Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
What is the full model number of the mower? The(latch) is the lever on the deck, with the tension spring. When you move the cable/spring , the lever on the deck is supposed to latch in position. Spring may be weak, or the lever bent. or belt length can be wrong, not letting lever move far enough to latch.
Page 24 and 25 in the manual above shows the springs involved. Are thee in place and the lever with idler moving?