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13
19. Insert the piston rod into the bottom of the upper housing,
through the lower packing, through the upper packing, and out
through the upper seal retainer.
NOTE: When repacking the fluid section, make sure the
raised lip on the bottom of the lower packing is fully
outside the packing around the piston rod after
insertion of the piston rod.
20. Remove the piston insertion tool from the top of the piston
rod.
21. Lubricate the threads on the upper housing with anti-seize
compound. Remove the upper housing from the vise.
22. Insert the piston rod into the extension slider. When the
connecting pin hole on the piston rod lines up with the hole
in the extension slider, insert the connecting pin.
23. Thread the upper housing into the cylinder, turning clockwise.
24. Continue to turn the upper housing clockwise until it is flush
against the cylinder.
NOTE: If the fitting on the upper housing does not face the
tool box side of the unit, turn the upper housing
counterclockwise until the nipple faces the tool
box side of the unit. Do not turn the upper housing
more than one full turn counterclockwise.
25. Making sure that the Viton o-ring and PTFE back-up ring are
lubricated and in place, thread the lower housing into the
upper housing. Using two wrenches, hold the upper housing
at the wrench flats with one wrench and tighten the lower
housing with the other.
26. Attach the high-pressure hose to the fitting on the upper
housing and tighten with a wrench. Do not kink the hose.
27. Making sure that the Viton o-ring and PTFE back-up ring are
lubricated and in place, reassemble the foot valve assembly
and and thread it into the lower housing. Tighten securely.
28. Replace the return hose into the clamp on the siphon tube.
29. Place the front cover on the gearbox housing and secure in
position using the four front cover screws.
30. Turn on the sprayer by following the procedure in the
“Operation” section of this manual and check for leaks.
NOTE: Repacking kit P/N 800-273 is available. For best
results use all parts supplied in this kit.
Replacing the Filters
Gun Filter
1. Pull the bottom of the trigger guard forward so that it comes
loose from the handle assembly.
2. Loosen and remove the handle assembly from the gun head.
3. Pull the old filter out of the gun head.
4. Slide the new filter, tapered end first, into the gun head.
5. Make sure all the parts are clean and the handle seal is in
position inside the gun head.
6. Thread the handle assembly into the gun head until secure.
7. Snap the trigger guard back onto the handle assembly.
Handle
Handle
Seal
Trigger
Guard
Filter
Gun
Head
NOTE: For more detail, part number information, and
complete assembly drawings, refer to the S-3 Airless
Spray Gun Owner’s manual (P/N 313-2440).
Pump Filter
Filter Body
Filter Spring
Filter Spring
Adapter
Core Spring
Filter
O-ring
Filter Housing
1. Loosen and remove the filter
body by hand.
2. Slip the filter off of the core
spring.
3. Inspect the filter. Based on
inspection, clean or replace the
filter.
4. Inspect the o-ring. Based on
inspection, clean or replace the
o-ring.
5. Slide the new or cleaned filter
over the core spring with the
filter spring adapter in place.
Push the filter into the center of
the filter housing.
6. Slide the filter body over the
filter and thread it into the filter
housing until secure.
NOTE: The filter body should
be hand-tightened, but
make sure it is seated
fully into the filter
housing.
