23
The mix pump has been preset at the factory to produce
a product with approximately 40% overrun. Because of
differences in mix formulation, temperatures and baro-
metric pressure, this fi gure may vary. It will be necessary
for approximately 2 gallons of mix to be pumped through
the machine before overrun changes in the product are
noticeable.
Overrun is controlled by the length of the air compressor
piston stroke within the piston cylinder. Lengthening the
stroke within the cylinder will increase overrun. Conversely,
shortening the stroke will decrease overrun. To perform
an overrun adjustment, refer to the following procedure:
A.
Turn the mix pump switch to the OFF position.
Disconnect power sources/circuit breakers.
B.
Remove the back panel from the machine.
C.
On the air compressor side of the pump, locate
the long/slender piston rocking arm. The rocking
arm downward travel is limited by a stationery
cam. On the face of the cam there is an overrun
setting indicator plate numbered 3 through 8 and
an adjustment knob (Fig. 4-3).
D.
The overrun setting is indicated by a pin.
E.
To adjust overrun, loosen the allen-head screw
(located within the center of the adjustment knob)
with the 5/32” allen wrench provided. Rotate the
adjustment knob counterclockwise to a higher
number for higher overrun, or clockwise to a lower
number for lower overrun. Each number multiplied
by 10 represents the overrun percentage (i.e.
setting 4 = 40% overrun).
F.
Tighten the allen screw, then place the wrench
back in its clip. Replace the lower back panel and
secure with the four screws. Turn the mix pump
power switch to the ON position.
4.10
MIX PUMP HOSE REPOSITION
Mix pump hose must be repositioned every 800 gallons
of mix pumped or every 2 weeks. Failure to reposition
the hose will result in reduced mix pump liquid capacity,
dispense stoppage, popping, and possible mix pump hose
leakage. Follow the steps below to reposition the hose:
A.
Run cleaning solution through pump.
B.
Turn the pump off and relieve any pressure by
opening the spigot.
C.
Grasp the pickup hose end of the mix pump hose
with one hand and turn the pump on. Pull down
on the pickup hose end until 12 to 14 inches of
tubing has fed through the pump then turn the
pump off (Fig. 4-4).
D.
Loosen the small clamp at the pick-up hose
adapter and disconnect the mix pump hose.
E.
Cut 7-1/2 inches off the end of the mix pump
hose.
F.
Reconnect the mix pump hose to the adapter.
G.
Continue normal operation. Mix hose will
automatically reposition itself with the adapter
near the black cover.
NOTE
Each hose is long enough for 3 repositions before
replacement is required.
Figure 4-4 Pump Hose Reposition
Pickup
End
12” to 14”
WARNING
Hazardous voltage
The Clean/Off/Serve and the Main Freezer Power
Off/On switches must be placed in the OFF posi-
tion when disassembling for servicing. The freezer
must be disconnected from electrical supply before
removing any access panel. Failure to disconnect
power before servicing could result in death or
serious injury.
Figure 4-3 Overrun Adjustment
Overrun
Adjustment
Knob
