Graco 255828, Operations & Parts List

Page: 16 / 32

Repair
16 312888D
Repair
Tools Required
• flush can
• impinger cleanout brush
• 5/16 in. nut driver
• utility knife
• pin vise without cleanout spade
• gun block component hole cleanout brush
• check valve removal tool
• throat wrench
• pattern control tip front impinger packing seal
cleanout tool
• gasket removal tool
• wooden stick
• pry tool/rear impinger wrench
• pressure flush kit (optional)
Pattern Control Tip
1. Set safety stop to SERVICE (CLOSED).
2. Loosen pattern control tip with a 10 in. adjustable
wrench. Once loosened, unthread tip by hand.
3. Remove front impinger from front packing. It is not
necessary to remove front packing if no damage to
packing is evident or suspected.
4. Remove pattern control tip o-ring and front packing
from pattern control tip. If packing cannot be
removed by hand, use pliers. However, this will
require replacement of packings.
5. Use pattern control tip cleanout tool to clean inside
walls of tip. Flush tip and clean surrounding external
surface.
6. Set pattern control tip and front impinger and pack-
ing aside.
Screen Screw and Port Closure
Plugs
1. Perform Pattern Control Tip steps; see page 16.
2. Use a 5/16 in. nut driver to remove screen screw
mounting screw while holding large hex head of
screen screw with finger or against solid surface.
CAUTION
Shutdown proportioner and allow chemicals to cool
before servicing gun.
Clean A and R components in separate containers to
avoid cross contamination.
CAUTION
Ensure safety stop is set to SERVICE (CLOSED)
while removing pattern control tip. If it is not, the resil-
ient sleeve of the valving rod may be damaged.
If front packing and/or front impinger remain on
valving rod when pattern control tip is removed,
release trigger and carefully slide these parts off
valving rod.
Reassembly instructions are included in
Impingers , page 19.
Front Impinger
Front Packing
Pattern
Control
Tip
O-ring
Front Impinger
Front Packing
Pattern
Control
Tip