Do a ratio check to determine both flow and ratio.

1. Do a ratio check at the outlet of gun with mixer removed.
   • Check to see if there is flow from both pumps.
   • Check to see if the pump outlet valve is cutting off material and also that it is not sucking air in the return stroke.
   • Check phasing. Is one material flowing before the other?
   • Measure volume output of each material.
   • Check the rod metering pressure seal to make sure it is working properly.
2. Procedure for checking pressure seals and check valves.
   • Remove material hose from one side of applicator.
   • Reduce air pressure at regulator to 15 psi.
   • Hold hose over waste container.
   • Depress silver button on applicator with finger. DO NOT MOVE LEVER.
   • Pump will now move forward and pressure will rise on the side with hose still connected. Material will flow from the hose that is disconnected.
   • The pump will stall against pressure if the pressure seal is properly holding.
     *NOTE: Some materials may have air in them, which will allow pump to continue moving. If after 2 or 3 strokes pump does not stall against pressure and hold for 5-10 seconds, the pressure seal must be replaced.
   • To check the opposite side, reverse the hoses and repeat steps 3 thru 6.
   • Verify that outlet check valves are sealing. Observe check valves at the end of steps 6 and 7 above before opening the ball valves. The pressure should remain near its peak point for a half-minute or so.
     *NOTE: If ratio and the seals and check valves test okay, the problem is in the line or applicator, and not at the meter.
3. If ratio check is not correct, the problem is in the meter.
   1. Supply blockage or low material.
   2. Pump worn out or seal worn.
   3. Outlet check valve not sealing.
   4. Rod worn.