When you cock it, the bolt cocks the hammer, which does take some force. cock the hammer then cycle the lever to see if it is easier.
If you are sure all the parts are there and undamaged, try a lot of oil on all the moving parts where they contact the other parts. Then work it well, (with no ammo,) slow and easy making sure nothing is broken or whatnot.
Every 6 months or so, I'll oil my Win94 very heavily. I'll wipe it down before use, as well as make sure there is no oil in the barrel or chamber before shooting.