No abrasive flows from the nozzle during blast mode.

  • Close the abrasive ball valve.
  • Turn the selector valve to RINSE.
  • Open the dump valve slowly to relieve the water pressure in the pot.
    • Be prepared to capture the water that will be drained from the pot.  All disposals must comply with national, state and local regulations.
  • After all of the pressure in the pot has been relieved, engage the pop-up pun by compressing the spring and turned the handle 90 degrees to hold the pop-up in the open position.
  • Add the abrasive (minimum four bags, maximum ten 50lb (23kg) bags of high-mass abrasive or eight 50lb (23 kg) bags of low-mass abrasive) and continue the setup procedures.
    • More water may need to be drained from the pot to allow additional abrasive to be added.
  • See setup procedure in manual.
  • Make sure the pot pressure is properly set.
  • The pot pressure must be set 30 psi (2 bar, 0.2 MPa) above the blast pressure.
  • Make sure the selector valve is set to BLAST.
  • The abrasive ball valve must be open.
  • The abrasive metering valve must be at least 1/8 turn open.
  • Operate the unit in WASH until all abrasive clears from the blast hose.
  • Close the abrasive ball valve, then turn the selector valve to RINSE.  Blast until the hose is clear of all abrasive and water.
  • Disconnect the quick coupling at the abrasive ball valve (not at the bottom of the pot).
  • Turn the selector valve to WASH.  Remain in WASH until all debris is clear.  Remove the grommet in the quick coupler.
  • Make sure nothing is in the path of the open quick coupler, then engage the blast control switch briefly and several times.
    • High flow air should escape though the cam-lock coupling.  If this does not occur, the diaphragm valve is malfunctioning.  replace entire diaphragm canister.
  • Hold the male end of the quick coupler up to the water coming from the cam-lock end of the coupler.  Clean off any dirt or abrasive.
  • Turn the selector valve to RINSE to stop the flow of water.
  • Re-insert the grommet into its internal groove inside the cam-lock.
  • Reconnect the quick coupler.  If properly cleaned and connected, there should be no leaks at the coupler during operation.
  • Perform the pressure relief procedure in the manual.
  • Apply more than 80 psi (5.5 bar, 0.55 MPa) air pressure to the regulator inlet to cause the piston to retract.
  • Loosen all 4 Allen-head cap-bolts evenly and then remove them completely while supporting the canister of the diaphragm valve.
    • DO NOT disassemble the canister.
  • Replace the diaphragm (natural rubber compound) and hand-tighten it (only as far as necessary) to establish the alignment with the canister.
    • There are one or two shims between the diaphragm and the actuator.  Keep the shims and reuse them (they do not come with the replacement diaphragm).  Do not cause any pre-load or torque on the diaphragm by over-tightening it in a misaligned position.
  • Insert all 4 Allen-head cap-bolts and hand-tighten.
  • Tighten the cap-bolts in an alternating pattern (Top Left, Bottom Right, Top Right, Bottom Left) to 80 in/lb (9 N*m).  This will cause a slight bulge in the diaphragm between the canister and the stainless steel casting.
  • Relieve the pressure applied in step 2.
  • Test and confirm that the unit is working properly.
    • This can be done using only water to charge the equipment, there is no need to use abrasive for this test.
  • Make sure the ball valve is closed, then disconnect the cam-lock coupler.
  • Open the abrasive ball valve slightly and make sure abrasive is flowing from the abrasive hose.  
  • If not follow the shut down procedure in the manual.  Thoroughly flush the pot and media hose after draining media and water.