4
DISTURBANCES DURING OPERATION
Fault
Reason
Remedy
Pulsation
1. Air penetrates between the nozzle and its
tapered seat in the body.
2. Air is drawn in through the head seal.
1. Unscrew the nozzle in order to clean the
seat – replace if damaged.
2. Seal the head.
Crescent
1. Lacquer residues inside the head, partially
clogged the head holes. Different air
pressure in head holes.
1. Remove soiling from head holes. Do not
use metal objects to do this.
Skew
1. Lacquer residues on the nozzle hole
edges, or damaged central hole in the head.
2. Loose nozzle.
1. Remove soiling from the nozzle or replace
it if damaged.
2. Unscrew the nozzle and clean its seat.
Splitting
1. Too low lacquer viscosity.
2. Too high liquid outflow.
1. Add more lacquer in order to increase
viscosity.
2. Adjustment with jet or needle control knob.
Separate stains
1. Too low lacquer viscosity.
2. Too high liquid outflow.
1. Reduce viscosity.
2. Increase liquid outflow.
Spitting
1. Nozzle and needle are incorrectly
mounted.
2. Too short stroke of release trigger
opening air flow.
3. Lacquer residues inside the head.
1. Clean or replace nozzle and needle.
2. Replace nozzle and needle unit.
3. Clean the head.
PROBLEMS AND TROUBLESHOOTING
Problem
Location
Parts to check
Reason
Solution
Press
down
Adjust
Clean
Replace
Air leak from head
hole
Air
valve
Air valve
Dirty or soiled seat
X
X
Air valve
seat
Soiled or damaged
X
X
Worn out valve spring
X
Valve sealing
Damaged or aged
X
Lacquer leak
Spray gun nozzle
hole
Nozzle - needle unit
Soiled, damaged,
seat wear
X
X
Loose needle knob
X
Worn out needle spring
X
Nozzle - body
Insufficiently tightened
X
Soiled or damaged seat
X
X
Needle seal
Needle does not return to
closed position - seal too
tight
X
X
Needle does not return to
closed position - lacquer
residues on the needle
X
X
Needle
seal
Needle seal
needle unit
Wear
X
X
Seal
Insufficient pressing down
X
Lacquer does not
flow out
Nozzle hole
Needle knob
Insufficient opening
X
Nozzle hole
Clogged
X
Lacquer filter
Clogged
X
X
Sales Office : 05-083 Zaborów, Borz
ę
cin Du
Ŝ
y, Poland
ul. Warszawska 749
phone: (022) 752-06-00 fax: (022) 752-05-92
e-mail: [email protected] www: www.nts.com.pl