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Home✈️Aircraft🚁HelicopterTools and Field Equipment › Dynatron Pulley Removal
05-21-2007 09:47 PM  13 years ago
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Malc1

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EVESHAM,UK

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Dynatron Pulley Removal
Anyone know how to remove the pulley on a Dynatron starter?
I`ve got a Vario extension to be fitted to the shaft and I don`t really want to damage anything.
Looks like its threadlocked and possibly a left hand thread on the shaft
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05-21-2007 09:56 PM  13 years ago
MikeSherman

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Racine, WI

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I believe it's a normal RH thread. Once you remove the nut, the hub is also threaded to the shaft. This is usually the toughest to remove.

I usually bring out the torch and heat up the hub and just reverse the dynatron to unscrew the hub. Careful not to induce too much heat into the shaft as it may damage the motor.

It would have been nice to see some wrench flat you could access.

-Mike
Team QuickUK Pilot
Team Heliproz
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05-21-2007 10:26 PM  13 years ago
Malc1

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EVESHAM,UK

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Ok thanks I`ll try again.
I did heat the hub but things wouldn`t shift.I`ll try rotating the starter while holding the nut tight with a socket wrench.See if that will loosen it.
As long as it is a right hand thread..don`t want to tighten it up more.
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05-22-2007 08:59 AM  13 years ago
pgrbff

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Piemonte, Italy

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Came off fairly easily once heated.
Trouble is, not realising it was threaded, I tried to pull mine off first and damaged the thread.
Proficient at turning cash and credit into smoke and noise!
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05-22-2007 12:06 PM  13 years ago
Azlum

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Limington, ME - USA

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Easiest way is to take the starter apart fully.

Take the acorn nuts off the back plate, then using a wrench turn out the long studs that run all the way through the motor. You can then take off the metal backplate. Pay attention to the washer thats on the starter shaft just inside of the back.

You can then slide the whole assembly out of the starter housing and you will be able to grip it enough with your hand while you turn the hub off.

It sounds scary taking your expensive starter apart, but its actually quite easy and straightforward.

Edit: Be careful when tightening up the long studs when you are re-assembling it. They are very easy to break, do not over-tighten them.
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05-22-2007 01:56 PM  13 years ago
workerant

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MN - USA

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Needle nose vise grips. Leaves small teeth marks on the shaft, but no damage. Very thin needle nose.Raptor 90, Raptor 50
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05-22-2007 01:58 PM  13 years ago
pgrbff

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Piemonte, Italy

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Just wrap cloth around shaft before using grips - no mark at all!Proficient at turning cash and credit into smoke and noise!
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