Vollrath O431RC - Manual (Page 26)

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A. Turn the mix pump switch to the OFF position.
Disconnect power sources/circuit breakers.
B. Remove the lower front 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. 4-2).
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.
4.9 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. 4-3).
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.
4.10 MIX PUMP HOSE REPLACEMENT
Mix pump hose must be replaced when tubing cannot be
further repositioned (every four to eight weeks). Failure to
comply will result in hose failure and possible pump
damage. Follow the steps below to replace the hose:
A. Run cleaning solution through pump.
B. Turn the pump off and relieve any pressure by
opening the spigot.
C. Disconnect the mix pump hose at each end.
D. Grasp the discharge hose end with one hand and
turn the pump on. Pull down on the hose until all
of the remaining hose is removed from the pump.
Turn pump off.
E. Rotate pump roller assembly so one roller is at the
6:00 position.
F. Use a brush that fits in the opening and clean the
pump roller assembly, first with detergent water
and then clear water.
Figure 4-2 Overrun Adjustment
Figure 4-3 Pump Hose Reposition
Pickup
End
12” to 14”