Graco 15X303, Instructions And Parts Manual

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Troubleshooting
8 312782J
Troubleshooting
Before servicing this equipment always make sure to
relieve the pressure .
NOTE: Check all possible causes and solutions before
disassembling.
Repair
NOTE: See the Dosing Pumps manual (332339) for
disassembly instructions on PD2K system.
Disassembly
1. Relieve the pressure.
2. Flush the valve with a compatible solvent.
3. Relieve the pressure after flushing and disconnect
the fluid and air hoses.
4. Unscrew the cap (C) to remove spring pressure on
the valve.
NOTE: Another method of removing spring pres-
sure is by applying air to the ON port, to lift the valve
needle off the seat.
5. Unscrew the dispense valve from the adapter (A).
Inspect the needle ball (B). Also inspect the seat (S)
in the adapter for damage. The seat is reversible.
See F
IG
. 4.
NOTE: See Fluid Mix Manifold Manual 312781 for seat
replacement instructions and part numbers.
Problem Cause Solution
Valve will not close. Fluid needle binding. Clean, repair.
Piston o-rings binding. Repair.
Obstructed or worn needle or seat. Clean or replace.
Valve will not open. Fluid needle binding. Clean or repair.
Piston o-rings binding. Repair.
No trigger or actuator pressure. Check, clean all lines.
Worn or dry piston o-rings. Replace.
Valve will not dispense. Fluid supply source is not operating. Check on fluid supply source.
Fluid line clogged. Clear.
Fluid valve closed. Open.
Clogged orifice or needle seat. Clean.
F
IG
. 4. Valve Adapter and Seat
TI12822A
A
B
S
C
ON Port