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Trouble Probable Cause Solution
Screwdriver runs in
one direction but
not the other
Are wire leads in good condition
and properly soldered?
Defective solder connections. Resolder and rewire if necessary.
Does Reverse Switch operate properly? Defective Reverse Switch (9). Replace it.
Bit does not rotate
but motor hums.
When gears are removed, will the motor
rotate?
Armature (31) is in contact with the magnets. Replace the
motor.
Foreign material in the motor. Clean the motor.
1.
2.
Is planetary gearing smooth when bit is
rotated by hand?
Bearing has failed. Replace the Spindle Assembly (40).
Gears are worn or damaged. Replace any defective gearing.
Clutch Assembly is worn. Replace damaged or worn parts.
1.
2.
3.
Shuto brake
malfunctions more
than one index of
the Clutch.
Does the speed of the Bit exceed rated speed
by more than 100 rpm?
Motor magnet is demagnetized. Replace the motor.
Is Brake Switch functioning? (Does it click
when button is depressed and does it test
correctly with an ohmmeter?)
Defective Brake Switch (15). Replace the Brake Switch.
Does Pushrod (35 or 46) function properly? Bent or worn Pushrod (35 or 46). Replace it.1.
Does Cam (43) function properly?
Cam is worn and not providing adequate lift.
Replace the Cam.
1.
Controller malfunctioning or defective.
Repair or replace. See Controller Service Manual.
Tool makes
abnormal sounds
when the motor is
running.
Is there looseness at the assembly points?
Screws (2) are loose. Tighten all Screws.
Clutch Housing is loose. Tighten the Clutch Housing to the
proper torque.
1.
2.
After removing the gear train does motor
sound normal when running?
Armature (31) is in contact with the Magnet. Replace the
motor.
Foreign material has gotten into the motor. Clean or replace
the motor.
Ball Bearings are defective. Replace the Motor.
Armature is defective. Replace the Motor.
1.
2.
3.
4.
Is the gear train properly lubricated?
No grease on the gear train.
Apply a thin lm of the recommended grease to the gear train.
Spindle Bearing has failed.
Replace the Spindle Assembly (40).
Gears are worn or dirty. Clean or replace the Gears.
1.
2.
Tool generates
abnormal heat when
operating.
After removing the gear train, does tool cool
down and motor run normally?
Motor is defective. Replace the motor.
Planetary gears and the Clutch require lubrication.
Lubricate the Clutch and gear train with the recommended
grease. Note: Do not apply tooI much or too little grease.
Tool outputs high
torque.
Is the shuto brake functioning properly? Refer to Problem No. 4 to check shuto brake malfunctions.
Is Clutch properly lubricated?
No lubrication on the Clutch Components. Lubricate the Clutch
with recommended Grease.
Is there wear on face of cam guide where it
contacts Spindle Assembly (40)?
Cam guide is worn. Replace the Bit Holder Assembly.
Clutch Spring (51) is damaged. Replace Spring.
Tool outputs low
torque.
Is the Clutch Housing joint tight?
Loose joint between the Gear Case (37) and Clutch
Housing (53).
Tighten the joint iwth a torque wrench to specied torque.
Cam (43) is worn. Replace the Cam.
Clutch Spring (51) is damaged. Replace the Clutch Spring.
Cam guide is damaged. Replace the Bit Holder
Assembly (48).
1.
2.
3.
Related Documentation
For additional information refer to:
Product Safety Information Manual 16602963.
Product Information Manual 45527702.
Parts Information Manual 45527777.
Manuals can be downloaded from www.irtools.com.