Flex 3401 - Is this normal???

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Xcessiv

New member
8 months ago, I bought a Flex 3401 to avoid reliability issues with other models like the UDM. I was fully aware of its limitation, like its fragility when applying too much pressure on the extremities.

I think this wasn't enough because 6 months after the purchase and around 5 jobs later, what looked like a tiny plastic ring came off the plate. I ensured that the Allen bolt was tightened properly and everything was perfect. I therefore completed the job flawlessly, without a single sign of abnormal wear.

Today, 2 months after this incident, I decided to open the Flex and see what was going on to be sure that there was nothing wrong and that I'd be ready for the next jobs. The first noticeable thing before removing the plate was a very minor backlash up and down; maybe 1mm. After opening everything, here's the result:
Flex001.jpg

Flex002.jpg

Flex003.jpg


I really don't think this is normal; is it? Should I send it back? Is this typically covered by the warranty?
 
While I wouldn't consider it normal, it may not be terribly uncommon.
The 3401 is too expensive for me so I don't follow the Flex threads often, but I do think I have read some comments about heat developing in the drive assembly and causing some problems.
Seems like it was an easy fix.
Probably your best bet is to contact the people you purchased it from and see what they can/will do for you.
 
Ok, so I got the replacement parts (backing plate and ring gear).

Looking at the ring gear, what could have caused this damage?
Flex004.jpg


My warranty is ending soon. If it's a bearing, I'll try to get it replaced now.
 
I wish I could be some help to you but I've just started carrying the FLEX and just started using one.

It's working great for me and none of these issues are evident with me.:hmmm:

Looks like you might have a defective unit to me.
 
As for the rubbing, mine does it and it's never caused a problem. In fact, every other Flex I've used or seen has done it as well. I attribute it to extremely tight tolerances.

As for the hardware surface rust, some PB Blaster or WD-40 can prevent that from happening. Synthetic motor oil works well too.
 
Autogeek said:
As for the rubbing, mine does it and it's never caused a problem. In fact, every other Flex I've used or seen has done it as well. I attribute it to extremely tight tolerances.

As for the hardware surface rust, some PB Blaster or WD-40 can prevent that from happening. Synthetic motor oil works well too.
Click to expand...


Is your machine showing wear on the teeth like that? Looks like a developing problem to me.
 
A quick update!

I contacted Flex and they sent me a felt ring, ring gear and backing plate.

I was still worried about the internals so I sent the unit to a repair center in order to get the unit inspected. They changed a bearing. It looks like part 259.148 on the diagram.

I don't think they changed the needle roller bearing.
 
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