5
Fig.10
Fig. 9
Fig. 8
5. Disassembly and Assembly
CAUTION
- Gasoline is a high volatile fuel. Do not use it to clean the pump in any case, otherwise ignition or
explosion may be caused.
- When washing parts, do not use such a liquid as corrodes aluminum, copper alloy, iron, etc.
- Before disassembling and inspecting the machine, be sure to shut off the power supply and open the
outlet valve to release the internal pressure of the pump.
[Disassembling the lower pump]
When the trouble such as unstable operation or pump stop, do not
disassemble the pump immediately. First refer <Troubleshooting
and Corrective Measures> on page 4 and confirm the situation of
the pump unit. Do not disassemble the part that is not concerned
with the trouble.
1) Shut off the power supply. Bleed the internal pressure of the
pump and hose and remove the air chuck and high-pressure
hose form the pump.
2) Unscrew 3 wing bolts that fix the lid and the pail, and dismount
the unit from pail.
3) Unscrew 3 pan-head screws that fix the pump and the lid, and
disassemble the lid from the pump.
4) Fix the pump assembly on vise. (Fig.6)
5) Set a spanner on the valve adapter and unscrew it. The out
tube can be pulled out from the pump. Then continue to pull
out it until touching to the plate, the union that connects to the
motor. Pull out the pin and unscrew the union, and the lower
pump can be separated from the motor. (Fig. 6)
6) Pull out the out tube. If only the valve adapter pulled out,
unscrew the nut and remove the plate. Then pull out the out
tube and screw the suction tube with pipe wrench (set on
notched part of the suction tube). Pull out the pin and unscrew
the union, and the lower pump can be separated from the motor.
(Fig. 6, 7)
7) Fix the cylinder part of the lower pump on vise. Set a spanner
on the valve adapter and unscrew it. The valve seat, the foot
valve and the valve ring can be removed. (Fig. 8)
8) Set a pipe wrench on notched part of the suction tube and
unscrew it. The piston valve assembly can be removed.
(Fig. 9)
9) Flatten the bending part of the washer that fixes the union and
the piston. Separate the union and the piston with a spanner,
and then remove the ball and the spring. (Fig. 9)
10) Wash each part and if damage and wear found, change to the
new parts. Especially if the metal seal parts are damaged or
wear out, grease will leak and discharge pressure cannot be
increased, and consequently discharge volume will be
decreased. In this case the piston and the cylinder must be
changed to the new parts simultaneously. (Fig.10)
Fig.7
Fig.6
