Troubleshooting - YAMADA 140 Series Instruction Manual

4.2 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),
- packings are damaged, or
Material cannot be
- shovel rod is bent.
pumped out
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.
Internal diameter of drum is larger than specified.
Material contains
Air release plug is loosened.
air bubbles even
Packing of inductor plate is deteriorated.
after bleeding
- Fasteners are loosened.
- O ring or backup ring is damaged.
Internal diameter of drum is larger than specified.
Material leak
around inductor
Drum surface is uneven.
plate
Packing of inductor plate is deteriorated.
Compressor is off.
Air supply is off.
Valve on air piping is closed.
Air pressure setting is not enough.
Lift doesn't move
up/down
Drum surface is uneven.
Cylindrical section of lift air cylinder is dent.
Foreign object is caught in sliding part of lift.
Foreign object is caught in slider roller of lift rail.
Drum raises
Lift control switch is adjusted to "UP".
together with lift
Lift control switch is adjusted to "STOP".
Lift doesn't raise
with AIR button
Air release plug on inductor plate is not secured.
POSSIBLE CAUSE
11
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 worn part.
Set pump speed to 5-8 sec. per cycle
until material is pumped out.
- Remove foreign object.
- Replace worn 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 loosened parts.
- Replace damaged part.
- Retighten loosened parts.
- Replace damaged part.
Use the drums described in the
"6.Specifications".
Secure air release plug.
Replace packing.
- Retighten loosened parts.
- Replace damaged part.
Use the drums described in the
"6.Specifications".
Use straight side drum.
Replace packing.
Turn on compressor.
Turn on air supply.
Open valve.
Set air pressure to 0.4MPa.
Use straight side drum.
Replace part.
Remove foreign object.
Adjust switch to "DOWN".
Adjust switch to "DOWN".
Tighten air release plug.