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I have a Hitachi cordless drill that will not run with a…

Customer Question
I have a Hitachi...

I have a Hitachi cordless drill that will not run with a fully charged battery.

Mechanic's Assistant: Can you guesstimate how old your Hitachi is? And just to clarify, what's the exact model?

It will turn only a few turns when pulling the trigger. Model #DS 18DSAL 18V

Mechanic's Assistant: How long has this been going on? What troubleshooting have you tried?

It started doing this a few weeks ago and has gotten progressively worse. I have not tried any troubleshooting yet. The battery works fine on my flashlight, but the drill only stutters (turns a 1/2 turn). After repeated trigger pulls it will sometimes work and spin at full speed.

Mechanic's Assistant: Anything else you want the Electronics Expert to know before I connect you?

No thats it.

Submitted: 11 months ago.Category: Small Engine
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Customer reply replied 11 months ago
I just checked the carbon brushes and both are not worn. They still are about .4" long. My drill is about 3 years old.
Answered in 4 hours by:
9/13/2017
Technician: JON, Small Engine Technician replied 11 months ago
JON
JON, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1,877
Experience: Certified Small Engine Technician
Verified
Do you have a backup battery you can test with the drill also to see if it does it with both batteries?
Sounds like the motor is going out in the drill since the flashlight will operate as normal with the same battery that will not operate the drill.
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Customer reply replied 11 months ago
I tried the backup battery. Same result. Drill motor only turns 1-2 turns when pushing the trigger. Flashlight works fine.
Technician: JON, Small Engine Technician replied 11 months ago

I would say the motor in the drill has gone bad then.

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Technician: JON, Small Engine Technician replied 11 months ago

You can check all the electrical connections inside the drill to make sure no solder has come loose from a circuit

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Customer reply replied 11 months ago
OK. I just opened it up. There's some dust & dirt in there I cleaned off. Solder connections look good.
Technician: JON, Small Engine Technician replied 11 months ago

s​ounds like the issue is in the motor itself then nd would need to be replaced

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