Troubleshooting - YAMADA 40 Series Instruction

5.2 Troubleshooting

If you suspect that you have a problem with your product, consult the table below for some common problems
and their solutions. Contact the retail store where you purchased your product or our business office if all else
fails.
PROBLEM
Compressor is off.
Valve on air piping is closed.
Air pressure setting is under 0.2MPa.
Valve on material outlet is closed.
Frost occurs inside silencer.
Pump doesn't run
O ring on sliding part of air piston is worn out.
(Air leak occurs from silencer.)
Block (773210) and ball (686271) in valve body (804815) are worn out.
Any parts (e.g. spring, pin) used in switching system in valve body (804815) or
air motor (804814 / 804856) are damaged.
Air leak from air - Fasteners are loose.
motor - O rings and packings are worn out.
Air leak from - Foreign object is caught between block (773210) and valve seat (716246) in
silencer during valve body (804815).
shutdown - Seating part is worn out.
Pump doesn't run - Foreign object is caught between spindle (716299) and valve switcher
and air leaks from (832996) in air motor (804814 / 804856).
silencer - There exists damage that prevents sliding movement of parts below.
Pump doesn't draw
Pump operating speed is so fast that lower pump suction cannot keep up with
material at first time
pump movement. (Valve inside lower pump is not working well.)
of operation
If upward movement of plunger is faster,
- seat surface of piston valve is defective (wear of seat surface, inclusion of
foreign material) or,
- packings are damaged.
If downward movement of plunger is faster,
- seat surface of foot valve is defective (wear of seat surface, inclusion of foreign
material),
Material cannot be
- packings are damaged, or
pumped out
- shovel rod is bent.
If downward movement of plunger is faster, operating speed is so fast that lower
pump suction cannot keep up with pump movement. (Vacuum is caused inside
lower pump.)
Connecting rod connecting air motor and lower pump is completely separated
from air motor. (In this case, parts inside of lower pump may be damaged.)
Leak occurs in delivery pipe.
Pump doesn't stop
Leak occurs in lower pump (connections are loosened or o ring, backup ring, or
packing is damaged).
Material leak from - Fasteners are loose.
lower pump - O ring, backup ring or packing is damaged.
Material contains
- Fasteners are loosened.
air bubbles even
- O ring or backup ring is damaged.
after bleeding
POSSIBLE CAUSE
8
REMEDY
Turn on compressor.
Open valve.
Set air pressure to 0.2MPa or above.
Open valve.
Use dry air.
Replace worn out or damaged part.
- Retighten loose parts.
- Replace worn part.
- Remove foreign object.
- Replace worn part.
- Remove foreign object.
- Replace damaged part.
Set pump speed to 5-8 sec. per cycle until
material is pumped out.
- Remove foreign object.
- Replace damaged part.
Decrease air pressure until material
comes out. (This pressure is the upper
limit of normal operating pressure.)
Inspect inside lower pump first, then
replace damaged part, and retighten each
part.
- Retighten loose parts.
- Replace damaged part.
- Retighten loosened parts.
- Replace damaged part.
- Retighten loosened parts.
- Replace damaged part.