6.2 Service and Adjustment of Control Unit
Over the course of time the control unit may need to be serviced or adjusted due to
the natural wearing of the unit’s shut off tubes or from foreign material becoming
lodged in one of the shut off tubes. A routine check of the unit’s operation should be
preformed on a regular basis.
If the flow of media and air from the blast nozzle does not shut off
completely after releasing the hand lever try adjusting the control unit before
servicing.
WARNING: NEVER OPERATE OR ADJUST THE CONTROL UNIT
WITH THE CONTROL UNIT COVER OFF. SHUT OFF TUBES
ARE UNDER PRESSURE AND THE CONTROLLER SPRING IS
UNDER GREAT COMPRESSION. EXPOSED MOVING
COMPONENTS PRESENT PINCH HAZARD.
To adjust the control unit while blasting use a socket wrench with a 2” extension
and a 9/16”socket.
1. Turn the two (2) adjusting bolt heads (above and below control unit air
cylinder on back of control unit) clockwise MAKING SURE TO TURN
EACH BOLT ONE (1) TURN AND THEN THE OTHER SO AS TO
ADJUST THEM EVENLY – IT IS CRITICAL THAT THEY ARE
ADJUSTED EQUALLY – FAILURE TO ADJUST EQUALLY WILL
DAMAGE THE CONTROL UNIT.
2. After each complete revolution of the two (2) adjustment bolts, test to see if
the blast nozzle shuts off completely.
3. If after repeated tightening the media and air flow, at the blast nozzle, will
not shut off completely, or the control unit is adjusted so tight as to totally
stop the flow of air and media the unit will need to be serviced.
