Service
Service
Pressure Relief Procedure
The system pressure must be manually relieved to pre- vent the system from starting or spraying accidentally. To reduce the risk of an injury from accidental spray from the gun, splashing fluid, or moving parts, follow the Pressure Relief Procedure whenever you,
•are instructed to relieve the pressure
•stop spraying
•check or service any of the system equipment
•install or clean the spray nozzle.
1.Engage trigger lock.
2.Turn engine ON/OFF switch to OFF.
3.Move pump switch to OFF and turn pressure control knob fully clockwise.
4.Unlock trigger lock. Hold metal part of gun firmly to side of grounded metal pail and trigger gun to relieve pressure.
5.Engage the trigger lock.
6.Open all fluid drain valves in the system, having a waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to spray again.
If you suspect the spray tip or hose is clogged or that pressure has not been fully relieved after following the steps above, VERY SLOWLY loosen tip guard retaining nut or hose end coupling to relieve pressure gradually, then loosen completely. Clear hose or tip obstruction.
Tools Needed
•Vise
•
•Hammer, 20 oz. maximum
•Small screwdriver
•Throat Seal Liquid
•Pick or long small screwdriver
Cleaning and Inspecting Parts
Never use a sharp or pointed tool to remove sleeve or other components which could result in pump rup- ture and cause serious bodily injury. If the sleeve cannot be removed easily, return the sleeve and cyl- inder to an authorized Graco distributor for removal.
•Clean and inspect all parts. Replace worn or dam- aged parts.
Component | What to look for |
|
|
Ball seats in intake valve | nicks or wear |
and piston |
|
|
|
Inside sleeve | worn or scratched |
|
|
Piston rod | worn or scratched |
|
|
•Remove and clean the sleeve when you are repack- ing the pump.
311845C | 3 |