Drill: slow in reverse


  #1  
Old 04-17-21, 07:17 PM
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Drill: slow in reverse

Hey. I'm hoping someone might have some insight into what's going on with my Hitachi hammer drill. This is one from the Made in Ireland era.

It's served me well for years without missing a beat. I lent it out recently. Today was the first time using it since I got it back. I put some holes in cinderblock for anchors. I flipped it into reverse and found that it was moving really slow and I could actually hold the chuck and prevent it from turning. The weird thing is that in forward it spins with full power and speed.

Check out this video. Any idea what's going on with this thing?

https://streamable.com/pgvbub

 
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Old 04-18-21, 04:41 AM
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My guess would be the trigger or speed control module.
 
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Old 04-18-21, 09:10 AM
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According to the Hitachi specs.... that drill is operating normally.



Downloadable owners manual

 
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Old 04-18-21, 10:15 AM
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@pjmax

If I hold the chuck with my left hand I can stop the drill. I probably should have illustrated that. I mean.... Iíve got a pretty impressive grip.... but Iím not that strong
 
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Old 04-19-21, 06:35 AM
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When you grab the chuck in reverse does the motor just stop or do you hear a clicking or grinding like it's skipping gears?
 
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Old 04-19-21, 08:48 AM
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@Pilot Dane

No sound of gears skipping. Just seems like a stuck, underpowered motor

Have a look here

https://streamable.com/kw2vtr
 
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Old 04-19-21, 10:03 AM
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I still think it's in the trigger or speed control. I had a similar issue with a Dewalt and the trigger & speed control were sold together as one (expensive) replacement component.
 
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Old 04-19-21, 10:32 AM
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I think youíre right but it confuses me because I thought the speed was governed by the same speed control weather in forward or reverse.

The switches arenít cheap so Iím trying to avoid buying the wrong part
 
 

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