Graco A Series Instructions Manual page 4

Flush the Pump
Pumps are tested with No. 10 motor oil which is left in
to protect pump parts. To prevent contamination of
material, flush pump with a compatible solvent before
using. If pump is being used to supply a circulating
system, allow solvent to circulate for at least 10
minutes.
Starting and Adjusting Pump
Fill wet-cup (19) one half full with Grace Throat Seal Li-
quid (TSL), trigger spray gun and slowly open air supply
valve until pump starts (about 20 psi (1.4 bar)). Allow
pump to cycle slowly until all air is pushed out of lines.
Release trigger, pump will stall against pressure.
With pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop as the spray gun is triggered and released. In a cir-
culating system, it will run continuously and speed up or
slow down as supply demands until air supply is shut
Off.
Use an adequately sized air regulator to control pump
speed and material pressure. See ACCESSORIES.
Always use the lowest air pressure necessary to give
you the results you want.
Never exceed 95 psi (6.5 bar) air pressure to pump.
Keep the wet-cup (19) filled with Grace Throat Seal Li-
quid (TSL). See Fig 2.
Never allow the pump to run dry of material being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If your pump ac-
celerates quickly, or is running too fast, stop it im-
mediately and check the material supply. If the supply
container is empty and air has been pumped into lines,
prime pump and lines with material, or flush and leave
filled with compatible solvent. Be sure to eliminate all air
from fluid system.
Shutdown and Care of Pump
For overnight shutdown,
pressure and material pressure according to the
warning on page 3. Always
Pressure Relief Procedure
stop the pump at the bottom of its stroke to keep
material from drying on the exposed displacement rod
and damaging throat packings.
Always flush the pump before the material dries on rod.
If the pump is to be stored for any period of time, and
you are pumping water based material, first flush with
water, then with mineral spirits to protect the pump
parts from rusting.
4
shut off and relieve air
INSTALL WITH
WRENCH FLATS
AT TOP END
KEY
Throat Packing
4
Cylinder
Spacer
Bearing
Piston Packing
Intake Valve Housing
8
Ball Stop Pin
1 0
- 8
9
- 1 0
1 1
-14 NPT
1 1 Ball Guide
1 2 Ball
1 3 Packing
1 4 Piston Valve
1 5 Packing
Washer
1 7 Housing
18 Bearing
1 9 Nut (Wet-Cup)
20 Washer