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 the pliers, pull the dowel pin out.
5a. For models K2015 and K20155 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 K3017 and K4019, 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 using an
adjustable wrench.
7. Remove the piston assembly by pushing down on the
piston near the yoke.
8. Uscrew 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 Amspray Separating Oil
(P/N 0154908) or light household oil and by hand place the
seal (cup side of seal down) into the top port of the housing.
2. 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. Place the two (2) large O-
rings over the new plastic bottom seal, lubricate similar to
the top seal, and place the bottom seal with O-rings into
the bottom (inlet) of housing by hand. Insert the inlet valve
and thread into position to properly seat the seal.
Remove inlet and go to step four (4).
4. Push the new piston into the bottom (inlet) of the housing
and align with the yoke. A ruber mallet may be used. Be
careful not to damage the piston.
5. Install the dowel pin to connect the yoke to the piston.
The piston may have to be moved up or down to do this.
6. Install the yoke screw and washer to secure the dowel pin.
7. Install the new O-ring on the inlet assembly, lubricate,
thread into the bottom (inlet) of the housing, and tighten
with an adjustable wrench. This will drive the bottom seal
into the correct position.
8. Turn pump right side up and apply a few drops of
Amspray Separating Oil or light household oil between the
top nut and piston. This will prolong the seal life.
9. Install front cover and four (4) screws.
10. Install the suction set.
