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VERSION 12/2018
9
TROUBLESHOOTING AND RECTIFICATION
Functional fault
Insufficient product output
Poor spray pattern
Valve rod leaks
Spray gun will not shut off
correctly - "dripping"
ORDER NUMBER DOC 350941
Cause
Nozzle too small
Product pressure too
low
Nozzle is clogged
High pressure filter at
pump clogged
Damaged nozzle
Nozzle too large
Product pressure too
low
Spray product viscosity
too high
Partial nozzle blockage Nozzle cleaning
Seals at the valve rod
are damaged
Valve rod damaged
Worn valve seat / valve
ball
Sealing screw too tight Check torque
GA 250AL_GA 400AL
Remedy
Select larger nozzle
Increase product pressure
Nozzle cleaning
Clean or replace filter
Replace the nozzle
Select smaller nozzle
Increase product pressure
Thin spray product in accordance
with the manufacturer's
instructions
Re-tighten sealing screw
Replace the sealing collar on
the valve rod
Replace valve rod
Check valve rod and flat jet
nozzle and replace if necessary.
See Chapter
13.1
7.2.4
7.2.3
13.1
7.2.4
10.3.1 / 10.3.2
10.3.1 / 10.3.2
10.3.1 / 10.3.2
7.2.3 / 10.3.1
10.3.2
33
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