WAGNER Unica 4-270 Translation Of The Original Operating Manual page 31

EDITION 09 /2015
OPERATING MANUAL
Troubleshooting and solution
Problem
Irregular working
cycle of the pump; in
painting applications
the material jet
collapses (pulsation)
The pump doesn't
work (pneumatic
motor stall)
IMPORTANT:
In all cases where pump parts or pressurized pipes need to be disassembled, follow the
pressure release procedure as described in Paragraph 5.2.2 before performing maintenan-
ce.
PART NO. ZZB028ENG
Cause
• Excessive material viscosity
• Spraying pressure too low
• Product valves clogged
• Foreign body in the suction
valves
• Insuffi cient diameter of
compressed air supply hose
• Worn valves, seals or diaphragms
• Obstructed control air fi lter or
working air fi lter.
• Insuffi cient diameter of
compressed air feeding hose
• Piloting system air supply hose
wrongly assembled after the
pump air pressure regulator
• Reversing valve blocked or
damaged
• Insuffi cient piloting pressure
Unica 4-270 N
Solution
• Dilute working material
• Increase air inlet pressure, without ever
exceeding the max. allowable value. Use
smaller nozzle.
• Clean pump fl uid section, if necessary let
the detergent act inside it for some time.
• Remove the foreign bodies in the suction
valves, clean and check the valve seats.
• Mount a pneumatic supply hose with
larger diameter -> technical data,
paragraph 4.3.2
• Replace the worn components
• Check fi lters and if necessary clean them
• Push the anti-stall rod to unblock the
pneumatic motor. Use a pneumatic
feeding hose having a larger diameter. ->
Paragraph 4.3.2. "Technical data"
• Push the anti-stall rod to unblock the
pneumatic motor. Assemble the piloting
system air supply hose before the pump
pressure regulator -> Paragraph 5.1.3.
"Compressed air supply air"
• Check the reversing valve and replace it,
if necessary
• Check the compressed air feeding line
and increase it, if necessary -> Paragraph
4.3.2. "Technical data"
.
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