Craftsman 139.53973SRT Ower's Manual page 33

Care of Your Opener
LIMIT AND FORCE ADJUSTMENTS:
Repeat the safety reverse test (page 30) after any
adjustment of limits or force.
MAINTENANCE SCHEDULE
FORCE CONTROLS
9 9
1 1
7 3 7 3
5 5
KG
KG
LIMIT CONTROLS
THE REMOTE CONTROL BATTERY
WARNING
CAUTION