11
310530
Operation
Pressure Relief Procedure
WARNING
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:
D
are instructed to relieve the pressure
D
stop spraying/dispensing
D
check or service any of the system equipment
D
install or clean the spray tip/nozzle
Use this procedure whenever you shut off the dispens-
er/sprayer and before checking or adjusting any part of
the system, to reduce the risk of serious injury.
1.
Lock the gun/valve trigger safety.
2.
Shut off the main air supply to the pump.
3.
Close all air bleed valves.
4.
Unlock the gun/valve trigger safety.
5.
Hold a metal part of the gun/valve firmly to the side
of a grounded metal drum or pail, and trigger the
gun/valve to relieve pressure.
6.
Lock the gun/valve trigger safety.
7.
Have a container ready to catch the drainage, then
open the drain valve or pump bleed valve.
8.
Leave the drain valve open until you are ready to
spray/dispense again.
If you suspect that the spray tip/nozzle 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
to relieve pressure gradually, then loosen completely.
Now clear the tip/nozzle or hose.
9.
To relieve pressure in the ram, see
Ram Pressure
Relief Procedure
in the supply unit’s documenta-
tion.
Emergency Stop
See instructions in either supply unit or system docu-
mentation for more information.
1.
On supply unit’s electrical control panel:
a.
Turn CONTROL ON switch to OFF.
b.
Turn OFF main electrical disconnect.
2.
Stop pump by closing Bleed-type Master Air Valve
closest to motor’s air inlet.
Daily Maintenance Procedures
WARNING
Use fluids and solvents that are chemically compat-
ible with the equipment wetted parts. See the
Technical Data
sections of all the equipment
manuals. Always read the material manufacturer’s
literature before using fluid or solvent in this pump.
1.
Clean out material build-up in wet-cup to extend
life of pump packing and displacement rod.
2.
Ensure packing nut/wet-cup is tightened to correct
torque setting, 203 – 237 N.m (150 – 175 ft-lb).
Do not overtighten packing nut.
3.
Before starting pump, fill wet-cup 1/3 full with
Graco Throat Seal Liquid or compatible solvent.
NOTE:
Adding Graco Throat Seal Liquid or other
compatible solvents to wet-cup will help lubricate
the seal and prevent material leakage.
For additional maintenance procedures, see the
Op-
eration/Maintenance
section of 308570.
