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Installation
General Information
NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in the figures and the
parts drawing.
NOTE: Always use Genuine Graco Parts and Acces-
sories, available from your Graco distributor. If you
supply your own accessories, be sure they are ade-
quately sized and pressure-rated for your system.
WARNING
To reduce the risk of bodily injury and property
damage, stop using the gun if the bayonet lock on
the gun handle is worn or damaged and prevents
the barrel from locking securely into position.
Installation
1. Insert a cartridge in the barrel. To ensure a good
seal, verify that the plunger end of the cartridge is
not torn. See Removing the barrel and Installing
the barrel elsewhere on this page.
2. Cut the cartridge nozzle tip to the desired opening
size. Cut the tip squarely rather than at an angle.
Puncture the inner seal of the cartridge.
3. Connect an air line to the 1/4” npt air hose fitting.
use an adjustable regulator to provide maximum
application control.
4. Adjust the air pressure to 10 to 15 psi (about 1
bar). Pull the trigger to start flow. Adjust air pres-
sure to help control the flow rate. The flow rate can
also be controlled through the trigger. When par-
tially triggered, air bypasses the valve (leaking of
air) and reduces the flow rate. When fully trig-
gered, no air escapes. Do not use more air pres-
sure than necessary to develop a good application
rate and solid bead.
5. Practice applying a bead on scrap material. Hold
the gun at a slight angle from the point of applica-
tion to produce a smooth, flat-tooled bead. Too
great an angle produces a round-tooled bead.
6. If the caulking compound continues to flow when
the trigger is released, disconnect the air line.
Remove the barrel (see Removing the barrel)
and check the plunger in the cartridge. Air will
bypass a stuck plunger. To free the plunger from
the wall of the cartridge, push the plunger forward
manually.
CAUTION
To extend the life of the bayonet lock, follow the
barrel installation and removal procedures carefully.
Removing the barrel
To remove the barrel from the hand grip, push the
barrel straight back and fully into the gun handle.
Continue pushing the barrel back while rotating the
gun barrel out of the bayonet lock and sliding it out of
the gun handle.
Installing the barrel
Place the barrel in the handle grip by pushing the
barrel straight back and fully into the gun handle.
Continue pushing the barrel back while rotating the
barrel into the bayonet lock, which locks the barrel into
the gun handle.
Repair
A spring/seal repair kit, P/N C27100, and a replace-
ment hose assembly, P/NC27106 are available. No
other parts are sold separately. See the Parts drawing
on page .