Schmidt AmphiBlast 120, Operation And Maintenance Manual

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Copyright © 2019 Axxiom Manufacturing, Inc.
11.2 Malfunction With Deadman Lever in the “On” Position
11.2.1. Air blasts with no abrasive
(1) Check abrasive level in blast vessel (even if other outlets blasts normally).
(2) Blocked control air hose to Thompson® Valve (#14) prevents opening.
(3) Thompson Valve (#14) plunger stuck in closed position.
(4) Trash plugging opening from tank to Thompson Valve (#14). See Section 11.3.
(5) Insufficient air pressure to open Thompson Valve (fully open requires 80 psig).
(6) Abrasive flow problems. See Section 11.3.
(7) Defective Thompson Valve piston seal (air will leak from breather).
(8) Blast vessel leak (closure or manway) reduces pressure slowing abrasive flow.
(9) Control valve (#64) stuck in exhaust position or midway (air will leak from breather #35).
(10) Defective abrasive cutoff valve or switch (#62).
(11) Thompson Valve (#14) outlet clogged with wet abrasive because full fort threaded coupling (#27) is
not installed on outlet of injection module (#32). See Section 5.24.
11.2.2. Abrasive choking out of blast hose with low blast air pressure
(1) Thompson Valve (#14) abrasive adjustment knob is open too far.
(2) Control air hose to automatic air valve (#9) blocked, pinched, or leaking prevents opening.
(3) Choke valve (#13) is partially closed causes differential pressure increases abrasive flow.
(4) Low air compressor output cfm (unit may cycle on and off). See Section 3.0.
(5) Blocked automatic air valve (#9) breather vent (#21) prevents full opening.
(6) Control valve (#20) stuck in exhaust position or midway (air will leak from breather #35).
11.2.3. Reduced Pressure at The Nozzle (with or without abrasive flow)
(1) Low air compressor output CFM. See Section 3.0 to determine air requirements.
(2) Air supply hose to blaster is too small. See Section 3.0.
(3)
Thompson Valve abrasive adjustment knob (#14) is open too far.
(4) Check for leaks in blast vessel (closure or manway) or control piping.
(5) Choke valve (#13) is partially closed.
(6) Trash may be partially plugging the nozzle orifice (#11).
(7) Blocked automatic air valve (#9) breather vent (#21) prevents full opening.
11.2.4. Blast is slow to turn on or will not turn on when deadman lever is pressed down.
(1) Check quick couplings (#16, #17 & #42) on control hoses to see if they are connected properly.
(2) Control valves (#20 & #64) stuck in exhaust position or midway (air will leak from breather #35).
(3) 1/2" air filter (#23) blocked; restricts air flow to deadman.
(4) Twinline control hoses (#15) are blocked.
(5) Cartridge in deadman valve (#12) is blocked.
(6) Low air compressor output CFM (unit may cycle on and off). See Section 3.0.
(7) Air leaks in twinline hose (#15) from the deadman valve (#12) to control valves (#20 & #64).
(8) Trash blocking the blast nozzle orifice (#11).
(9) Blocked automatic air valve (#9) breather vent (#21) prevents full opening.
11.2.5. Air and abrasive blasts with no or inconsistent water
(1) Water differential pressure (#51) is too low.
(2) Low water level in water tank (pump will cycle continuously).
(3) Water tank outlet ball valve is closed (pump will cycle continuously).
(4) Hose from water tank to water pump (#58) is blocked (pump will cycle continuously).
(5) Y-strainer (#59) screen is clogged (pump will cycle continuously).
(6) Air supply hose to water pump (#58) is blocked (pump will not be cycling).
(7) Water shut-off valve (#52) is stuck in “OFF” position.
(8)
Water pump malfunction. Refer manufacturer’s manual troubleshoot in Section 14.0.
(9) Insufficient air supply to unit (inconsistent water). See Section 5.19.