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Fluid Section Seal Replacement Instructions
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.
WARNING
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 9140S, 9146, and 9150, 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 9170 and 9190, 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 briefly 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 flat 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)
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
w
rench. 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 a lithum grease 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. The
inlet valve may need to be removed again to move the
piston.
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.
Kit Part Number 0512228A (9140S, 9146, 9150) Kit Part Number 0516725 (9170, 9190)
Insertion
tool
0516724 Kit
(9170, 9190)
0512228A Kit
(9140S, 9146
and 9150)
Top seal
(cup down)
Top nut
0516724 Kit
(9170, 9190)
0512228A Kit
(9140S, 9146
and 9150)
Piston/seal
assembly
O-ring
CAUTION! DO NOT
attempt to remove the
seals from the piston.
Inlet valve assembly
0516292 (9140S,9146, 9150)
0516296 (9170, 9190)
Dowel
Yoke
Screw
Washer