4
MaG HVLP aUtoMatic SPRaY GUn Maintenance/tRoUBLeSHootinG
and SeRVice inStRUctionS
Use white lithium based grease to
lubricate all o-rings and moving parts
before reassembly into the gun body.
To further protect the environment, avoid
storing solvents or solvent-soaked wipes,
such as those used for surface
preparation and cleanup, in open or
absorbent containers.
tRoUBLeSHootinG
Numbers in parentheses refer to
individual items shown on the exploded
drawing on page 7.
SeRVicinG/RePLacinG
fLUid nozzLe and
fLUid needLe aSSeMBLY
Service symptoms:
• Build-up on air cap or clogged
fluid nozzle assembly
• Fluid nozzle not sealing properly.
1. Remove valve control (1). Lock-nut (2)
and needle return spring (4). Pull item
(8) needle assembly back or remove it so
you don’t damage the needle when
servicing or replacing fluid nozzle.
Service or replace fluid nozzle assembly
and reassemble in reverse order.
Lubricate needle with Copper PTFE
Grease 540395 before inserting through
fluid cartridge.
2. Turn retaining ring (19) counter
clockwise and remove.
3. Remove air cap (20).
4. Turn fluid nozzle (21) counterclockwise
and remove.
5. Service or replace and reassemble in
reverse order.
RePLacinG fLUid caRtRidGe
aSSeMBLY
Service symptoms:
• Fluid leaking from weep port
1. Turn end cap (3) counterclockwise and
remove it with the piston and needle
return spring from the piston body (25).
2. Remove fluid needle assembly (8).
3. Using the two 8-32 screws (41) provided
in loose parts bag, thread the 8-32 screw
into the two threaded holes in the back of
the piston. Pull the two threaded screws
and remove the piston.
4. Place the supplied 3/8" deep socket over
fluid cartridge assembly (18) and turn it
counter clockwise.
5. Remove and reassemble in reverse
order using the new fluid cartridge
assembly.
RePLacinG o-RinGS on
PiSton aSSeMBLY
Service symptoms:
• Atomizing air not cycling off
• Air not actuating fluid
1. Turn end cap (3) counterclockwise and
remove it with the piston return spring
(7) and needle return spring (4) from the
piston body (25).
2. Remove fluid needle assembly (8).
3. Using the two 8-32 screws (41) provided
in loose parts bag, thread the two 8-32
screws into the two threaded holes in the
back of the piston. Pull the two threaded
screws and remove the piston.
4. Replace o-rings (13, 14, 16 and 17) using
standard piston o-ring repair kit 54-5303
or high performance piston o-ring repair
kit 54-5307.
5. Apply MG75 PTFE based lubricant
provided in the o-ring repair kits to
o-rings and reassemble in reverse order.
SeRVicinG/RePLacinG
oPtionaL fiLteR
Service symptoms:
• Fluid tip clogging or restriction
in fluid flow
1. Using a 3/4" inch wrench, turn filter
retainer (40) counterclockwise and
remove.
2. Place a standard screwdriver inside
the cavity where the filter (39) is housed
and dislodge it by lifting up with the
screwdriver. Remove filter and clean or
replace as required. Most of the time you
can dislodge the filter using your finger.
3. Reassemble in reverse order.
ReMoVinG/RePLacinG GUn
aSSeMBLY ModULe onLY fRoM
inLet ManifoLd aSSeMBLY
1. Using a 9/64" Allen wrench, turn retaining
cap screw (22) counterclockwise typical
4 places and remove gun sub module.
2. Mount the new gun module, tightening
the retaining screws (22). This will allow
fluid and air passages to seal with no
contamination.
notE
disassemble spray gun and remove
all o-rings before immersing gun in or
subjecting it to a flood-wash of cleaning
solvent. contact with solvents may
induce o-ring swelling beyond their
specification sizes and cause
subsequent malfunction of the gun.
caution
never use metal instruments to
clean or scrape fluid or air nozzles.
these parts have been carefully
machined and altering their shape
will cause faulty spray.
!
notE
o-ring (28) does not require
replacement when servicing filter.
Replace o-ring (28) if a leak
develops around filter retainer (27).
notE
o-rings (24 & 26) must be replaced
when replacing gun sub module.
WaRning
Be sure to follow all safety
precautions described on page 2
before working on the spray gun.
never work on the spray gun until
fluid pressure has been relieved
throughout the system and the
power or air supply for the fluid
pump has been disconnected. always
test the repaired gun for leaks with
low pressure fluid before use.
!
