Yokota YED-90, Manual

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The tool does not rotate under no load. The tool rotates under no load.
● Symptoms of troubles and countermeasures
Symptoms
Supposed causes
Immediately stop
using the tool.
〇 Ask your YOKOTA dealer
for repair.
Countermeasures
If there is no improvement with
above countermeasures and repair.
W
arming-up operation
Confirmation of air pressure
The repair is authorized.
Yes
Repair
No
Main shaft
rotates if it
is turned by
fingers.
Main shaft does
not rotate even
if it is turned by
fingers.
The tool
does not
stop even
after a
throttle lever
is released.
When under load
The tool
does not
work.
(No pulsing)
The oil pulse
unit slips.
Dust contamination Too low air pressure Motor part seizure Faulty assembled motor Dust contamination Damaged vane Damaged
Ball bearing
Motor part seizure Malfunction of a throttle Pulse unit seizure Damaged spring for blades Damaged knock pin of the liner Damaged spring for blades Oil leak Low T
emperature