Graco GUSMER D Series Instructions Manual page 20

Repair
b. Use check valve cleanout drill to clean inside of
closure screw. Insert the flattened end of
cleanout drill into opening at end of screw,
avoiding spurs in the closure screw. Do not spin
drill until the flat on the drill has cleared spurs.
Spin drill with your fingers to loosen any
buildup, then remove drill and flush inside of
screw with gun cleaner. Next, check area where
ball seats for damage. Also check sleeve for
damage; it should fit tightly on the end of the
screw. If there is damage or if the sleeve fits
loosely, replace it. Replace sleeve if check
valve can be threaded all the way into gun block
by hand. A good check valve requires the use of
a 5/16 in. nut driver to make the last 1/4 turn,
compressing the sleeve. This compression is
required to create an internal seal in the gun
block.
c. Remove damaged check valve sleeve. Remove
ball and spring. Insert check valve into check
valve sleeve removal block (F
holding block, and keeping pressure on head of
check valve, slice check valve sleeve with razor
knife at a 10 - 15 degree angle relative to the
plane of removal block. Remove check valve
from block and peel sleeve off. If check valve
sleeve remains in gun block after removing
check valve, use extractor tool to remove
sleeve. Insert threaded end of tool into cleanout
port and, while pressing tool into gun block, turn
it clockwise several times. Withdraw tool from
gun block; sleeve should slide out with tool.
Check Valve Sleeve
Insert Check Valve
F . 24 Sleeve Removal Block
IG
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14. Remove retaining ring, washer, and felt wiper from
. 24). While
IG
d. Insert spring assembly into check valve and turn
the screw clockwise. When the spring is fully
inserted, stem will jump over spurs in screw and
make clicking sound. Ensure ball fully seats in
check valve. If not, or ball is damaged, replace
with new ball and spring assembly.
retainer. Flush retainer with gun cleaner, insert new
felt wiper and washer, then install retaining ring.
Loosely thread felt wiper retainer into rear of mixing
chamber. Do not tighten. If not installing to gun
block, store assembly in plastic vial with
corresponding cleanout spade.
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