Operation/Maintenance
Pressure Relief Procedure
WARNING
SKIN INJECTION HAZARD
The system pressure must be manually relieved to prevent the system from starting or spraying accidentally. Fluid
under high pressure can be injected through the skin and cause serious injury. To reduce the risk of an injury from injection, splashing fluid, or moving parts, follow the Pressure Relief Procedure whenever you:
Dare instructed to relieve the pressure,
Dstop spraying,
Dcheck or service any of the system equipment,
Dor install or clean the spray tips.
1.Lock the gun trigger safety.
Packing Nut/Wet-Cup
Before starting, fill the packing nut (U) 1/3 full with Graco Throat Seal Liquid (TSL) or compatible solvent. See Fig. 7.
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure at left.
The packing nut is torqued at the factory and is ready for operation. If it becomes loose and there is leaking from the throat packings, relieve pressure, then tighten the nut as specified in your separate pump manual. Do this whenever necessary. Do not overtighten the packing nut.
2.Shut off the air supply to the pump.
3.Close the
4.Unlock the gun trigger safety.
5.Hold a metal part of the gun firmly to the side of a grounded metal pail, and trigger the gun to relieve pressure.
6.Lock the gun trigger safety.
7.Open the drain valve (required in your system), having a container ready to catch the drainage.
8.Leave the drain valve open until you are ready to spray again.
If you suspect that the spray tip or hose is completely clogged, or that pressure has not been fully relieved after following the steps above, very slowly loosen the tip guard retaining nut or hose end coupling and relieve pressure gradually, then loosen completely. Now clear the tip or hose.
Flush the Pump Before First Use
Pumps are tested with lightweight oil which is left in to protect the pump parts. To prevent contamination of the fluid, flush the pump with a compatible solvent before using it.
Model 254187 Shown | U |
4414B
Fig. 7
14 307932