Shutdown & Care - Graco EM 490 Instructions-Parts List Manual

1. Check the packing nut/wet–cup daily
pressure. Keep the wet–cup 1/3 full of TSL to help
prevent fluid buildup on the piston rod and premature
wear of packings. See Fig 8. Tighten the packing nut
just enough to stop leakage. Over tightening the
packing nut may cause binding and excessive pack-
ing wear. Use a round punch or brass rod and light
hammer to adjust the nut.
PACKING NUT/
WET CUP
Keep 1/3 full
with TSL
TURN PACKING
NUT CLOCKWISE
TO TIGHTEN
Fig 7–8
2. Flush the sprayer at the end of each work day and
fill it with mineral spirits. Proper flushing helps prevent
performance problems and costly equipment dam-
age. See FLUSHING GUIDELINES on page 9.
CAUTION
Never leave water or any paint in the sprayer over–
night to prevent pump corrosion and to prevent the
fluid from freezing or setting up in the pump, pres-
sure control, or hoses. Fluid which is allowed to
freeze or set up in the sprayer or other accessories
can cause loss of pressure, stalling or serious
equipment damage.
Always eliminate water or water–base fluid from the
spray system by using mineral spirits for the final
flush. Then relieve pressure and leave the mineral
spirits in the sprayer.
SHUTDOWN AND CARE
. Relieve 3. Lubricate the bearing housing
hours of operation. Remove the drive housing cover.
Fill the bearing housing cavity with SAE non–deter-
gent oil. See Fig 9.
OPERATION, FILL BEARING
HOUSING CAVITY WITH SAE
Fig 7–9
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4. For very short shutoff periods, leave the suction tube
in the paint, follow the PRESSURE RELIEF PROCE-
DURE on page 2, and clean the spray tip.
5. Coil the hose and lay it on top of the sprayer when
storing it, even for overnight, to help protect the hose
from kinking, abrasion, coupling damage, etc.
See the warning section HOSE SAFETY on page 3
for information on the hazard of using damaged
hoses.
EVERY 100 HOURS OF
NON–DETERGENT OIL
WARNING
after every 100
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