Pump Packing Nut Adjustment - Graco A Series Instructions-Parts List Manual

3. Trigger the gun into the flushing container. When
mineral spirits appear at the fun, release the trigger
and set the trigger safety latch. Remove the pump.
4. Release the trigger safety latch. Trigger the gun to
force the mineral spirits from the system. DO NOT
run the pump dry for more than 10 seconds to avoid
pump packing damage.
5. Disconnect the hose and fun and store the pump.

Pump Packing Nut Adjustment

NOTE: Perform this adjustment if:
a. Material drips steadily from the air motor weep
hole, which indicates the packings are too
loose.
b. The pump requires more than 35 psi (0.24 MPa,
2.4 bar) air pressure to cycle when the gun is
triggered, which indicates the packings are too
tight.
1. Relieve the pressure. See Pressure Relief Proce-
dure on page 8.
2. Remove the six screws (24) using a 1/4" nut driver.
Remove the muffler plate. (F
BASE
20
24
F . 12
IG
308069P
. 12)
IG
3. Check to see that the air motor piston is at the top of
the stroke. If it is not, while keeping your fingers
away from moving parts, apply very low pressure
air to the air inlet to move the piston up. Close the
air regulator and disconnect the air supply hose.
(F . 13)
IG
PISTON
PINCH POINT
BASE
F . 13
IG
4. Use a 1/4" diameter rod to tighten the packing nut.
First loosen the nut, then tighten snugly, and finally
tighten 1/4 turn more. (F
F . 14
IG
5. Replace the muffler cover and the six screws (24).
(F . 12)
IG
6. Reconnect the air line. After the pump is started, it
should run at 20 psi (0.138 MPa, 1.38 bar) with no
load. Start up may require additional air pressure.
Maintenance
FLUID
OUTLET
WEEP HOLE LOCATED
OPPOSITE FLUID OUTLET
AND IN BOTTOM OF BASE
. 14)
IG
PACKING NUT
1/4" DIA. ROD
13