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Fluid Section Seal Replacement Instructions
Kit Part Number 0512221A (9145 and 9155) Kit Part Number 0516724 (9175 and 9195)
Always wear protective eye wear while servicing the pump. Be sure to follow the Pressure Relief Procedure
(page 7) 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.
Disassembly of the Fluid Section
1. Remove the suction set.
2. Remove the front cover and the four screws that secure it
using a T20 Torx head driver.
3. Remove the yoke screw and washer that secures the
dowel pin. The dowel pin connects the yoke to the piston.
4. Using a pliers, pull the dowel pin out.
5a. For models 9145 and 9155, 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.
5b. For models 9175 and 9195, inspect the yoke assembly
and piston. In order to remove all the necessary parts, the
piston must not be in the bottom dead center position. If
the piston is at the bottom of the stroke, install the front
cover and screws, turn the pump on briey to index the
piston, unplug the unit, and repeat step 2.
6. Unscrew and remove the inlet valve assembly (see page
20).
7. Remove the piston assembly by pushing down on the
piston near the yoke.
8. Unscrew and remove the top nut using and adjustable
wrench.
9. Remove the worn seals using a at head screwdriver or
punch. Remove the top seal from the top and the bottom
seal 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 Fluid Section
1. Lubricate the new top seal with Separating Oil (P/N
0516913, sold separately) 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 anit-seize on the threads of the
top nut. 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 similar to the
top seal. Place the piston/seal
assembly into the bottom of the
housing. Insert the plastic insertion
tool and thread into position to
properly seat the piston/seal.
Thread fully until tight. Remove the
insertion tool.
4. Install the new O-ring on the inlet valve assembly,
lubricate with Separating Oil (P/N 0516913), thread into
the bottom (inlet) of the housing, and tighten with an
adjustable wrench. This will drive the bottom seal into the
correct position.
5. Align the piston with the yoke. Be careful not to damage
the piston.
6. Apply any type of household grease to the piston and yoke
area to prolong life. Apply to the holes in the yoke where
the dowel is inserted.
7. Install the dowel pin 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 and washer to secure the dowel pin.
9. Turn pump right side up and apply a few drops of
Separating Oil or light household oil between the top nut
and piston. This will prolong the seal life.
10. Install front cover and four (4) screws.
11. Replace inlet valve. Install the suction set.
Insertion
tool
0512221 kit
(9145, 9155)
0512178 kit
(9175, 9195)
0512178 kit
(9175, 9195)
Top seal
(cup
down)
Top nut
0512221 kit
(9145, 9155)
Piston/seal
assembly
O-ring
NOTE - DO NOT attempt
to remove the seals from
the piston.
Inlet valve assembly
Dowel
Yoke
Screw
Washer