Graco Inc. 237-296 - Manual (Page 10)

10 308-425
Operation
Shutdown and Care of the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
For overnight shutdown, stop the pump at the bottom
of its stroke to prevent fluid from drying on the ex-
posed displacement rod and damaging the throat
packings. Relieve the pressure.
Always flush the pump before the fluid dries on the
displacement rod. See Flushing below.
Flushing
WARNING
FIRE AND EXPLOSION HAZARD
Before flushing, read the section FIRE
OR EXPLOSION HAZARD on page 4.
Be sure the entire system and flushing
pails are properly grounded. Refer to
Grounding on page 5.
Flush the pump:
D Before the first use
D When changing colors or fluids
D Before fluid can dry or settle out in a dormant pump
(check the pot life of catalyzed fluids)
D Before storing the pump.
Flush with a fluid that is compatible with the fluid you
are pumping and with the wetted parts in your system.
Check with your fluid manufacturer or supplier for
recommended flushing fluids and flushing frequency.
CAUTION
Never leave water or water-base fluid in the pump
overnight. If you are pumping water-base fluid, flush
with water first, then with a rust inhibitor such as
mineral spirits. Relieve the pressure, but leave the
rust inhibitor in the pump to protect the parts from
corrosion.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure.
2. Remove the tip guard and spray tip from the gun.
See the gun instruction manual.
3. Remove the filter element from the fluid filter (4) or
surge tank. Reinstall the filter or surge tank bowl.
4. Place the suction tube (7) in a container of solvent.
5. Hold a metal part of the gun firmly to the side of a
grounded metal pail.
6. Start the pump. Always use the lowest possible
fluid pressure when flushing.
7. Trigger the gun.
8. Flush the system until clear solvent flows from the
gun.
9. Relieve the pressure.
10. Clean the tip guard, spray tip, and fluid filter ele-
ment separately, then reinstall them.
11. Clean the inside and outside of the suction tube
(7).