Graco DELTA SPRAY XT GUN 310692D Instructions - Parts Manual page 22

Replacing the fluid valve packings
1. Remove the fluid adjustment knob (21) and fluid
spring (23).
2. Pull the fluid needle (13) out the back of the gun.
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23
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3. Remove the fluid valve nut (19), air valve spring
(22), and air valve assembly (26). Discard the air
valve assembly. Using a mechanical pick, remove
the u-cup packing (16) from the gun body.
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13 21
22 37 20 19
ti4850a
4. Place the new u-cup packing (16) on the packing
installation tool (29), with the u-cup lips facing the
tool as shown.
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5. Push the packing (16) into the back of the gun until
a definite snap is felt.
6. Using a mechanical pick, remove the u-cup packing
(20) and spacer (37) from the fluid valve nut (19). Be
careful not to damage the seal surface or the nut's
internal threads.
7. Using the packing installation tool (29), install the
new u-cup packings (20) into the fluid valve nut (19).
The u-cup lips must face toward the tool as shown.
This will help apply even pressure to the u-cup lips
and avoid damaging them.
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8. Push the u-cup packings (20) into the fluid valve nut
(19) until a definite snap is felt.
Service
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310692D