1995 Questions for all other cars Gears grind

Transmission problem
1995 Questions for all other cars 4 cyl Front Wheel Drive Manual 1500 h miles

Replaced a clutch, pressure plate, throw out bearing in a forklift. Gears grind when attempting to put it in gear. Adjusted the clutch little-by-little untill there was no more pressure to the flywheel. If I adjust the clutch enough to stop the grinding there isn't enough pressure to move the vehicle. When I back it off enough to get pressure to the flywheel the gears grind. What am I doing wrong?