INSTRUCTIONS-PARTS LIST
307–961
Rev A
PUMP PACKING 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 VERY SLOWLY 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 Warning, 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-Type 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).
Tighten the nut (B) onto
the valve to 10.5 in–lb (1.2 N.m) to seat the pack-
ings, and then back off 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
THROAT PACKINGS
DETAIL 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
