10
Type of malfunction Possible causes Correction
Drops form on the trigger – The needle gasket 5 is
worn respectively loose
and must slightly be
retightened.
• For that purpose
remove needle/valve
cartridge, see
section 4.3. Then
unscrew screw at the
valve body 4 and take
out needle driver
(squared bolt). Using a
small screw driver turn
stuffing box 6 gently
clockwise and try if
needle is sliding
smoothly again within
the tightened gasket.
Drops form on the nozzle – Either needle or nozzle
is worn.
– Needle is not closed
properly e.g. because
of particle residues
within nozzle.
• Replace needle or
nozzle.
• Clean the needle/valve
cartridge with solvent,
see section 5.
There is an uneven and
not steady spray jet – Dirt residue within air
cap.
– Nozzle is not correctly
screwed in.
• Clean air cap with
solvent.
• Make sure that nozzle
is screwed in tight.
Air blowing constantly
although trigger is
released.
– O-ring 9 and/or
washer 10 worn.
– Needle nuts are not
counter-screwed in
correct position, see
section 5.3.
• Change O-ring and/or
washer.
Drops form on the
extension at the applicator
and/or the spray head.
– O-rings are worn. • Change O-rings, see
section 7.2.