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8 308253
Service
WARNING
SKIN INJECTION HAZARD
To reduce the risk of a serious injury,
including fluid injection,
D Follow the Pressure Relief Procedure on page
6 when you stop dispensing, before servicing
the gun, and whenever you are instructed to
relieve the pressure.
D After adjusting or servicing the gun, make sure
the fluid will not trigger on when the trigger
safety is locked. If fluid does flow, the gun is not
assembled properly or the trigger safety is
damaged. Reassemble the gun or return it to
your nearest Graco distributor. Do not use the
gun until the problem is corrected.
D When removing the gun from the hose, hold the
hex end of the fluid tube (19) securely to avoid
loosening the fluid tube from the gun body.
Refer to Fig. 6, page 13.
SERVICE NOTES:
WARNING
SKIN INJECTION HAZARD
To reduce the risk of a serious injury,
including fluid injection, if fluid continues
to flow after the trigger is released,
service the gun immediately as instructed below.
Do not use the gun until the problem is corrected.
1. The numbers in parentheses in the text refer to
reference numbers in the drawings.
2. If the fluid continues to flow after the trigger is
released, the gun valve may need adjustment, be
obstructed or damaged, or the valve stem (24),
seat (26), or seal (3) may be worn or damaged.
See Fig. 4, page 11.
a. Adjust the valve or the spring tension as
instructed on page 9.
b. Replace the valve seal, stem, or seat as
instructed on page 10.
c. To inspect the valve for obstruction or damage,
disassemble the gun as instructed on page 11.
Clean and inspect the parts. Replace any worn
or damaged parts and reassemble the gun as
instructed on page 11.
3. Follow the torque, sealant and lubrication notes for
your gun model number.
4. The following repair kits are available:
Gun
Model
Repair
Kit
Description
235627 235658* 6.5_ needle, seat, urethane
seal
235875 PTFE seal, o-rings only
235869 20_ needle, seat, urethane
seal
237596 7.5_ carbide needle, seat,
urethane seal
235628 235829* Carbide ball seat, ure-
thane seal
235875 PTFE and CV75 seal, o-
rings only
243775 237596* 7.5_ carbide needle, seat,
urethane seal
235875 PTFE seal, o-rings only
237607 237596* 7.5_ carbide needle, seat,
urethane seal
235875 PTFE seal, o-rings only
235869 20_ SST needle, seat, ure-
thane seal
237649 237596* 7.5_ carbide needle, seat,
urethane seal
* These are the standard Repair Kits for the gun
models. The other kits listed are optional.
NOTE: The fluid flow rates of guns using Repair Kits
235658 and 237596 are similar. Kit 235869 will provide
increased fluid flow. Kits 235658 and 235869 should
not be used to dispense abrasive fluids.