17
MAINTENANCE & SERVICE (DC-3000)
REMOVAL OF FLUID PUMP:
1)
Turn unit off, ensure that prime valve is open, and all
pressure is relieved. Unplug unit from electrical outlet.
2)
Unscrew the suction system, fluid connection hose, and
the return hose. (make note of return hose fitting position
before loosening).
3)
Remove the front cover and pull the retaining clip from the
yoke and pin. Push the pin out of the piston and yoke. (use
the short end of a hex wrench if necessary).
4)
Loosen the locknut at the top of the fluid section and
unscrew the pump.
REMOVAL OF PUMP PACKINGS:
Note: It is recommended to replace the packings
once they have been removed to prevent possible
future damage to the piston.
5)
Hold the foot valve in a vise (contacting on the wrench
flats) and unscrew the fluid section. Unscrew the packing
nut from the fluid section.
Note: Do not allow the piston to fall or get damaged
in any way. Its finish must be perfectly smooth.
6) Push the piston out through the lower end of the fluid
section. Tap the top of the piston with a rubber mallet
if necessary.
7) Remove the upper and lower spacers from the fluid
section.
Note: When removing the packings, be careful not to
scrape or gouge the inside surface of the cylinder
with the screwdriver.
8) Push the packings out of the cylinder with a screw-
driver by pushing from the inside out (push from the
opposite end).
INSTALLING NEW PUMP PACKINGS:
9) Apply a light coat of oil to the packings. Install both
packings with the "v" edge with the spring faces into
the cylinder, the flat side facing outwards.
Installing lower packings
10) Lower packing; Insert it edge-first into the lower end
of the fluid section. Turn the packing inside the cylin-
der so that the springs of the packing face into the
cylinder. To do this, hold the lower edge of the pack-
ing in place while pressing the upper edge further into
the cylinder. Push the packing as far into the cylinder
as it will go. Insert the lower spacer.
11) Upper packing; Place it into the upper end of the
fluid section. Position the packing so that it is level and
the springs of the packing face into the cylinder.
Thread the packing nut into the cylinder to push the
packing farther into the cylinder, then remove the
packing nut. Insert the upper spacer and push it as
far into the cylinder as it will go. Screw the packing
nut into the cylinder and torque to 25 - 30 ft/lbs.
Piston
Yoke
Pin
Retaining clip
Torx screw
Front cover plate
Locknut
Packing nut
Upper spacer
Upper packing
Oulet
fitting
Cylinder
Lower packing
Lower spacer
S.V. ball guide
S.V. ball
S.V. seat
S.V. hex nut
O-ring
F.V. ball stop
F.V. ball guide
F.V. ball
F.V. seat
Seat seal
F.V. housing
Suction system
complete
main pump
housing
