31
Cobra.
OPERATING MANUAL
EDITION 01/2012
PART NUMBER DOC322851
6 TROUBLESHOOTING AND MAINTENANCE
6.1 ELIMINATING FAULTS
Problem Cause Remedy
The pump does not work Air motor does not work or stops Open and close ball valve on
the pressure regulator unit or
disconnect compressed air supply
shortly
No pressure indication (pressure
regulator defect)
Disconnect compressed air
supply shortly or repair or change
pressure regulator
Spray nozzle is clogged Clean nozzle as laid down in the
instructions
Insuffi cient supply of compressed
air
Check compressed air supply
Filter insert in spray gun or high-
pressure fi lter is clogged
Clean the parts and use an
appropriate spraying material
Material feed pump or high-
pressure hose are blocked
(e.g., two-component material
hardened)
Dismantle the paint pump and
clean, replace high-pressure hose
Grease in spool-sleeve
combination (air motor stops at
the stroke end)
Degrease spool-sleeve
combination, check detent body
(use service manual)
Bad spraying results See gun instructions
Irregular operation of material
feed pump: spray jet collapses
(pulsation)
Viscosity to high Dilute working material
Spraying pressure to low Increase incoming air pressure,
use smaller nozzle
Valve stuck Press knocker for inlet valve. Clear
material pump, if necessary leave
to soak in solvent
Foreign body in suction valve Dismantle suction valve housing,
clean and check valve seat
Diameter of the compressed air
line too small
Assemble a larger incoming line
->technical data, paragraph 4.3.2
Valves, packings or pistons worn Replace parts
Filter for control air or fi lter for
work air is clogged
Check fi lter and clean it
Strongly irregular operation of
material pump
Diaphragm is “blocked” when the
suction is to rapid
Operate pump some time with
minimum opened ball valve
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