Go to the Teletype Corp Manuals Page
me email if you have hints, corrections, or a better way to do this.
Note - I have also removed the entire hammer lever and ribbon guide assembly, but think this way is easier - thanks to Tom Tillson for the pointer..
"It is a damn poor job that doesn't require at least one new tool"
If you don't have a couple of spring hooks, make or buy some - they come in handy
Crochet hooks, bent paper clips, or the real thing from Central Tools
|The M28 typing reperf (this one is chadless and has power
||View of the punch
||This is the plastic print hammer head - yours may be missing
||We will remove the punch block to get access to
remove/replace the head
|Remove two screws on each side
(a 3/16 wrench is handy)
|The backspace mechanism has a screw and a stud - you may
just have two screws on this side
||Stud and bracket removed from backspace mechanism
|The punch pins are retracted by 4 springs - you need to
detach these at their bottom ends
||Remove the punch lever guide plate and you get access to
detach the springs
||After the springs are detached you can slide the punch block
out - it fits into slots in the side plates
||Rear of the punch block showing those 4 pesky springs still
attached at the top and detached at the bottom
|The old hammer is now exposed
||I used long nosed pliers to remove the old one
||Hammer lever with no head
|Replacing the head
||It is flexible so you need to get it started and just push
||IMPORTANT - THE THICK PART OF THE HEAD FACES UP
||IMPORTANT - THE THICK PART OF THE HEAD FACES UP -
HERE'S A DIFFERENT HEAD SHOWING THIS
|Slide the punch block back in and replace the two screws on
||Re-attach the 4 punch springs
||Using the spring hook to re-attach
||Re-install the punch lever guide plate, making sure the
levers align with the punch pins
|IF you decide to remove and clean your typewheel, here are two suggestions|
|1. Make note of the wheel position.
"5" is up when at rest in LTRS mode. It rotates slightly clockwise to print the "null" symbol || .
2. To realign see adjustments below
|HINT -Wear latex gloves unless you want
permanent proof that you have removed
lots of old ink from the typewheel.
MANUALS - ADJUSTMENTS - PARTS - THEORY OF OPERATION
Adjustments - If you haven't removed the typewheel, then you should be OK.
Otherwise you may need to loosen and rotate the typewheel on
|If the hammer is off to one side and not hitting squarely, Read page 65||UNLIKELY - but if you need to move the hammer in/out a
little, you can loosen the two screws holding the bottom of the hammer
lever plus ribbon guide assembly and reposition the assembly. See photo at
ALSO NOTE - there is supposed to be a spacer in the rear of the typewheel - if that has been lost, the printing may be too far toward the edge of the tape. See Parts book page 10