Repair
4
3A2313E
Repair
Reference numbers and letters in parentheses in the
text refer to the callouts in the figures and the parts
drawing.
Disassembly
NOTE:
Repair kits are available. See the chart on
page 10 to order the correct kit(s) for your pump.
See F
. 2 on page 5 for disassembled view of the dis-
placement pump. Lay out all removed parts in sequence
to ease reassembly. Clean all parts with a compatible
solvent and inspect them for wear or damage.
1.
Prior to removing pump, flush the system. See the
system manual.
2.
Perform Pressure Relief Procedure. See the system
manual.
3.
Remove the displacement pump from the system.
See the system manual.
4.
Place cylinder (1) sideways in
a vise with soft jaws.
5.
If inlet ball check needs repair,
use an adjustable wrench on
hex of foot valve (25) to
unscrew it from the lower cylin-
der (19). Loosen vice briefly
and tip out the ball (22).
Remove the seat (21) and use an o-ring pick to
remove the o-ring (24) from the foot valve.
6.
If the ball check does not need repair,
remove foot
valve (25) and lower cylinder (19) as one piece. Use
an adjustable wrench on hex of lower cylinder (19)
to remove it from the upper cylinder (1) and slide it
straight off the pump. Be careful not to damage the
piston/rod assembly (11).
7.
Remove the o-ring (20) from the top of the lower cyl-
inder.
8.
Loosen the wet cup (3).
9.
Pull the piston/rod assembly out of the bottom of the
upper cylinder. Remove the spacer (16),
bushing (17), and seal (18) from the bottom of the
upper cylinder (1).
10. Remove the wet cup (3).
11. Remove the busing (6) and seal (7) from the bottom
of the wet cup.
NOTE:
The jam nut (28) can remain attached to the
upper cylinder.
12. Remove the spacer (2) from the top of the upper cyl-
inder (1).
13. Remove the wet cup seal (4) and the upper cylinder
seal (5).
14.
If piston ball check needs repair,
clamp the rod flats in a vice. Use
a 13 mm (1/2 in.) hex wrench to
remove the flow-through nut (13)
from end of piston.
15. Remove the o-ring (14), seat (12)
and ball (15).
NOTICE
Always use Genuine Graco Parts and Accessories,
available from your Graco distributor. If you supply
your own accessories, be sure they are adequately
sized and pressure rated for your system.
Threads are very sharp. Use a rag to protect hands.
ti12918a
1
25 19
ti12782a
13
