Makita DFT087F Repair Manual page 22

Symptom
Motor shaft rotates without abnormal
noise when Gear assembly is removed.
Motor shaft does not rotate even though
the gear section is removed.
Probable Cause
Gear assembly is broken.
Spur gear of Rotor is broken.
The remaining battery capacity is too
low.
The contacts of Battery and the
machine have dust.
The connector of Switch is not
connected.
Switch is broken.
(Broken Switch body, Connector or
Lead wires.)
Rotor is broken.
Battery is inactive, broken or its
service life has expired.
Controller is broken.
Stator is broken.
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Corrective Action
Replace broken gear(s) or Gear
assembly.
Replace Rotor.
Charge Battery.
Remove the dust.
Connect it securely.
Replace Switch.
Replace Rotor.
Replace Battery.
Replace Controller.
Replace Stator.