[GreenKeys] M28 reperf print hammer head installation?

[Don Robert House K9TTY]

Hi Nick,
Someone once said "I thought you would never ask."

I have replaced many of these hammer heads on Model 28s, 35s, and one M37 Typing Reperforator.

This Spring when I get some help to get the 28ASR in my garage partially disassembled and moved to my basement I will take some photos of the procedure.

1. Do not attempt this without having some time set aside in an area without a phone and good lighting.
2. It is a bit easier if the unit is removed and sitting by itself on a work table where you can get your hands on any part of the unit you need to.
3. Make sure the unit is relatively clean and the parts all move when you turn the shaft.
4. Remove the side-plate or "cover" from the side of the punch and type wheel. 
   4a. Notice exactly where the home position is on the type wheel.
5. Set up any typing code on the transfer levers that is intended to print.
6. slowly turn the shaft until the type wheel comes out and the print hammer comes up to print.
7. Depending on which character you set up you might need to remove the type wheel at this point.
   7a. Sometimes but not always…
8. Be careful to keep from turning the shaft any further in either direction.
9. Slip the lower portion of the hammer head under the semi-T shaped hammer. The hammer heads are asymmetrical.
10. Us a standard "pull" spring hook to stretch the hammer head over the other side of the T-shaped hammer.
10a. If you pull too hard it is possible, but not probable, that you might tear the hammer head or it's substitute.
11. Put everything back together that was necessary to remove.

Call me if I can be of further assistance.

Don
K9TTY
Teletype & Data Installation and Repair 1966-1970

P.S. This is not the TTY Corp approved method but we found it to get the customer back in service faster without more disassembly and more required adjustments.





On 14 Feb 2015, at 1:26 PM, Nick England wrote:

> I've obtained some vinyl tubing to experiment with as a replacement for the Disintegrating Delrin hammer head.
> But how do you get the head onto the hammer lever buried down there in the innards??
> Is there some technique besides removing the whole side plate?....I sure hope so.
>  
> There is a lot of folkware to maintaining these gadgets - many thanks to you experienced guys for sharing your hard-won knowledge.
>  
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
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