INSTRUCTIONS-P
ARTS LIST
307–961
Rev
A
PUMP
P
ACKING KIT 222–687
For
Use In Displacement Pump 222–688
Pressure Relief Procedure
To
reduce
the risk of serious bodily injury
, includ
-
ing
fluid injection, splashing fluid or solvent in the
eyes
or on the skin, or injury from
moving parts or
electric shock, always follow this procedure
whenever you shut off the sprayer, when check-
ing or servicing any part of the spray system,
when installing, cleaning or changing spray tips,
and
whenever you stop spraying.
1.
Engage the gun safety latch.
2.
Turn the ON/OFF switch to OFF.
3.
Unplug the power supply cord.
4.
Disengage
the gun safety latch. Hold a
metal
part
of the gun firmly to the side of a grounded
metal
pail, and trigger the gun to relieve pres
-
sure.
5.
Engage the gun safety latch.
6. Open
the pressure drain valve, having a con
-
tainer
ready to catch the drainage. Leave the
valve
open until you are ready to spray
again.
If you suspect that the spray tip or hose is com-
pletely clogged, or that pressure has not been
fully
relieved after following the steps above,
wrap
a rag around the tip guard retaining nut or hose
end
coupling and VER
Y SLOWL
Y
loosen the part
to relieve pressure gradually, then loosen com-
pletely.
Now clear the tip or hose.
WARNING
1. Flush
the
pump, if possible. Follow the
Pressure
Relief
Procedure W
arning
, above.
2. Disassemble the pump. Clean and inspect all
parts for wear or damage and replace parts as
needed.
Coat the rod and the inside
of the cylin
-
der
with oil before reassembling.
NOTE: All
sprayers with DC/Brush-T
ype Motors:
When
replacing the pump packings, also in
-
spect the motor brushes and replace them,
if necessary.
3. Stack the backup washer (19), seal (5), female
gland (20), packings (17) and male gland (13)
onto
the piston valve (24).
T
ighten the
nut (B) onto
the
valve to 10.5 in–lb (1.2 N.m) to seat the
pack
-
ings,
and then back of
f and tighten finger tight.
Note
the alignment
of the
piston valve (D) to the
nut
(B) and maintain this alignment through Steps
3,
4 and 5. This helps ensure that the nut (B) does
not
overcompress and swell the packings, which
can
cause
them to be damaged when the piston
assembly
is installed in the cylinder
.
GRACO INC. P.O. BOX 1441
MINNEAPOLIS, MN
55440–1444
COPYRIGHT
1989, GRACO INC.
This
manual contains
IMPORTANT
INSTRUCTIONS and WARNINGS.
READ AND RETAIN FOR REFERENCE.
LIPS
OF
V–PACKING IN
THROAT MUST
FACE DOWN
DETAIL
OF
THROA
T P
ACKINGS
DET
AIL OF
PISTON PACKINGS
Fig
1
B
F
18
17
POLY
H
13
5
U-CUP SEAL
LIPS FACE DOWN
19
D
6
4
J
7
3
E
G
12
11
20
ROD
PACKING
NUT
JAM NUT
FEMALE
GLAND
MALE
GLAND
SMALL BALL
CYLINDER
PISTON NUT
MALE GLAND
BACKUP WASHER
GASKET
BALL GUIDE
LARGE BALL
PIN
PISTON
VALVE
FEMALE
GLAND
INTAKE VALVE
LIPS OF
V–PACKING IN
THROAT MUST
FACE DOWN
POLY
LIPS OF
V–PACKING IN
PISTON MUST
FACE UP
LIPS OF
V–PACKING IN
PISTON MUST
FACE UP
K
L
PLUG
