Graco 15X303, Instructions And Parts Manual

Page: 9 / 16

Repair
312782J 9
NOTE: See the parts drawings on pages 10 and 13.
6. Unscrew valve cap (11). Remove the spring (12).
7. Hold the needle flats with a wrench to keep it from
turning. Unscrew the piston (9, high pressure
valves) or retainer (10, low pressure valves) from
the needle.
8. Remove the o-rings (7, 8) from the piston (9).
9. Push the needle (22) from the top while pulling it
from the bottom of the fluid body (3).
NOTE: Needle may be hard to remove.
10. Unscrew the needle ball assembly (23) from the
needle (22).
11. Unscrew the fluid body (3) from the air body (6).
Remove the packing (19), bearing (5), and u-cup (4)
from the fluid body.
12. On high pressure valves, remove the o-ring (17)
from the air body (6).
13. Clean, inspect, and replace parts as needed.
Reassembly
NOTE: Seal Kits 15U933 (for high pressure dispense
valve 15X303 and 26A355), 24T817 (for acid catalyzed
valves 24T785 and 26A313), and 15W621 (for low pres-
sure dispense valve 15X304) are available to replace
the seals. Parts included in the kit are marked with an
asterisk, for example (4*). For best results, use all the
parts in the kit.
NOTE: Use the 262028 Seal Installation Tool (supplied
with the ProMix 2KS) to ensure proper installation of the
u-cup (4).
1. Using the 262028 Installation Tool, install the u-cup
(4*) into the fluid body (3) with the lips facing down.
Install the bearing (5*) and packing (19*).
2. Slide the needle (22*) into the fluid body (3) from
the top, down through the packing (19), bearing (5),
and u-cup (4).
3. Apply thread sealant and screw the needle ball
assembly (23*) onto the needle (22*).
4. Apply thread sealant and screw the fluid body (3)
onto the air body (6).
5. On high pressure valves, install the o-ring (17*) on
the air body (6).
6. Install the o-rings (7*, 8*) on the piston (9). Lubricate
the o-rings.
7. Reinstall the piston (9):
a. On high pressure valves, apply thread sealant
to the top threads of the needle (22*). Holding
the needle (22) steady by its flats, screw the pis-
ton (9) onto the needle (22*).
b. On low pressure valves, slide the piston (9) onto
the needle (22*). Apply thread sealant to the top
threads of the needle. Holding the needle (22)
steady by its flats, screw the retainer (10) onto
the needle.
8. Before performing step 9, screw the dispense valve
securely into the adapter (A, F
IG
. 4).
9. Install the spring (12) and valve cap (11).
NOTE: On high pressure valves, screw the valve cap
(11) onto the air body (6) only until slight resistance is
felt as the cap contacts the o-ring (17*).
Do not tighten
the valve cap (11) at this time.
10. Screw the valve cap (11) down onto the air body (6)
until additional resistance is felt and the cap is tight
with the body.
11. Unscrew the valve cap (11) one complete turn for
the factory needle setting, or unscrew cap to setting
prior to repair.
NOTE: To decrease needle travel, turn the cap (11)
clockwise; to increase, turn counterclockwise. The valve
is factory set at one open turn.
The maximum setting
is four turns open .