John Deere ride on mower L100 17 hp.

Quester edited for clarity and spelling 'deer' to 'Deere'.
Question moved to John Deere D110.

Try the 5 minute fix, but your sounds like the hydrostatic transmission.

https://www.google.com/search?q=John+Deere+D110+mower+stops+after+5+feet

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check belt and pulleys --if belt to loose wont turn blades to cut the grass

Here's a link to your belt diagram. Service Mower

john deere 111 mower deck belt diagram Bing images

1) NEVER adjust to where the deck wheels touch the ground. The wheels are to ride 1/4" off the ground. 2) The long lever to your left which raises & lowers the deck has 3 settings. 1- Fully back toward you which has the deck raised (called transport mode). 2- Halfway down which is the normal mowing mode (called float mode) 3- Fully away from you which sets the deck fully on the ground. This mode is ONLY used for VERY rough terrain where the deck risks getting pushed into "transport" or "full up" mode & getting stuck there. 3) On front-to-back tilt, the front should be 1/2inch lower than the back for least damage to the grass. Ok-now to adjust "cutting" height. 1) Park on a level, flat surface. 2) Pull the deck lever fully back toward you to put the deck into "transport" mode. 3) twist the "cutting" height knob (just below your seat) to the height you want the grass cut. Has choices by 1/2" increments from 1" to 3.5". The deck in "transport" mode is 4". 4) Lower the deck lever to the midway/"floating" mode point. 5) Adjust each deck wheel with its own peg & pin to have at least 1/4" clearance from ground. Thats it for "cutting height" adjustments
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call your deere dealer,
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Troubleshooting

Service Mower

cant find info for you,call dealer

Belt path for JD 100 series, 42" cutting deck, 2 blades.

they do go bad

Park mower on a level flat surface ( a concrete garage floor is ideal ) lift deck up until you can put a piece of a 2x4 flat underneath the deck and lower deck until it just contacts the 2x4. loosen adjustment nuts or turnbuckles and adjust until the deck just starts to clear the 2x4. this should level your deck. Now , lift the deck and remove the 2x4. put blade height lever on a known cut length and with a tape measure, measure the tips of the blades from the floor to the blade tip...they should all be the same within 1/8 of an inch...if not then you either have a bent blade, bent spindle shaft, or spindle bolts are loose or misaligned. Your deck could be warped too...depending on how hard a lick it took...good luck !!! ;-D

Sounds like a pully might be stuck or one of the deck spindles might be froze-up

Check to see if the belt might have come off and wedged on something under the frame. Or,,maybe a spindle could be locked-up. One more thing to check is if your deck might have a braking system on it to keep the blades from moveing it might not be disingaging.