Pro 501st Airless Paint Sprayer - Graco Inc.

Shutdown and Care
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 9.
1. Check the packing nut/wet-cup daily (102).
Relieve the pressure and unplug the sprayer.
Keep the wet-cup 1/3 full of TSL at all times to
help prevent fluid buildup on the piston rod and
premature wear of packings.
2. Tighten the packing nut/wet-cup (102) just
enough to stop leakage. Over-tightening causes
binding and excessive packing wear. Use a round
punch or brass rod and a light hammer to adjust
the nut. See Fig. 8.
7. For very short shutoff periods, leave the suction
hose in the paint, relieve the pressure, and clean
the spray tip.
8. Coil the hose when storing it, even for overnight,
to help protect the hose from kinking, abrasion,
coupling damage, etc.
Turn packing
nut clockwise to
tighten
102
+
–
3. Clean the gun’s fluid filter often and whenever
the gun is stored. Relieve the pressure first.
Refer to manual 307–614.
4. Periodically clean paint residue from the pressure
transducer (29) vent hole area. See Fig. 8.
Replace the transducer when leakage is excessive.
See page 29.
Fig. 8
Vent hole
02829A
5. Lubricate the bearing housing after every 100
hours of operation. Remove the front cover. Fill the
bearing housing cavity (A) with SAE 10 non-detergent
oil. See Fig. 9.
29
A
6. Flush the sprayer at the end of each work day
and fill it with mineral spirits to help prevent pump
corrosion and freezing. See page 12.
CAUTION
To prevent pump corrosion, and to reduce the
chance of fluid freezing in the pump in cold weather,
never leave water or any type of paint in the sprayer
when it is not in use. Freezing can seriously damage
the spray or result in a loss of pressure or
stalling.
Fig. 9
02827A