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Figure 21 -
Pump section replacement instructions
Kit Part Number 0418715
Always wear protective eye wear while servicing the pump. Be sure to follow the Pressure Relief Procedure when shutting
the unit down for any purpose, including servicing or adjusting. After performing the Pressure Relief Procedure, be sure to
unplug the unit before servicing or adjusting. Area must be free of solvents and paint fumes.
Danger
Disassembly of the Pump Section
1. Remove the suction set.
2. Remove the front cover and the three screws that secure it
using a T20 Torx head driver.
3. Remove the yoke screw (1) and washer (2) that secures the
dowel pin (3). The dowel pin connects the yoke (4) to the
piston (5).
4. Using a pliers, pull the dowel pin out.
5. Rotate the pump shaft so the piston is in the top dead center
position. This can be done by pushing on the yoke. This is
required to disassemble all the parts.
6. Unscrew the inlet valve unit (6) from the basic unit.
7. Remove the piston assembly by pushing down on the piston
near the yoke.
8. Unscrew and remove the top nut (7) using and adjustable
wrench.
9. Remove the worn seals using a flat head screwdriver or punch.
Remove the top seal (8) from the top and the bottom seal (9)
from the bottom by pressing against the side of the seal and
popping it out. Be sure not to scratch the housing where the
seals are located.
10. Clean the area where the new seals are to be installed.
Assembly of the Pump Section
1. Lubricate the new top seal (8) with Separating Oil or light
household oil and by hand place the seal (cup side of seal
down) into the top port of the housing.
2. Place a small amount of bearing grease on the threads of the
top nut (7). Place the top nut into the top of the housing and
tighten with an adjustable wrench. This will drive the top seal
into the correct position.
3. Turn the pump upside down. Lubricate the seal on the piston/
seal assembly (5, 9) similar to the top seal. Place the piston/
seal assembly into the bottom of the housing.
i
DO NOT attempt to remove the bottom seals from the
new piston.
4. Insert the insertion tool (10) and thread into position to
properly seat the piston/seal. Thread fully until tight. Remove
the insertion tool.
5. Align the piston (5) with the yoke (4). Be careful not to
damage the piston.
6. Apply a bearing grease to the holes in the yoke where the
dowel (3) is inserted.
7. Install the dowel pin (3) to connect the yoke to the piston. The
piston may have to be moved up or down to do this.
8. Install the yoke screw (1) and washer (2) to secure the dowel
pin.
9. Install the new O-ring (11) on the inlet valve assembly,
lubricate with Separating Oil or light household oil, thread
into the bottom (inlet) of the housing, and tighten with an
adjustable wrench. This will drive the bottom seal into the
correct position.
WAGNER Project Pro 117 - 0418B
10.
Turn pump right side up and apply a few drops of Separating
Oil or light household oil between the top nut (7) and piston
(5). This will prolong the seal life.
11. Install front cover and three (3) screws.
12. Install the suction set.
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