Troubleshooting And Maintenance; Eliminating Faults - WAGNER Cobra 40-10 Operating Manual

EDITION 01/2012
OPERATING MANUAL
6

TROUBLESHOOTING AND MAINTENANCE

6.1

ELIMINATING FAULTS

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