Maintenance And Inspection; Cleaning Procedure - Anest Iwata W-77 Manuel D'utilisation Et D'entretien

W-77 | W-71 Spray Guns _ PRESSURE | SUCTION | GRAVITY

5. MAINTENANCE AND INSPECTION

Before carrying out maintenance and inspection ALWAYS observe
warning indications.
- Never use spare parts that are not Anest Iwata originals.
- Never damage fluid nozzle tip, fluid needle or air cap holes.
- Never immerse the spray gun completely in liquids such as thinner.

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. Clean fluid passages and air cap set (1). Spray a small amount of
cleaner to clean fluid passages.
2. Clean each section with brush soaked with cleaner and wipe out with
waste cloth. Do not immerse the whole gun in the cleaner. If done, it can
damage parts. When cleaning, never scratch any holes of air cap set, fluid
nozzle, or fluid needle set.
3. DRY ALL PARTS completely and apply spray gun lubricant to each thread.
5.2 DISASSEMBLY PROCEDURE
BEFORE DISASSEMBLY, CLEAN FLUID PASSAGES
a. Disassemble fluid nozzle (2), while keeping fluid needle (10) pulled (triggering)
in order to protect its seat section.
b. Disassemble fluid needle set (10). (only when strictly necessary).
c. Remove the fluid adj. knob (8) and needle spring (9), extracting the spring and
fluid needle set (10), from the back of fluid adj. guide (7) set still assembled on
the gun body.
d. Adjustment of the needle packing set, must always be carried out with fluid
needle (10) still assembled, tightening the nut with a properly spanner, making
sure that excessive tightening does not impede movement of fluid needle (10),
resulting in paint leaking from fluid nozzle tip (2).
- When you remove needle packing nut (4), don't leave the plastic part of
needle packing set in the gun body.
- Try to adjust it carefully while pulling trigger and confirming movement of fluid
needle set (10).
- If you tighten it too much, repeat operation.
e. Disassembly of pattern adjustment set (5) and/or air adjustment set (14).
In order to disassemble pattern adj. set (5) and/or air adj. set (14), 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.
INSPECTION & REPLACEMENT STANDARD
WHERE TO INSPECT
a. Each hole passage of air cap
(1) and fluid nozzle (2).
b. Packing and O ring
c. Leakage from seat section
between fluid nozzle (2) and fluid
needle set (10).
REPLACEMENT PART
Replace if it is crushed or deformed.
Replace if it is deformed or worn out.
Replace them if leakage does not stop
after fully cleaning fluid nozzle (2) and
fluid needle set (10).
If you replace fluid nozzle (2) or fluid
needle set (10) only, fully matchthem
and confirm that there is no leakage.
6. TROUBLESHOOTING
PROBLEM
GUN DOES NOT SPRAY
Fluid adj. knob (8) closed.
Tip hole of nozzle obstructed. Check and clean it.
In case of suction or gravity:
Non drip obstructed.
INTERMITTENT SPRAY PATTERN
Air escapes from fluid
nozzle (2).
Air escapes from fluid needle
packing (4).
In case of suction or gravity:
Air escapes from cup joint.
Dirty inside air cap set (1).
DEFECTIVE SPRAY PATTERN
Dirty nozzle (2) or air cap
set (1).
Nozzle (2) or air cap (1) has
been damaged.
Fluid nozzle (2) is loose.
Paint viscosity too high or
too low.
Fluid output too high or
too low.
LEAKING
Fluid nozzle (2), needle set
(10) or gun body, dirty, dam-
aged or worn on seat.
Dirt inside air cap set (1).
Loose fluid adj. knob (8).
Fluid needle spring set (9)
is worn.
Loose fluid nozzle set (2).
Needle packing set (4) loose,
too tight, dirty or worn.
AIR ESCAPES FROM AIR CAP
Air valve (19), air valve seat
(20) or air valve spring (18)
dirty or damaged.
Air valve seat set "O"ring
(11) damaged or worn.
EN
REMEDY
Check and adjust it.
Check and clean it.
Check , clean or
replace.
Tighten.
Tighten.
Clean.
Clean carefully.
Replace if damaged.
Tighten.
Dilute paint or increase
viscosity.
Adjust fluid adj. knob (8)
to reduce or increase.
Check , clean or
replace.
Clean.
Adjust.
Replace.
Tighten.
Adjust, clean or replace.
Clean or replace.
Replace.
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