How to open a DD hub motor WITHOUT puller

[NeilP]

Been meaning to film this for a while now. Saves having to write it up each times someone asks.

At the end of the video I mention using an axle extension to make aligning the side cover and rotor easier before re assembly.

something like this ..even do it in wood





[youtube]g-pcvtl73fo[/youtube]

 

[cal3thousand]

Nice video! Very well done. I think it might come in use for some folks without pullers.

I don't have an impact screwdriver, but I have a method for removing the screws without one. I saw Illia do it on a BMC motor video. Basically you need a screwdriver that has uses a hex shank bit that is about an inch long. Then you slip a 1/4" closed end wrench over the shank. While pushing down on the screwdriver, you turn the bit using the wrench. This keeps the downward force high and keeps the bit in the groves.

 

[skeetab5780]

Ya thx for the video. I Learned a few simple tricks this mornin'

 

[100volts+]

Subscribed

 

[NeilP]

Hope it helps...will certainly stop me having to type up the description all the time !

Put it on the Wiki too.

If you are doing the hex bit screwdriver method for removing tight screws...or even with any old screwdriver..if you do not have an impact driver...just hit the screwdriver or hex bit direct with hammer while turning. Done that many times myself when no access to impact driver..does the same job

 

[Cowardlyduck]

Yeah, perfect timing on this one...one of my hall sensors just ripped out of it's slot today. Looks like I gotta take the side covers off without a puller...again.
In fact, after the pain from last time I decided I would just buy a puller next time...now I don't have to.

Thanks NeilP.

Cheers

 

[cwah]

I need to do this

 

[Ykick]

Excellent DIY video. Please produce more.

 

[NeilP]

Funnily enough, after doing that one, and the time it took...and seeing myself on camera..I did think never again !

 

[alsmith]

Well done.

I removed my Crystalyte 5300 covers but don't have a bench / vice so steadied the wheel on the floor but otherwise fairly similar to your video.

And +1 for the following-
I like the centre punch mark method for alignment- I had used a marker and the mark got rubbed out on one side when it came to reassembly. I'll be doing that in the next couple of days so I can't forget when it's next disassembled.

 

[NeilP]

Yes, i have done the marker method before too, and ended up in same situation.

Punching like that is pretty much standard practice when removing any mechanical parts that need same alignment when re assembling.

 

[alsmith]

I'm a time served fitter but my career went in different directions when completed. That was about 40 years ago so some of the things have to be given a nudge......

 

[Cowardlyduck]

So in my situation I previously removed the side covers without marking them.

Reassembled, they are out of balance, however I also drilled them, so I don't know if this would effect things also.

Any tips for re-balancing drilled side covers...without specialist tools?

Cheers

 

[alsmith]

So in my situation I previously removed the side covers without marking them.

Reassembled, they are out of balance, however I also drilled them, so I don't know if this would effect things also.

Any tips for re-balancing drilled side covers...without specialist tools?

Cheers

lots for motorbike wheels by doing a google search. If they balance motorbike wheels they should be fine for bike wheels. AIR worst effect of out of balance wheels was about 80mph, noticeable at 40mph, slight at 20mph so may have more effect around 20 and worse at 40 on a bike?

if it is more consistent through the speeds look for worn bearings, loose spokes etc.

When is your wheel vibration?

 

[spinningmagnets]

Well done! very useful info, Also good advice on the methods when someone doesn't have an impact driver.

 

[Ch00paKabrA]

thanks for posting this. It was very helpful.

 

[NeilP]

if you do no have a vice to clamp the axle to, to pull.
Drill a hole in a large piece of wood...countersink the hole one side, put washers and wheel nut back, then put on floor. Get others to stand on wood to hold it down..or screw it to floor then pull the rim off upwards

 

[Cowardlyduck]

if you do no have a vice to clamp the axle to, to pull.
Drill a hole in a large piece of wood...countersink the hole one side, put washers and wheel nut back, then put on floor. Get others to stand on wood to hold it down..or screw it to floor then pull the rim off upwards

Or, just not worry so much about scraping the magnets, and push the Rim down onto the floor with both side covers undone. That way the stator just pops out the top.
Worked for my HS4065 the other day...and no damage to the stator or magnets.

Cheers

 

[NeilP]

less concerned with scraping the magnets as scraping the windings ..but yes..a quick push down would work

 

[dendy]

Great!

Thank you!