31
Phasing the Pumps
1. From the SHOT FLOW screen do the Material Pump Servo Start Up Sequence
(if Required)
, select the
RETRACT button.
2. Open the ratio check ball valves and close the material hose ball valves.
3. Press the HOME button.
4. The pumps are in phase when the material begins to flow from the ratio check nozzle outlets at exactly
the same time.
5. Readjust the HOME position switch as required,
see Adjusting the Limit Switch section of this manual
for more information.
When the machine begins pumping material, both pistons must enter the metering
tubes at precisely the same time so that both materials start flowing simultaneously.
This will ensure proper mixing and a very repeatable metered ratio.
Follow these instructions at initial start-up and after a pump repair.
Before proceeding, if your model is equipped with ratio check
ball valves, first close the material hose ball valves and then
open the ratio check ball valves.
If the material from the A pump flows before the material from the B pump, loosen the jam nut
and set screw. Then rotate the shaft of the B piston
counterclockwise
a quarter turn with an
open end wrench positioned on the wrench flats. Cycle the machine again and, as before, sight
across both outlet ports. Repeat until both materials flow simultaneously.
If the material in the B pump begins to flow before the material in the A pump
(overcompensation), rotate the shaft of the B piston
clockwise
in quarter-turn increments until
both materials flow simultaneously.
Always retighten the jam nuts and set screws, securing both pump shafts in the phased position.
(see the Illustration next page)
