Model A servicing


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dnc1

I live for the CABE
Apr 1, 2016
1,759
4,504
52
Wallingford, Oxfordshire, UK
#1
Could anyone point me in the direction of servicing/set up info for the ND 'Model A' coaster hub.
Total novice needs help.
 

dnc1

I live for the CABE
Apr 1, 2016
1,759
4,504
52
Wallingford, Oxfordshire, UK
#5
I'm specifically looking for any 'how to' tips on removing sprocket from driver?
And also, which parts should be oiled? And what oil is best?
Thanks,
Darren.
 

gkeep

Finally riding a big boys bike
Jun 11, 2014
481
900
Alameda, CA
#7
I've got first hand experience removing a sharktoothed sprocket frozen onto the driver. After soaking for a couple days with liquid wrench and Kroil, heating with a propane torch a bit, I became inpatient and began tapping gently on the teeth in the direction it should go using a block of wood and a rubber mallet. Graduated to a wooden mallet. Eventually there was a crisp 'TING' and one of the teeth snapped off. That took the wind out of my sails and I berated myself for not being more patient. Reached over to adjust the driver in the vise and the sprocket was so loose I spun it off with a finger. The sacrificed tooth must have appeased the seized thread gods...

Here's my favorite view I found on someone else's overhaul page.
ND Model A Expand.jpg


And here is a nice overhaul description on the ratrodbikes site.
http://ratrodbikes.com/forum/index.php?threads/u-c-b-hub-project-new-departure-model-a.48972/.

Mine after disassembly and cleaning.
ND Mod A Expanded.jpg


ND Mod A Assmbled.jpg




Good luck,
Gary
 

dnc1

I live for the CABE
Apr 1, 2016
1,759
4,504
52
Wallingford, Oxfordshire, UK
#8
I've got first hand experience removing a sharktoothed sprocket frozen onto the driver. After soaking for a couple days with liquid wrench and Kroil, heating with a propane torch a bit, I became inpatient and began tapping gently on the teeth in the direction it should go using a block of wood and a rubber mallet. Graduated to a wooden mallet. Eventually there was a crisp 'TING' and one of the teeth snapped off. That took the wind out of my sails and I berated myself for not being more patient. Reached over to adjust the driver in the vise and the sprocket was so loose I spun it off with a finger. The sacrificed tooth must have appeased the seized thread gods...

Here's my favorite view I found on someone else's overhaul page.
View attachment 958127

And here is a nice overhaul description on the ratrodbikes site.
http://ratrodbikes.com/forum/index.php?threads/u-c-b-hub-project-new-departure-model-a.48972/.

Mine after disassembly and cleaning.
View attachment 958131

View attachment 958132



Good luck,
Gary
Thanks Gary!
The step by step process on the "ratrodbikes" site is superb, just what I was looking for.
One other question, I’m assuming that the sprocket is right-hand threaded onto the driver?
I just want to check that's correct before I resort to the torch and hammer method tomorrow.
Thanks for the lucky wishes, I may well need them.
 

Ed Minas

Finally riding a big boys bike
Jun 25, 2016
397
232
66
Farmington, United States
#10
I have rebuilt and used several model A hubs. DonChristie is absolutely correct the model A did not have the thin nuts, but based on my personal experience I always add them. Without them the cones can back off. New Departure must have discovered this back in the day because they added them on newer models they devoloped. So the nuts are not period correct but they will prevent your hub from disassembling itself. Good luck and reach out if you have questions
 

dnc1

I live for the CABE
Apr 1, 2016
1,759
4,504
52
Wallingford, Oxfordshire, UK
#12
Thanks everyone for your help.
My model A is now cleaned and degreased. Will grease and oil it finally when the replacement sprocket arrives.
No heat or mallet was required in the end!
WP_20190304_17_06_00_Pro.jpg
 

Archie Sturmer

Finally riding a big boys bike
Jun 13, 2018
443
349
Los Angeles, CA, USA
#13
So which way was it; was the sprocket right-hand threads, and the lock-ring left-hand, like an original Bendix?
Or were they the opposite.
Threads always seem 100 times tighter, when I am turning them the wrong way.
 
Last edited:
Likes: dnc1

dnc1

I live for the CABE
Apr 1, 2016
1,759
4,504
52
Wallingford, Oxfordshire, UK
#14
So which way was it; was the sprocket right-hand threads, and the lock-ring left-hand, like an original Bendix?
Or were they the opposite.
Threads always seem 100 times tighter, when I am turning them the wrong way.
Exactly that @Archie Sturmer . Sprocket was right-hand; lock ring left-hand thread.
 

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