945.
Machines built after 607945 have an upgraded water valve which equalizes the amount of
water in each tank per load.
Since supply pressures vary between the factory and install locations, water fill levels between the
top and bottom water tanks will also vary. The water fill difference between the upper and lower
water tanks should be less than 1/8 in (3 mm). A dynamic water pressure of 30 psig (0.2 MPa)
minimum is required to ensure consistent water fill performance. Before adjusting the water fill
levels be sure that the Water Level Probes are properly adjusted and no hoses are kinked. Refer
to the Service Manual for the adjustment specifications according to cube size.
To Adjust For Equal Fill:
1. Place the selector in the “CLEAN” mode, switch the Power Switch to “ON”.
2. Pull down on the right side of either water plate, stretching the springs until the actuator motors
rotate the cam arms counter-clockwise. Observe that the cam arms continue to turn, opening
the water plates fully, dumping the water in the tanks. It may be necessary to turn the power off
with the water plates fully open in order to completely drain the water tanks. At this point, the
cam arm rotation will reverse and close the water plates. The cam arm rotation will stop when
the water plates are fully closed and the water fill will occur. When the fill water reaches the
“high-level probe” the water fill valve is de-energized and the water fill stops. A small amount of
water will drain back from the water fill tubing to the lower water tank.
3. Compare the water levels in the probe tube and the upper section control stream overflow as
seen on the next page to determine if the upper and lower water tanks are filling within the
specified maximum difference
4. If the top tank level is lower than the bottom tank level by more than ⅛ inch (3 mm) for “C”
models and ¼ inch (6 mm) for “HK” models, squeeze the restrictor clamp to reduce the bottom
tank fill rate. If the top tank level is more than ⅛ inch (3 mm) for “C” models and ¼ inch (6 mm)
for “HK” models 1/8” higher than the lower tank level, open the restrictor clamp to increase the
lower tank fill rate. Small adjustments are recommended. When the adjustment appears to be
correct, dump the water by pulling down on a water plate, as above, allow the water tanks to fill
again and re-check the levels.
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