As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. GEAR HANDLE WOULD NOT MOVE OUT OF DOWN POSITION. AIR TURN BACK TO ILN. REPACKED NOSE LANDING GEAR STRUT IAW DC8 MM 32-21-2 AND CHECKED LANDING CONTROL LEVER AND ANTI-RETRACTION LATCH IAW DC8 MM 32-31-1. OPS CHECKED OK.