Hammarlund PRO-310 Receiver Restoration
Page 1 - Page 2
Disassembly of the tuning mechanism
Closeup of the complex gearing that allows
two tuning rates; 1:1 AND 1.11:1
Both large split-gears were frozen and the mechanism hard to turn.
These are the two lead-screws after disassembly
and cleaning. One is for main-tuning
and the other for band-spread. Both indicator travelers were frozen in place
Here is the gearing mechanism after soaking
in solvent and then spending a little
time in a ultrasonic cleaner! It's now smooth as silk.
up of the two new drive belts installed. You can barely see the two idler
bandspread tuning under the lower spring! I can't imagine that this belt could be replaced
without a total disassembly as you see here! What a silly design! Note to anyone crazy
enough to want to restore one of these receivers: Replace both springs you see in this photo.
mechanism rebuilt and reassembled.
Completed photos ...