4
EN
AZ4 HTE-S IMPACT Junior -
Gravity Spray Gun
5. MAINTENANCE AND INSPECTION
CAUTION
Before carrying out maintenance and inspection ALWAYS
observe warning indications.
- Never use spare parts that are not AIR GUNSA originals.
- Never damage fluid nozzle tip, fluid needle or air cap hole.
- Never immerse the spray gun completely in liquids such as thin-
ner.
WHERE TO INSPECT
REPLACEMENT PART
a. The hole passage of air cap
(1) and fluid nozzle (2).
Replace if it is crushed or deformed.
b. Packing.
Replace if it is deformed or worn out.
c. Leakage from seat section
between fluid nozzle (2) and
fluid needle set (7).
Replace them if leakage does not stop
after fully cleaning fluid nozzle (2) and fluid
needle set (7).
If you replace fluid nozzle (2) or fluid
needle set (7) only, fully match them and
confirm that there is no leakage.
6.1
INSPECTION/ REPLACEMENT STANDARD
6. TROUBLESHOOTING
PROBLEM
REMEDY
GUN DOES NOT SPRAY
Fluid adj. knob (4) closed.
Check and adjust it.
Tip hole of nozzle (2) obstructed.
Check and clean it.
Paint filter obstructed.
Check and clean it.
Non drip obstructed.
Check and clean it.
INTERMITTENT SPRAY PATTERN
Air escapes from fluid nozzle (2).
Check , clean or replace.
Air escapes from fluid needle packing (8).
Tighten.
Air escapes from cup joint.
Tighten.
Dirty inside air cap set (1).
Clean.
DEFECTIVE SPRAY PATTERN
Dirty nozzle (2) or air cap set (1).
Clean carefully.
Nozzle (2) or air cap (1) has been damaged.
Replace if damaged.
Fluid nozzle (2) is loose.
Tighten.
Paint viscosity too high or too low.
Dilute paint or increase
viscosity.
Fluid output too high or too low.
Adjust fluid adj. knob (4) to
reduce or increase.
LEAKING
Fluid nozzle (2), needle set (7) or gun body,
dirty, damaged or worn on seat.
Check , clean or replace.
Dirt inside air cap set (1).
Clean.
Loose fluid adj. knob (4).
Adjust.
Fluid needle spring (6) is worn.
Replace.
Loose fluid nozzle (2).
Tighten.
Needle packing nut (8) loose, too tight, dirty
or worn.
Adjust, clean or replace.
AIR ESCAPES FROM AIR CAP
Air valve (9-2) air valve seat (9-3), air valve
spring (9-1) dirty or damaged.
Clean or replace.
5.1 CLEANING PROCEDURE
The fluid passages of the gun, must be cleaned thoroughly
after each use, especially after use with bi-component paints.
Incomplete cleaning can cause defective pattern shape.
- Never soak air cap set (1) in cleaning liquid for an extended period,
even when cleaning.
- Never use metal brush to clean the gun.
1. Drain remaining paint from spray gun and cup, into a suitable container.
2. Pour cleaner into cup.
3. Unscrew air cap (1) by 2 turns, to allow atomizing air to back flush, fluid
passages of the gun.
4. Pull trigger (11) and make sure, that atomizing air enters cup.
5. Leave cleaner for a few seconds, then empty it into suitable waste container.
6. Repeat procedure above, until spray gun is clean.
7. Remove air cap (1) and cup from gun, then clean each section with brush
soaked with cleaner and wipe out with waste cloth.
8. DRY ALL PARTS completely and apply spray gun lubricant to each thread.
Use neutral cleaner: pH value shall be 6 to 8, otherwise could
cause corrosion.
IMPORTANT: BEFORE DISASSEMBLY, FULLY CLEAN FLUID PASSAGES.
A.
Disassemble air cap (1) and fluid nozzle (2) from gun body, while keeping
fluid needle (7) pulled (triggering) in order to protect its seat section.
B.
Disassemble fluid needle set (7). (only when strictly necessary)
C.
Remove the fluid adj. knob (4) and needle spring (6), extracting the spring
and fluid needle set (7), from the back of fluid needdle guide (5) set still
assembled on the gun body.
D.
Adjustment of the needle packing nut (8), must always be carried out with
fluid needle (7) still assembled, tightening the nut with a properly spanner,
making sure that excessive tightening does not impede movement of fluid
needle (7), resulting in paint leaking from fluid nozzle tip (2).
- When you remove needle packing (17), don’t leave the plastic parts of
needle packing set in the gun body.
- Try to adjust it carefully while pulling trigger and confirming movement of
fluid needle set (7).
- If you tighten it too much, repeat operation.
E.
For the inspection and replacement of air valve components, remove trigger
stud (10) and trigger (11), after which disassemble all air valve components in
order: air valve seat (9-3), air valve (9-2), air valve spring (9-1).
To reassemble the air valve, reverse the procedure.
F. Disassembly of pattern adjustment set (3) and/or air adjustment set (12).
In order to disassemble pattern adj. set (3) and/or air adj. set (12), turn
manually turn the hexagon knob of the adjustment counter-clockwise to
open it completely and unscrew the hexagon face with a spanner turning it
counter-clockwise.
- To reassemble reverse the procedure.
IMPORTANT: Before reassembling pattern adjustment set and/or
air adjustment set, make sure that these operations are carried
out with the adjustment fully open.
5.2 DISASSEMBLE PROCEDURE
