Repair
312792F 5
Repair
General Information
Preparation
Follow all warnings and instructions in your pump man-
ual for the following preliminary steps:
1. Flush the equipment.
2. Relieve the pressure.
3. Remove the displacement pump from the pump
assembly.
Disassembly
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. Place cylinder (1)
sideways in a
vise with soft
jaws.
2. Use an adjustable
wrench on hex of
intake housing
(23) to unscrew it
from the lower
cylinder (2).
Loosen vice
briefly and tip out
the ball (24◆).
3. Remove the seat (22†) and use an o-ring pick to
remove the seal (26†) from the intake housing. See
F
IG. 7.
4. Use an adjustable wrench on hex of lower cylinder
(2) to remove it from the upper cylinder (1) and slide
it straight off the pump. Be careful not to damage
the piston/rod assembly (3).
5. Remove the o-ring (21*†) from the top of the lower
cylinder.
6. Loosen the wet cup (5).
7. Pull the piston/rod assembly out the bottom of the
upper cylinder. Remove the spring (10*), piston
packings (12* and 13*) and glands (11* and 14*).
8. Remove the wet cup (5).
9. Remove the throat packings (7*, 8*) and glands (6*,
9*) from the bottom of the wet cup.
10. Remove the spring (4*) from the top of the upper
cylinder (1).
NOTICE
Reference numbers and letters in parentheses in the
text refer to the callouts in the figures and the parts
drawing.
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.
NOTICE
Repair Kits are available. See the chart on page 11
to order the correct kit(s) for your pump.
• Parts included in the Seal Repair Kit are marked
with an *, for example 8*.
• Parts included in the Seat Repair Kit are marked
with a †.
• Parts included in the Check Ball Kit are marked
with a ◆.
Threads are very sharp. Use a rag to protect hands.
NOTICE
The jam nut can remain attached to the upper cylin-
der.
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