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7. If material buildup prevents easy removal, use
three-pronged end of check valve removal tool to
grasp check valve and turn free.
Opposite end of check valve removal tool is
designed to clean check valve cavity.
8. Place all parts in gun cleaner and flush exposed
ports.
Reassembly
1. Inspect seats on gaskets for nicks. Replace seats if
damaged.
2. Insert check valves (notched valve on left side) and
gaskets into gun block pressing gaskets in place.
Gaskets are designed for use on either side. Care-
fully check angular seat to ensure sealing point of
check valve.
3. Place coupling block to gun and use 5/16 in. nut
driver to install coupling block mounting screw.
312888D
Impingers
Disassembly and Cleaning
1. Follow Pressure Relief Procedure, page 12.
2. Perform Pattern Control Tip steps; see page 16.
3. Remove rear impinger from throat. Hold throat in
place with throat wrench (604) and use rear
impinger wrench 28576 to loosen impinger from
throat. Continue un-threading by hand.
Rear Impinger
Throat
4. Flush gun block with gun cleaner.
5. Inspect seating surface (area around center hole)
within throat for damage. Use a soft object, such as
a wooden stick or soft brush, to clean surface.
CAUTION
Never use a sharp or hard metal object for cleaning
impingers or throat. Seating surface of throat is highly
polished to ensure sealing of resilient sleeve.
6. Use impinger cleaning brush (608) to clean both
external and internal threads of throat.
7. Use impinger cleaning brush to clean rear and front
impingers. Use cleanout spade to clean each injec-
tion slot of both impingers.
Injection Slots
Rear Impinger
Reassembly
1. Assemble rear impinger into throat. Thread slotted
end of rear impinger into female thread of throat.
Hold throat in place with throat wrench and use rear
impinger wrench to tighten impinger into throat.
Repair
Front Impinger
19
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