I have a minolta rotomatic slide projector made by Sawyer. Its 50 years old. It still works, however after its been on for a bit the changer becomes sluggish and requires manual operation...

747AQ? what model, many made. 737?
600?
that projector is old what if the old plastic is deformed.
surely the drive runs dry, any oil or grease only gets stiff and overloads the drive.
I took all my slides back to 1969 (even vietnam) and using digitizer did that, no more slides here,well, packed deep in the attic.
but only had 100s. here.

is that the drive device a SOLENOID.
and it gets hotter , weaker, (physics that)
make sure it is fully clean.
what if the solenoid iron core when rusty.
remove it and look>? if did and gets hot it would bind up. 50years,old, what if stored in a basement and parts rusted, any grease that old turns to glue or worse, look for that too.
I had one and hated it, got KodaK carousel
it love to jam and could never learn why and I am gear head.
IIRC it only liked perfect slides, no fuzzy edges.
if I was serious in this , id get the service manual and they have 2, one for parts
oil if must Id use silicon spray oil. super light.
to lubo or run dry
all bearings shafts and motor lube
other thing must be kept dry and clean.
on some the carousels were warped, in hot attic stored.
grease put on things not to grease gather dust and dirt then jam,..
I could not find one manual online, (50years old ,lost in the sands of time) 747AQ? what model, many made. 737? 600? that projector is old what if the old plastic is deformed. surely the drive runs dry, any oil or grease only gets stiff and overloads the drive. I took all my slides back to 1969 (even vietnam) and using digitizer did that, no more slides here,well, packed deep in the attic. but only had 100s. here. is that the drive device a SOLENOID. and it gets hotter , weaker, (physics that) make sure it is fully clean. what if the solenoid iron core when rusty. remove it and look>? if did and gets hot it would bind up. 50years,old, what if stored in a basement and parts rusted, any grease that old turns to glue or worse, look for that too. I had one and hated it, got KodaK carousel it love to jam and could never learn why and I am gear head. IIRC it only liked perfect slides, no fuzzy edges. if I was serious in this , id get the service manual and they have 2, one for parts oil if must Id use silicon spray oil. super light. to lubo or run dry all bearings shafts and motor lube other thing must be kept dry and clean. on some the carousels were warped, in hot attic stored. grease put on things not to grease gather dust and dirt then jam,.. I could not find one manual online, (50years old ,lost in the sands of time)