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MAINTENANCE
2. If possible, leave the copper washer under the cap in
place. At least be sure to replace it with the same
side up. (The top will show the imprint of the end cap,
while the bottom should be perfectly flat to match
seat in the pump casting.) See Paint Pump Assem-
bly Parts Diagram,Item 4 for replacement part num-
ber.
3. With a wire hook or tweezers, remove the small
spring inside the valve. Replace if broken, or worn or
clean as necessary. See Paint Pump Assembly
Parts Diagram, Item 4 for replacement part number.
This spring is manufactured to a very specific ten-
sion, so do not put in an unauthorized subsitute.
Proper spring length is 7-1/2 coils.
4. Using a six-millimeter allen wrench, remove the seat
and ball assembly. See Figure 48.
5. Clean parts thoroughly. If the ball or seat show any
sign of wear or damage, replace it with a new one.
This carbide ball must seal tightly against its seat for
the valve to function properly.
6. When reassembling, first cover all parts with a thin
coat of light oil. Tighten the valve seat securely with
the 6-millimeter hexagonal wrench, then drop in the
valve ball. Re-insert the spring and replace the cap,
being sure the copper washer is in place and the
tongue on the cap fits inside the spring. Tighten the
cap securely with an adjustable wrench. Do not
over-tighten.
CLEANING VALVES
Priming Knob Slippage
Sometimes the two allen screws holding the black
plastic PRIMING KNOB outer cover will vibrate loose.
This allows the knob to turn without changing the valve
setting. If this happens, loosen the screw with a 1/16
allen wrench, turn the knob to spray and retighten.
NOTE: Wear on the ball is almost impossible to
detect visually. A sure way to test for a worn outlet
valve assembly is to run the sprayer with water only
for 10 to 15 minutes on high pressure in the spray
setting without triggering the gun.
If the valve is defective, the end cap will get very hot
to the touch. If it is functioning properly, it will stay
approximately the same temperature as the water
running through it.
Cap
Ball
Seat
Spring
Figure 48 - Servicing Outlet Valve
A spare outlet
valve spring is in-
cluded in the lit-
erature set.
Seal