17
FAULT FINDING
SYMPTOM
POSSIBLE PROBLEM
REMEDY
Reduced Pressure
at the Nozzle
(with or without
abrasive flow)
Undersized air compressor (see air
requirements chart)
Use a larger compressor or a smaller
nozzle
Air hose is too small
The air hose diameter should be at
least 3 times the nozzle diameter.
Abrasive adjustment open too far
Start off with no abrasive (fully closed)
then open slowly, whilst observing
air stream existing the nozzle, until a
slight color change can be seen
Pop-up not seating properly
Check valve and “O”-ring seat
Choke valve partially closed
Open fully
Nozzle is worn
Inspect and replace
Unit is Slow to
Turn On or Will
Not Turn On
The control valve is faulty
Inspect for dirt jamming the internal
shuttle valve
Control hoses are leaking
Check and repair
Control hoses are plugged or kinked
Repair as necessary
Breather vents clogged
Inspect and replace
