Here are the diagrams and repair parts for Official Craftsman 78614441 3-gallon polyethylene sprayer, as well as links to manuals and error code tables, if available.

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#18
Compressed air sprayer diagram
Shut-off
Part #3-1866
The manufacturer no longer makes this part, and there's no substitute part
#23
Compressed air sprayer diagram
Lawn sprayer washer
Part #1-3635
The manufacturer no longer makes this part, and there's no substitute part
#26
Compressed air sprayer diagram
Lawn sprayer shut-off handle fiber gasket
Part #1-3632
The manufacturer no longer makes this part, and there's no substitute part
#14
Compressed air sprayer diagram
Lawn sprayer check valve
Part #1-4324
The manufacturer no longer makes this part, and there's no substitute part
#10
Compressed air sprayer diagram
Lawn sprayer plunger rod cup spreader
Part #2-3017-1
The manufacturer no longer makes this part, and there's no substitute part
#12
Compressed air sprayer diagram
Barrel
Part #3-7039
The manufacturer no longer makes this part, and there's no substitute part
#28
Compressed air sprayer diagram
Lawn sprayer fiber washer
Part #1-5297
The manufacturer no longer makes this part, and there's no substitute part
#4
Compressed air sprayer diagram
Pump rod spring
Part #1-2931
The manufacturer no longer makes this part, and there's no substitute part
#27
Compressed air sprayer diagram
Bushing
Part #1-4570
The manufacturer no longer makes this part, and there's no substitute part
#32
Compressed air sprayer diagram
Lawn sprayer adjustable spray nozzle cap
Part #1-4973
The manufacturer no longer makes this part, and there's no substitute part